Render sidebar sections with outline groups

.gitignore

@@ -18,3 +18,6 @@ xcuserdata/
 
 # Swift Package Manager local state
 .swiftpm/
+
+# Example data
+exampledata/

World Manager for Minecraft/Models/Content/LibraryIndex.swift

@@ -152,7 +152,7 @@ nonisolated struct CollectionSnapshot: Identifiable, Hashable, Sendable, Codable
     let childDirectoryCount: Int
     let fingerprint: String
 
-    var id: String { folderName }
+    var id: String { "\(folderName)::\(fingerprint)" }
 }
 
 nonisolated struct SourceSnapshot: Hashable, Sendable, Codable {

World Manager for Minecraft/Models/Content/MinecraftContentItem.swift

@@ -3,6 +3,47 @@
 
 import Foundation
 
+typealias PlatformProviderID = String
+
+nonisolated enum MinecraftEdition: String, CaseIterable, Hashable, Sendable, Codable {
+    case bedrock
+    case java
+}
+
+nonisolated enum MinecraftContentKind: String, CaseIterable, Hashable, Sendable, Codable {
+    case world
+    case behaviorPack
+    case resourcePack
+    case dataPack
+    case skinPack
+    case worldTemplate
+    case shaderPack
+    case mod
+}
+
+nonisolated enum JavaContentType: String, CaseIterable, Hashable, Sendable, Codable {
+    case world = "Java World"
+    case resourcePack = "Java Resource Pack"
+    case dataPack = "Java Data Pack"
+    case shaderPack = "Java Shader Pack"
+    case mod = "Java Mod"
+
+    nonisolated var kind: MinecraftContentKind {
+        switch self {
+        case .world:
+            return .world
+        case .resourcePack:
+            return .resourcePack
+        case .dataPack:
+            return .dataPack
+        case .shaderPack:
+            return .shaderPack
+        case .mod:
+            return .mod
+        }
+    }
+}
+
 nonisolated enum MinecraftContentType: String, CaseIterable, Hashable, Sendable, Codable {
     case world = "World"
     case behaviorPack = "Behavior Pack"
@@ -25,6 +66,21 @@ nonisolated enum MinecraftContentType: String, CaseIterable, Hashable, Sendable,
         }
     }
 
+    nonisolated var kind: MinecraftContentKind {
+        switch self {
+        case .world:
+            return .world
+        case .behaviorPack:
+            return .behaviorPack
+        case .resourcePack:
+            return .resourcePack
+        case .skinPack:
+            return .skinPack
+        case .worldTemplate:
+            return .worldTemplate
+        }
+    }
+
     nonisolated var archiveExtension: String {
         switch self {
         case .world:
@@ -52,6 +108,71 @@ nonisolated enum MinecraftContentType: String, CaseIterable, Hashable, Sendable,
     }
 }
 
+nonisolated enum MinecraftPlatformContentType: Hashable, Sendable, Codable {
+    case bedrock(MinecraftContentType)
+    case java(JavaContentType)
+
+    nonisolated var edition: MinecraftEdition {
+        switch self {
+        case .bedrock:
+            return .bedrock
+        case .java:
+            return .java
+        }
+    }
+
+    nonisolated var kind: MinecraftContentKind {
+        switch self {
+        case .bedrock(let contentType):
+            return contentType.kind
+        case .java(let contentType):
+            return contentType.kind
+        }
+    }
+
+    nonisolated var displayName: String {
+        switch self {
+        case .bedrock(let contentType):
+            return contentType.rawValue
+        case .java(let contentType):
+            return contentType.rawValue
+        }
+    }
+}
+
+nonisolated struct ContentItemCapabilities: Hashable, Sendable, Codable {
+    var canRevealNativeContent: Bool
+    var canExportPortablePackage: Bool
+    var canShare: Bool
+    var portablePackageExtension: String?
+
+    nonisolated static func bedrock(contentType: MinecraftContentType) -> ContentItemCapabilities {
+        ContentItemCapabilities(
+            canRevealNativeContent: true,
+            canExportPortablePackage: true,
+            canShare: true,
+            portablePackageExtension: contentType.archiveExtension
+        )
+    }
+
+    nonisolated static func java(contentType: JavaContentType) -> ContentItemCapabilities {
+        let extensionName: String?
+        switch contentType {
+        case .world, .resourcePack, .dataPack, .shaderPack:
+            extensionName = "zip"
+        case .mod:
+            extensionName = "jar"
+        }
+
+        return ContentItemCapabilities(
+            canRevealNativeContent: true,
+            canExportPortablePackage: true,
+            canShare: true,
+            portablePackageExtension: extensionName
+        )
+    }
+}
+
 nonisolated enum PackSource: String, Hashable, Sendable, Codable {
     case referencedByWorld
     case embeddedInWorld
@@ -113,11 +234,77 @@ nonisolated struct PackMetadataDetails: Hashable, Sendable, Codable {
     var minimumEngineVersion: String?
 }
 
+nonisolated enum PlatformContentMetadata: Hashable, Sendable, Codable {
+    case bedrock(BedrockContentMetadata)
+    case java(JavaContentMetadata)
+    case none
+}
+
+nonisolated struct BedrockContentMetadata: Hashable, Sendable, Codable {
+    var world: WorldMetadata?
+    var packUUID: String?
+    var packVersion: String?
+    var packDetails: PackMetadataDetails?
+    var packReferences: [ContentPackReference]
+
+    nonisolated init(
+        world: WorldMetadata? = nil,
+        packUUID: String? = nil,
+        packVersion: String? = nil,
+        packDetails: PackMetadataDetails? = nil,
+        packReferences: [ContentPackReference] = []
+    ) {
+        self.world = world
+        self.packUUID = packUUID?.lowercased()
+        self.packVersion = packVersion
+        self.packDetails = packDetails
+        self.packReferences = packReferences
+    }
+}
+
+nonisolated struct JavaContentMetadata: Hashable, Sendable, Codable {
+    var world: JavaWorldMetadata?
+    var pack: JavaPackMetadata?
+    var dataPacks: [JavaPackReference]
+
+    nonisolated init(
+        world: JavaWorldMetadata? = nil,
+        pack: JavaPackMetadata? = nil,
+        dataPacks: [JavaPackReference] = []
+    ) {
+        self.world = world
+        self.pack = pack
+        self.dataPacks = dataPacks
+    }
+}
+
+nonisolated struct JavaWorldMetadata: Hashable, Sendable, Codable {
+    var dataVersion: String?
+    var gameMode: String?
+    var difficulty: String?
+    var seed: String?
+    var lastPlayedDate: Date?
+}
+
+nonisolated struct JavaPackMetadata: Hashable, Sendable, Codable {
+    var packFormat: Int?
+    var description: String?
+}
+
+nonisolated struct JavaPackReference: Identifiable, Hashable, Sendable, Codable {
+    let id: String
+    var name: String
+    var pathHint: String?
+}
+
 nonisolated struct MinecraftContentItem: Identifiable, Hashable, Sendable, Codable {
     let id: URL
     let folderURL: URL
     let folderName: String
     let contentType: MinecraftContentType
+    let sourceEdition: MinecraftEdition
+    let contentKind: MinecraftContentKind
+    let platformType: MinecraftPlatformContentType
     let collectionRootURL: URL
     var displayName: String
     var iconURL: URL?
@@ -125,11 +312,23 @@ nonisolated struct MinecraftContentItem: Identifiable, Hashable, Sendable, Codab
     var lastPlayedDate: Date?
     var modifiedDate: Date?
     var sizeBytes: Int64?
-    var packUUID: String?
-    var packVersion: String?
-    var packMetadataDetails: PackMetadataDetails?
-    var packReferences: [ContentPackReference]
-    var worldMetadata: WorldMetadata?
+    var capabilities: ContentItemCapabilities
+    var platformMetadata: PlatformContentMetadata
+    var packUUID: String? {
+        didSet { syncBedrockMetadataFromCompatibilityFields() }
+    }
+    var packVersion: String? {
+        didSet { syncBedrockMetadataFromCompatibilityFields() }
+    }
+    var packMetadataDetails: PackMetadataDetails? {
+        didSet { syncBedrockMetadataFromCompatibilityFields() }
+    }
+    var packReferences: [ContentPackReference] {
+        didSet { syncBedrockMetadataFromCompatibilityFields() }
+    }
+    var worldMetadata: WorldMetadata? {
+        didSet { syncBedrockMetadataFromCompatibilityFields() }
+    }
     var metadataLoaded: Bool
     var previewLoaded: Bool
     var sizeLoaded: Bool
@@ -138,6 +337,9 @@ nonisolated struct MinecraftContentItem: Identifiable, Hashable, Sendable, Codab
         folderURL: URL,
         folderName: String,
         contentType: MinecraftContentType,
+        sourceEdition: MinecraftEdition? = nil,
+        contentKind: MinecraftContentKind? = nil,
+        platformType: MinecraftPlatformContentType? = nil,
         collectionRootURL: URL,
         displayName: String? = nil,
         iconURL: URL? = nil,
@@ -145,6 +347,8 @@ nonisolated struct MinecraftContentItem: Identifiable, Hashable, Sendable, Codab
         lastPlayedDate: Date? = nil,
         modifiedDate: Date? = nil,
         sizeBytes: Int64? = nil,
+        capabilities: ContentItemCapabilities? = nil,
+        platformMetadata: PlatformContentMetadata? = nil,
         packUUID: String? = nil,
         packVersion: String? = nil,
         packMetadataDetails: PackMetadataDetails? = nil,
@@ -158,6 +362,9 @@ nonisolated struct MinecraftContentItem: Identifiable, Hashable, Sendable, Codab
         self.folderURL = folderURL
         self.folderName = folderName
         self.contentType = contentType
+        self.sourceEdition = sourceEdition ?? .bedrock
+        self.contentKind = contentKind ?? contentType.kind
+        self.platformType = platformType ?? .bedrock(contentType)
         self.collectionRootURL = collectionRootURL
         self.displayName = displayName ?? folderName
         self.iconURL = iconURL
@@ -165,6 +372,16 @@ nonisolated struct MinecraftContentItem: Identifiable, Hashable, Sendable, Codab
         self.lastPlayedDate = lastPlayedDate
         self.modifiedDate = modifiedDate
         self.sizeBytes = sizeBytes
+        self.capabilities = capabilities ?? .bedrock(contentType: contentType)
+        self.platformMetadata = platformMetadata ?? .bedrock(
+            BedrockContentMetadata(
+                world: worldMetadata,
+                packUUID: packUUID,
+                packVersion: packVersion,
+                packDetails: packMetadataDetails,
+                packReferences: packReferences
+            )
+        )
         self.packUUID = packUUID?.lowercased()
         self.packVersion = packVersion
         self.packMetadataDetails = packMetadataDetails
@@ -175,6 +392,22 @@ nonisolated struct MinecraftContentItem: Identifiable, Hashable, Sendable, Codab
         self.sizeLoaded = sizeLoaded
     }
 
+    nonisolated mutating private func syncBedrockMetadataFromCompatibilityFields() {
+        guard sourceEdition == .bedrock else {
+            return
+        }
+
+        platformMetadata = .bedrock(
+            BedrockContentMetadata(
+                world: worldMetadata,
+                packUUID: packUUID,
+                packVersion: packVersion,
+                packDetails: packMetadataDetails,
+                packReferences: packReferences
+            )
+        )
+    }
+
     nonisolated var folderID: String {
         folderName
     }

World Manager for Minecraft/Models/Sources/MinecraftSource.swift

@@ -6,14 +6,18 @@ import Foundation
 nonisolated struct MinecraftSource: Identifiable, Hashable, Sendable {
     let id: URL
     let folderURL: URL
+    var edition: MinecraftEdition
+    var providerID: PlatformProviderID
     var origin: MinecraftSourceOrigin
     var accessDescriptor: SourceAccessDescriptor
+    var accessStatus: SourceAccessStatus
     var availability: SourceAvailability
     var capabilities: SourceCapabilities
     var bookmarkData: Data?
     var displayName: String
     var displayItems: [MinecraftContentItem]
     var displayItemCountsByType: [MinecraftContentType: Int]
+    var displayItemCountsByKind: [MinecraftContentKind: Int]
     var rawItems: [MinecraftContentItem]
     var logicalPacks: [LogicalPack]
     var logicalWorlds: [LogicalWorld]
@@ -47,18 +51,22 @@ nonisolated struct MinecraftSource: Identifiable, Hashable, Sendable {
         let resolvedOrigin = origin ?? .localFolder(bookmarkData: bookmarkData)
         self.id = normalizedSourceURL(sourceID ?? normalizedFolderURL)
         self.folderURL = normalizedFolderURL
+        self.edition = resolvedOrigin.defaultEdition
+        self.providerID = resolvedOrigin.defaultAccessorIdentifier
         self.origin = resolvedOrigin
         self.accessDescriptor = accessDescriptor ?? SourceAccessDescriptor(
             accessorIdentifier: resolvedOrigin.defaultAccessorIdentifier,
             kind: resolvedOrigin.kind,
             refreshStrategy: resolvedOrigin.defaultRefreshStrategy
         )
+        self.accessStatus = resolvedOrigin.defaultAccessStatus(displayName: normalizedFolderURL.lastPathComponent)
         self.availability = availability
         self.capabilities = resolvedOrigin.defaultCapabilities
         self.bookmarkData = bookmarkData
         self.displayName = normalizedFolderURL.lastPathComponent
         self.displayItems = []
         self.displayItemCountsByType = [:]
+        self.displayItemCountsByKind = [:]
         self.rawItems = []
         self.logicalPacks = []
         self.logicalWorlds = []
@@ -107,6 +115,8 @@ nonisolated struct MinecraftSource: Identifiable, Hashable, Sendable {
         }
 
         switch selection {
+        case .sourceCandidate, .connectedDevice:
+            return []
         case .source(let sourceID), .allContent(let sourceID):
             guard sourceID == id else {
                 return []
@@ -117,6 +127,11 @@ nonisolated struct MinecraftSource: Identifiable, Hashable, Sendable {
                 return []
             }
             return items(for: contentType)
+        case .contentKind(let sourceID, let contentKind):
+            guard sourceID == id else {
+                return []
+            }
+            return displayItems.filter { $0.contentKind == contentKind }
         }
     }
 

World Manager for Minecraft/Models/Sources/SourceOrigin.swift

@@ -45,20 +45,32 @@ nonisolated enum DeviceContainerAccessMode: String, Hashable, Sendable, Codable
 
 nonisolated enum MinecraftSourceOrigin: Hashable, Sendable, Codable {
     case localFolder(bookmarkData: Data?)
+    case javaLocalFolder(bookmarkData: Data?)
     case connectedDevice(device: ConnectedDevice, container: DeviceAppContainer)
 
     nonisolated var defaultAccessorIdentifier: SourceAccessorIdentifier {
         switch self {
         case .localFolder:
             return LocalFolderSourceAccess().accessorIdentifier
+        case .javaLocalFolder:
+            return JavaLocalFolderSourceAccess().accessorIdentifier
         case .connectedDevice:
             return AppleMobileDeviceSourceAccess().accessorIdentifier
         }
     }
 
+    nonisolated var defaultEdition: MinecraftEdition {
+        switch self {
+        case .localFolder, .connectedDevice:
+            return .bedrock
+        case .javaLocalFolder:
+            return .java
+        }
+    }
+
     nonisolated var kind: MinecraftSourceKind {
         switch self {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             return .localFolder
         case .connectedDevice:
             return .connectedDevice
@@ -67,7 +79,7 @@ nonisolated enum MinecraftSourceOrigin: Hashable, Sendable, Codable {
 
     nonisolated var defaultRefreshStrategy: SourceRefreshStrategy {
         switch self {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             return .eagerFullScan
         case .connectedDevice:
             return .staged
@@ -76,12 +88,35 @@ nonisolated enum MinecraftSourceOrigin: Hashable, Sendable, Codable {
 
     nonisolated var defaultCapabilities: SourceCapabilities {
         switch self {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             return .localFolder
         case .connectedDevice:
             return .connectedDevice
         }
     }
+
+    nonisolated func defaultAccessStatus(displayName: String) -> SourceAccessStatus {
+        switch self {
+        case .localFolder(let bookmarkData), .javaLocalFolder(let bookmarkData):
+            return SourceAccessStatus(
+                availability: .unknown,
+                mode: bookmarkData == nil ? .localFileSystem : .securityScopedLocalFolder,
+                displayName: displayName,
+                iconSystemName: "folder",
+                statusText: nil,
+                warningText: nil
+            )
+        case .connectedDevice(let device, _):
+            return SourceAccessStatus(
+                availability: .unknown,
+                mode: device.connection == .usb ? .usbDevice : .networkDevice,
+                displayName: displayName,
+                iconSystemName: "iphone.gen3",
+                statusText: nil,
+                warningText: nil
+            )
+        }
+    }
 }
 
 nonisolated enum MinecraftSourceKind: String, Hashable, Sendable, Codable {

World Manager for Minecraft/Models/Sources/SourceRecord.swift

@@ -24,6 +24,114 @@ nonisolated struct SourceAccessDescriptor: Hashable, Sendable, Codable {
     var refreshStrategy: SourceRefreshStrategy
 }
 
+nonisolated enum SourceAccessMode: String, Hashable, Sendable, Codable {
+    case localFileSystem
+    case securityScopedLocalFolder
+    case usbDevice
+    case networkDevice
+    case archive
+    case unknown
+}
+
+nonisolated struct SourceAccessStatus: Hashable, Sendable, Codable {
+    var availability: SourceAvailability
+    var mode: SourceAccessMode
+    var displayName: String
+    var iconSystemName: String
+    var statusText: String?
+    var warningText: String?
+}
+
+nonisolated enum SourceProbeConfidence: Int, Comparable, Hashable, Sendable, Codable {
+    case none = 0
+    case weak = 25
+    case medium = 50
+    case strong = 75
+    case exact = 100
+
+    static func < (lhs: SourceProbeConfidence, rhs: SourceProbeConfidence) -> Bool {
+        lhs.rawValue < rhs.rawValue
+    }
+}
+
+nonisolated struct SourceProbeResult: Hashable, Sendable {
+    let providerID: PlatformProviderID
+    let edition: MinecraftEdition
+    let confidence: SourceProbeConfidence
+    let sourceRootURL: URL
+    let displayName: String
+    let detectedKinds: Set<MinecraftContentKind>
+    let warnings: [String]
+}
+
+nonisolated struct SourceCandidate: Identifiable, Hashable, Sendable {
+    var providerID: PlatformProviderID
+    var edition: MinecraftEdition
+    var sourceRootURL: URL
+    var displayName: String
+    var confidence: SourceProbeConfidence
+    var reason: String
+    var detectedKinds: Set<MinecraftContentKind>
+
+    var id: String {
+        [
+            providerID,
+            sourceIdentityKey(for: sourceRootURL)
+        ].joined(separator: "::")
+    }
+}
+
+nonisolated func sourceIdentityKey(for url: URL) -> String {
+    if url.isFileURL {
+        return url.standardizedFileURL.resolvingSymlinksInPath().path.lowercased()
+    }
+
+    return url.standardized.absoluteString.lowercased()
+}
+
+nonisolated enum WorkStageState: String, Hashable, Sendable, Codable {
+    case pending
+    case running
+    case succeeded
+    case failed
+    case skipped
+    case cancelled
+}
+
+nonisolated enum WorkProgress: Hashable, Sendable, Codable {
+    case indeterminate
+    case fraction(Double)
+    case count(completed: Int, total: Int?)
+}
+
+nonisolated struct WorkStage: Identifiable, Hashable, Sendable, Codable {
+    let id: String
+    var title: String
+    var detail: String?
+    var state: WorkStageState
+    var progress: WorkProgress
+}
+
+nonisolated struct ProviderWarning: Identifiable, Hashable, Sendable, Codable {
+    let id: String
+    var message: String
+    var detail: String?
+}
+
+nonisolated enum ProviderEvent: Sendable {
+    case accessStatusChanged(SourceAccessStatus)
+    case stageUpdated(WorkStage)
+    case discovered(MinecraftContentItem)
+    case inspected(MinecraftContentItem)
+    case warning(ProviderWarning)
+}
+
+nonisolated enum SourceCandidateEvent: Sendable {
+    case stageUpdated(WorkStage)
+    case candidate(SourceCandidate)
+    case warning(ProviderWarning)
+}
+
 nonisolated struct SourceRecord: Identifiable, Hashable, Sendable, Codable {
     let id: URL
     var displayName: String

World Manager for Minecraft/Services/AppSupport/Export/ContentItemActionService.swift

@@ -16,7 +16,7 @@ struct ContentItemActionService: Sendable {
     }
 
     nonisolated func archiveContentType(for item: MinecraftContentItem) -> UTType {
-        UTType(filenameExtension: item.contentType.archiveExtension) ?? .data
+        UTType(filenameExtension: item.capabilities.portablePackageExtension ?? item.contentType.archiveExtension) ?? .data
     }
 
     nonisolated func persistExternalRepresentation(

World Manager for Minecraft/Services/AppSupport/Export/ContentPackageExporter.swift

@@ -37,7 +37,11 @@ enum ContentPackageExporter {
             try fileManager.removeItem(at: archiveURL)
         }
 
+        if isPortableFileItem(item) {
+            try copyPortableFileItem(item, to: archiveURL, fileManager: fileManager)
+        } else {
             try await createArchive(for: item, source: source, at: archiveURL)
+        }
         return archiveURL
     }
 
@@ -46,7 +50,7 @@ enum ContentPackageExporter {
     }
 
     nonisolated static func suggestedFilename(for item: MinecraftContentItem) -> String {
-        "\(suggestedBaseFilename(for: item)).\(item.contentType.archiveExtension)"
+        "\(suggestedBaseFilename(for: item)).\(archiveExtension(for: item))"
     }
 
     nonisolated static func finalArchiveURL(for item: MinecraftContentItem, destinationURL: URL) -> URL {
@@ -209,7 +213,7 @@ enum ContentPackageExporter {
 
         return requestDirectoryURL
             .appendingPathComponent(suggestedBaseFilename(for: item))
-            .appendingPathExtension(item.contentType.archiveExtension)
+            .appendingPathExtension(archiveExtension(for: item))
     }
 
     nonisolated private static func shareCacheKey(for item: MinecraftContentItem) -> String {
@@ -271,7 +275,7 @@ enum ContentPackageExporter {
 
     nonisolated private static func normalizedArchiveURL(for item: MinecraftContentItem, destinationURL: URL) -> URL {
         let normalizedDestinationURL = destinationURL.standardizedFileURL
-        let requiredExtension = item.contentType.archiveExtension
+        let requiredExtension = archiveExtension(for: item)
 
         if normalizedDestinationURL.pathExtension.lowercased() == requiredExtension {
             return normalizedDestinationURL
@@ -280,6 +284,32 @@ enum ContentPackageExporter {
         return normalizedDestinationURL.appendingPathExtension(requiredExtension)
     }
 
+    nonisolated private static func archiveExtension(for item: MinecraftContentItem) -> String {
+        item.capabilities.portablePackageExtension ?? item.contentType.archiveExtension
+    }
+
+    nonisolated private static func isPortableFileItem(_ item: MinecraftContentItem) -> Bool {
+        guard item.sourceEdition == .java else {
+            return false
+        }
+
+        guard let expectedExtension = item.capabilities.portablePackageExtension else {
+            return false
+        }
+
+        let values = try? item.folderURL.resourceValues(forKeys: [.isRegularFileKey])
+        return values?.isRegularFile == true
+            && item.folderURL.pathExtension.localizedCaseInsensitiveCompare(expectedExtension) == .orderedSame
+    }
+
+    nonisolated private static func copyPortableFileItem(
+        _ item: MinecraftContentItem,
+        to destinationURL: URL,
+        fileManager: FileManager
+    ) throws {
+        try fileManager.copyItem(at: item.folderURL, to: destinationURL)
+    }
+
     nonisolated private static func uniqueArchiveURL(
         in directoryURL: URL,
         baseName: String,

World Manager for Minecraft/Services/AppSupport/Scanning/ContentItemFileFacts.swift

@@ -25,6 +25,8 @@ struct ContentItemFileFacts: Sendable {
             self.approximateAgeText = nil
         }
 
+        switch item.sourceEdition {
+        case .bedrock:
             switch item.contentType {
             case .world:
                 let levelDBURL = item.folderURL.appendingPathComponent("db", isDirectory: true)
@@ -34,5 +36,21 @@ struct ContentItemFileFacts: Sendable {
             case .behaviorPack, .resourcePack, .skinPack, .worldTemplate:
                 self.storageFormatLabel = "Manifest-based package"
             }
+        case .java:
+            switch item.contentKind {
+            case .world:
+                self.storageFormatLabel = "Anvil world storage"
+            case .mod:
+                self.storageFormatLabel = "Java mod archive"
+            case .shaderPack:
+                self.storageFormatLabel = "Shader pack archive"
+            case .resourcePack:
+                self.storageFormatLabel = "Resource pack archive"
+            case .dataPack:
+                self.storageFormatLabel = "Data pack archive"
+            case .behaviorPack, .skinPack, .worldTemplate:
+                self.storageFormatLabel = "Java content"
+            }
+        }
     }
 }

World Manager for Minecraft/Services/AppSupport/Scanning/WorldScanner.swift

@@ -3,7 +3,9 @@
 
 import Foundation
 
-enum WorldScanner {
+typealias WorldScanner = BedrockContentScanner
+
+enum BedrockContentScanner {
     nonisolated static func loadSize(for item: MinecraftContentItem) -> MinecraftContentItem {
         let fileManager = FileManager.default
         var sizedItem = item
@@ -20,6 +22,49 @@ enum WorldScanner {
         await packReferenceIndexStore.reset(for: sourceRootURL)
     }
 
+    nonisolated static func probeLocalFolder(_ url: URL, providerID: PlatformProviderID) -> SourceProbeResult? {
+        let fileManager = FileManager.default
+        let normalizedURL = url.standardizedFileURL
+        var detectedKinds = Set<MinecraftContentKind>()
+        var score = 0
+
+        let collectionKinds: [(String, MinecraftContentKind)] = [
+            ("minecraftWorlds", .world),
+            ("behavior_packs", .behaviorPack),
+            ("resource_packs", .resourcePack),
+            ("skin_packs", .skinPack),
+            ("world_templates", .worldTemplate)
+        ]
+
+        for (folderName, kind) in collectionKinds {
+            if fileManager.fileExists(atPath: normalizedURL.appendingPathComponent(folderName, isDirectory: true).path) {
+                detectedKinds.insert(kind)
+                score += 25
+            }
+        }
+
+        if fileManager.fileExists(atPath: normalizedURL.appendingPathComponent("db", isDirectory: true).path)
+            || fileManager.fileExists(atPath: normalizedURL.appendingPathComponent("levelname.txt").path) {
+            detectedKinds.insert(.world)
+            score += 35
+        }
+
+        guard score > 0 else {
+            return nil
+        }
+
+        let confidence: SourceProbeConfidence = score >= 50 ? .strong : .medium
+        return SourceProbeResult(
+            providerID: providerID,
+            edition: .bedrock,
+            confidence: confidence,
+            sourceRootURL: normalizedURL,
+            displayName: normalizedURL.lastPathComponent,
+            detectedKinds: detectedKinds,
+            warnings: []
+        )
+    }
+
     nonisolated static func discoverItems(
         in searchRootURL: URL,
         onDiscovered: @Sendable (MinecraftContentItem) -> Void = { _ in }
@@ -162,7 +207,7 @@ enum WorldScanner {
             ? MinecraftContentMetadataReader.worldMetadata(in: item.folderURL, fileManager: fileManager)
             : nil
         enrichedItem.lastPlayedDate = lastPlayedDate(for: item, fileManager: fileManager, worldMetadata: enrichedItem.worldMetadata)
-        enrichedItem.modifiedDate = modifiedDate(for: item.folderURL)
+        enrichedItem.modifiedDate = WorldScanner.modifiedDate(for: item.folderURL)
         if let manifestMetadata = MinecraftContentMetadataReader.manifestMetadata(in: item.folderURL, fileManager: fileManager) {
             enrichedItem.packUUID = manifestMetadata.uuid
             enrichedItem.packVersion = manifestMetadata.version
@@ -322,11 +367,11 @@ enum WorldScanner {
         return worldMetadata?.lastPlayedDate
     }
 
-    nonisolated private static func modifiedDate(for directoryURL: URL) -> Date? {
+    nonisolated fileprivate static func modifiedDate(for directoryURL: URL) -> Date? {
         try? directoryURL.resourceValues(forKeys: [.contentModificationDateKey]).contentModificationDate
     }
 
-    nonisolated private static func folderSize(at folderURL: URL, fileManager: FileManager) -> Int64? {
+    nonisolated fileprivate static func folderSize(at folderURL: URL, fileManager: FileManager) -> Int64? {
         guard let enumerator = fileManager.enumerator(
             at: folderURL,
             includingPropertiesForKeys: [.isRegularFileKey, .fileSizeKey],
@@ -580,4 +625,593 @@ private actor PackReferenceIndexStore {
     }
 }
 
+enum JavaContentScanner {
+    nonisolated static func probeLocalFolder(_ url: URL, providerID: PlatformProviderID) -> SourceProbeResult? {
+        let fileManager = FileManager.default
+        let candidates = localFolderProbeCandidates(for: url.standardizedFileURL, fileManager: fileManager)
+        let scoredCandidates = candidates.compactMap { candidate -> (url: URL, score: Int, kinds: Set<MinecraftContentKind>)? in
+            let score = javaProbeScore(for: candidate, fileManager: fileManager)
+            guard score.value > 0 else {
+                return nil
+            }
+
+            return (candidate, score.value, score.kinds)
+        }
+
+        guard let best = scoredCandidates.max(by: { lhs, rhs in
+            if lhs.score != rhs.score {
+                return lhs.score < rhs.score
+            }
+
+            return lhs.url.path.count > rhs.url.path.count
+        }) else {
+            return nil
+        }
+
+        let confidence: SourceProbeConfidence
+        if best.score >= 70 {
+            confidence = .exact
+        } else if best.score >= 45 {
+            confidence = .strong
+        } else {
+            confidence = .medium
+        }
+
+        let warnings = best.url.standardizedFileURL == url.standardizedFileURL ? [] : [
+            "Using nested Java instance folder: \(best.url.lastPathComponent)"
+        ]
+
+        return SourceProbeResult(
+            providerID: providerID,
+            edition: .java,
+            confidence: confidence,
+            sourceRootURL: best.url.standardizedFileURL,
+            displayName: best.url.lastPathComponent,
+            detectedKinds: best.kinds,
+            warnings: warnings
+        )
+    }
+
+    nonisolated static func discoverSourceCandidates(
+        providerID: PlatformProviderID,
+        searchRoots: [URL]? = nil,
+        fileManager: FileManager = .default
+    ) -> [SourceCandidate] {
+        let roots = uniqueStandardizedURLs(searchRoots ?? defaultCandidateSearchRoots(fileManager: fileManager))
+            .map(\.standardizedFileURL)
+            .filter { fileManager.fileExists(atPath: $0.path) }
+
+        var candidatesByID: [String: SourceCandidate] = [:]
+        for root in roots {
+            let candidateFolders = boundedCandidateFolders(from: root, maxDepth: 4, maxFolderCount: 600, fileManager: fileManager)
+            var candidatesForRoot: [SourceCandidate] = []
+            for folderURL in candidateFolders {
+                guard let probe = probeLocalFolder(folderURL, providerID: providerID) else {
+                    continue
+                }
+
+                let candidate = SourceCandidate(
+                    providerID: probe.providerID,
+                    edition: probe.edition,
+                    sourceRootURL: probe.sourceRootURL,
+                    displayName: probe.displayName,
+                    confidence: probe.confidence,
+                    reason: "Found Java markers near \(root.lastPathComponent)",
+                    detectedKinds: probe.detectedKinds
+                )
+
+                candidatesForRoot.append(candidate)
+            }
+
+            for candidate in collapsedCandidates(
+                candidatesForRoot,
+                under: root,
+                providerID: providerID
+            ) {
+                if let existingCandidate = candidatesByID[candidate.id],
+                   existingCandidate.confidence >= candidate.confidence {
+                    continue
+                }
+
+                candidatesByID[candidate.id] = candidate
+            }
+        }
+
+        return candidatesByID.values.sorted {
+            if $0.confidence != $1.confidence {
+                return $0.confidence > $1.confidence
+            }
+
+            return $0.displayName.localizedStandardCompare($1.displayName) == .orderedAscending
+        }
+    }
+
+    nonisolated static func discoverItems(
+        in searchRootURL: URL,
+        onDiscovered: @Sendable (MinecraftContentItem) -> Void = { _ in }
+    ) throws -> [MinecraftContentItem] {
+        let fileManager = FileManager.default
+        var discoveredItems: [MinecraftContentItem] = []
+
+        for scanRootURL in contentScanRoots(for: searchRootURL, fileManager: fileManager) {
+            let savesRootURL = existingDirectory(
+                named: "saves",
+                in: scanRootURL,
+                fileManager: fileManager
+            ) ?? scanRootURL
+            let worldItems = try discoverWorlds(in: savesRootURL, fileManager: fileManager)
+            discoveredItems.append(contentsOf: worldItems)
+
+            if let resourcePacksURL = existingDirectory(named: "resourcepacks", in: scanRootURL, fileManager: fileManager) {
+                let resourcePackItems = try discoverResourcePacks(in: resourcePacksURL, fileManager: fileManager)
+                discoveredItems.append(contentsOf: resourcePackItems)
+            }
+
+            if let dataPacksURL = existingDirectory(named: "datapacks", in: scanRootURL, fileManager: fileManager) {
+                discoveredItems.append(contentsOf: try discoverJavaPackages(
+                    in: dataPacksURL,
+                    contentKind: .dataPack,
+                    platformType: .dataPack,
+                    packageExtension: "zip",
+                    fileManager: fileManager
+                ))
+            }
+
+            if let shaderPacksURL = existingDirectory(named: "shaderpacks", in: scanRootURL, fileManager: fileManager) {
+                discoveredItems.append(contentsOf: try discoverJavaPackages(
+                    in: shaderPacksURL,
+                    contentKind: .shaderPack,
+                    platformType: .shaderPack,
+                    packageExtension: "zip",
+                    fileManager: fileManager
+                ))
+            }
+
+            if let modsURL = existingDirectory(named: "mods", in: scanRootURL, fileManager: fileManager) {
+                discoveredItems.append(contentsOf: try discoverJavaPackages(
+                    in: modsURL,
+                    contentKind: .mod,
+                    platformType: .mod,
+                    packageExtension: "jar",
+                    fileManager: fileManager
+                ))
+            }
+        }
+
+        discoveredItems.sort(by: WorldScanner.sortItems)
+        discoveredItems.forEach(onDiscovered)
+        return discoveredItems
+    }
+
+    nonisolated static func enrich(item: MinecraftContentItem) async -> MinecraftContentItem {
+        var enrichedItem = item
+        let metadata = JavaContentMetadataReader.metadata(for: item)
+        enrichedItem.displayName = metadata?.displayName ?? displayName(for: item)
+        enrichedItem.iconURL = await JavaContentMetadataReader.cachedIconURL(for: item, metadata: metadata)
+        if let packMetadata = metadata?.pack {
+            enrichedItem.platformMetadata = .java(JavaContentMetadata(pack: packMetadata))
+        }
+        enrichedItem.hasKnownIcon = enrichedItem.iconURL != nil
+        enrichedItem.modifiedDate = WorldScanner.modifiedDate(for: item.folderURL)
+        enrichedItem.metadataLoaded = true
+        enrichedItem.previewLoaded = true
+        enrichedItem.sizeLoaded = false
+        return enrichedItem
+    }
+
+    nonisolated static func loadSize(for item: MinecraftContentItem) -> MinecraftContentItem {
+        var sizedItem = item
+        sizedItem.sizeBytes = contentSize(at: item.folderURL, fileManager: .default)
+        sizedItem.sizeLoaded = true
+        return sizedItem
+    }
+
+    nonisolated static func collectionSnapshots(in sourceRootURL: URL) -> [CollectionSnapshot] {
+        let fileManager = FileManager.default
+        var snapshots: [CollectionSnapshot] = []
+        for scanRootURL in contentScanRoots(for: sourceRootURL, fileManager: fileManager) {
+            let candidateRoots = [
+                existingDirectory(named: "saves", in: scanRootURL, fileManager: fileManager),
+                existingDirectory(named: "resourcepacks", in: scanRootURL, fileManager: fileManager),
+                existingDirectory(named: "datapacks", in: scanRootURL, fileManager: fileManager),
+                existingDirectory(named: "shaderpacks", in: scanRootURL, fileManager: fileManager),
+                existingDirectory(named: "mods", in: scanRootURL, fileManager: fileManager)
+            ]
+
+            for collectionURL in candidateRoots {
+                guard let collectionURL else {
+                    continue
+                }
+
+                if let snapshot = collectionSnapshot(
+                    for: collectionURL,
+                    sourceRootURL: sourceRootURL,
+                    fileManager: fileManager
+                ) {
+                    snapshots.append(snapshot)
+                }
+            }
+        }
+
+        return snapshots
+    }
+
+    nonisolated private static func discoverWorlds(in savesRootURL: URL, fileManager: FileManager) throws -> [MinecraftContentItem] {
+        let worldDirectories = try WorldScanner.immediateChildDirectories(of: savesRootURL, fileManager: fileManager)
+        return worldDirectories.compactMap { worldURL in
+            guard fileManager.fileExists(atPath: worldURL.appendingPathComponent("level.dat").path) else {
+                return nil
+            }
+
+            return MinecraftContentItem(
+                folderURL: worldURL,
+                folderName: worldURL.lastPathComponent,
+                contentType: .world,
+                sourceEdition: .java,
+                contentKind: .world,
+                platformType: .java(.world),
+                collectionRootURL: savesRootURL,
+                capabilities: .java(contentType: .world),
+                platformMetadata: .java(JavaContentMetadata())
+            )
+        }
+    }
+
+    nonisolated private static func discoverResourcePacks(in resourcePacksURL: URL, fileManager: FileManager) throws -> [MinecraftContentItem] {
+        try discoverJavaPackages(
+            in: resourcePacksURL,
+            contentKind: .resourcePack,
+            platformType: .resourcePack,
+            packageExtension: "zip",
+            fileManager: fileManager,
+            folderMarker: "pack.mcmeta"
+        )
+    }
+
+    nonisolated private static func discoverJavaPackages(
+        in collectionURL: URL,
+        contentKind: MinecraftContentKind,
+        platformType: JavaContentType,
+        packageExtension: String,
+        fileManager: FileManager,
+        folderMarker: String? = nil
+    ) throws -> [MinecraftContentItem] {
+        let children = try fileManager.contentsOfDirectory(
+            at: collectionURL,
+            includingPropertiesForKeys: [.isDirectoryKey, .isRegularFileKey],
+            options: [.skipsHiddenFiles]
+        )
+
+        return children.compactMap { childURL in
+            let values = try? childURL.resourceValues(forKeys: [.isDirectoryKey, .isRegularFileKey])
+            let isDirectory = values?.isDirectory == true
+            let isRegularFile = values?.isRegularFile == true
+
+            if isDirectory {
+                if let folderMarker,
+                   !fileManager.fileExists(atPath: childURL.appendingPathComponent(folderMarker).path) {
+                    return nil
+                }
+            } else if isRegularFile {
+                guard childURL.pathExtension.localizedCaseInsensitiveCompare(packageExtension) == .orderedSame else {
+                    return nil
+                }
+            } else {
+                return nil
+            }
+
+            return javaContentItem(
+                url: childURL,
+                contentKind: contentKind,
+                platformType: platformType,
+                collectionRootURL: collectionURL
+            )
+        }
+    }
+
+    nonisolated private static func existingDirectory(named name: String, in rootURL: URL, fileManager: FileManager) -> URL? {
+        let directoryURL = rootURL.appendingPathComponent(name, isDirectory: true)
+        guard (try? directoryURL.resourceValues(forKeys: [.isDirectoryKey]).isDirectory) == true else {
+            return nil
+        }
+
+        return directoryURL
+    }
+
+    nonisolated private static func javaContentItem(
+        url: URL,
+        contentKind: MinecraftContentKind,
+        platformType: JavaContentType,
+        collectionRootURL: URL
+    ) -> MinecraftContentItem {
+        MinecraftContentItem(
+            folderURL: url,
+            folderName: url.lastPathComponent,
+            contentType: contentKind == .world ? .world : .resourcePack,
+            sourceEdition: .java,
+            contentKind: contentKind,
+            platformType: .java(platformType),
+            collectionRootURL: collectionRootURL,
+            displayName: url.deletingPathExtension().lastPathComponent,
+            capabilities: .java(contentType: platformType),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+    }
+
+    nonisolated private static func contentSize(at url: URL, fileManager: FileManager) -> Int64? {
+        let values = try? url.resourceValues(forKeys: [.isDirectoryKey, .fileSizeKey])
+        if values?.isDirectory == true {
+            return WorldScanner.folderSize(at: url, fileManager: fileManager)
+        }
+
+        return values?.fileSize.map(Int64.init)
+    }
+
+    nonisolated private static func localFolderProbeCandidates(for url: URL, fileManager: FileManager) -> [URL] {
+        var candidates = [url]
+        let children = (try? fileManager.contentsOfDirectory(
+            at: url,
+            includingPropertiesForKeys: [.isDirectoryKey],
+            options: []
+        )) ?? []
+        candidates.append(contentsOf: children.filter {
+            (try? $0.resourceValues(forKeys: [.isDirectoryKey]).isDirectory) == true
+        })
+        return candidates
+    }
+
+    nonisolated private static func collapsedCandidates(
+        _ candidates: [SourceCandidate],
+        under root: URL,
+        providerID: PlatformProviderID
+    ) -> [SourceCandidate] {
+        let uniqueCandidates = Dictionary(grouping: candidates, by: { sourceIdentityKey(for: $0.sourceRootURL) }).compactMap { _, groupedCandidates in
+            groupedCandidates.max { lhs, rhs in
+                lhs.confidence < rhs.confidence
+            }
+        }
+
+        guard uniqueCandidates.count > 1 else {
+            return uniqueCandidates
+        }
+
+        let detectedKinds = uniqueCandidates.reduce(into: Set<MinecraftContentKind>()) { result, candidate in
+            result.formUnion(candidate.detectedKinds)
+        }
+        let confidence = uniqueCandidates.map(\.confidence).max() ?? .medium
+        let standardizedRoot = root.standardizedFileURL
+
+        return [
+            SourceCandidate(
+                providerID: providerID,
+                edition: .java,
+                sourceRootURL: standardizedRoot,
+                displayName: standardizedRoot.lastPathComponent,
+                confidence: confidence,
+                reason: "Found multiple Java sources under \(standardizedRoot.lastPathComponent)",
+                detectedKinds: detectedKinds
+            )
+        ]
+    }
+
+    nonisolated private static func javaProbeScore(for url: URL, fileManager: FileManager) -> (value: Int, kinds: Set<MinecraftContentKind>) {
+        var score = 0
+        var kinds = Set<MinecraftContentKind>()
+
+        if existingDirectory(named: "saves", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.world)
+            score += 25
+        }
+        if existingDirectory(named: "resourcepacks", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.resourcePack)
+            score += 20
+        }
+        if existingDirectory(named: "datapacks", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.dataPack)
+            score += 15
+        }
+        if existingDirectory(named: "shaderpacks", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.shaderPack)
+            score += 15
+        }
+        if existingDirectory(named: "mods", in: url, fileManager: fileManager) != nil {
+            kinds.insert(.mod)
+            score += 20
+        }
+        if fileManager.fileExists(atPath: url.appendingPathComponent("options.txt").path)
+            || fileManager.fileExists(atPath: url.appendingPathComponent("launcher_profiles.json").path)
+            || fileManager.fileExists(atPath: url.appendingPathComponent(".curseclient").path) {
+            score += 15
+        }
+        if fileManager.fileExists(atPath: url.appendingPathComponent("region", isDirectory: true).path)
+            && fileManager.fileExists(atPath: url.appendingPathComponent("level.dat").path) {
+            kinds.insert(.world)
+            score += 35
+        }
+
+        return (score, kinds)
+    }
+
+    nonisolated private static func defaultCandidateSearchRoots(fileManager: FileManager) -> [URL] {
+        let homeURL = fileManager.homeDirectoryForCurrentUser
+        let applicationSupportURL = homeURL
+            .appendingPathComponent("Library", isDirectory: true)
+            .appendingPathComponent("Application Support", isDirectory: true)
+        let documentsURL = homeURL.appendingPathComponent("Documents", isDirectory: true)
+
+        return [
+            applicationSupportURL.appendingPathComponent("minecraft", isDirectory: true),
+            documentsURL.appendingPathComponent("curseforge/minecraft", isDirectory: true),
+            documentsURL.appendingPathComponent("CurseForge/Minecraft", isDirectory: true),
+            applicationSupportURL.appendingPathComponent("PrismLauncher/instances", isDirectory: true),
+            applicationSupportURL.appendingPathComponent("MultiMC/instances", isDirectory: true),
+            applicationSupportURL.appendingPathComponent("PolyMC/instances", isDirectory: true),
+            applicationSupportURL.appendingPathComponent("com.modrinth.theseus/profiles", isDirectory: true),
+            applicationSupportURL.appendingPathComponent("ATLauncher/instances", isDirectory: true),
+            applicationSupportURL.appendingPathComponent("gdlauncher_next/instances", isDirectory: true),
+            applicationSupportURL.appendingPathComponent("GDLauncher_next/instances", isDirectory: true)
+        ]
+    }
+
+    nonisolated private static func boundedCandidateFolders(
+        from rootURL: URL,
+        maxDepth: Int,
+        maxFolderCount: Int,
+        fileManager: FileManager
+    ) -> [URL] {
+        var folders: [URL] = []
+        var queue: [(url: URL, depth: Int)] = [(rootURL, 0)]
+        var seen = Set<String>()
+
+        while !queue.isEmpty && folders.count < maxFolderCount {
+            let current = queue.removeFirst()
+            let normalizedURL = current.url.standardizedFileURL
+            guard seen.insert(sourceIdentityKey(for: normalizedURL)).inserted else {
+                continue
+            }
+
+            folders.append(normalizedURL)
+            guard current.depth < maxDepth else {
+                continue
+            }
+
+            let children = (try? fileManager.contentsOfDirectory(
+                at: normalizedURL,
+                includingPropertiesForKeys: [.isDirectoryKey],
+                options: []
+            )) ?? []
+
+            let childDirectories = children
+                .filter { (try? $0.resourceValues(forKeys: [.isDirectoryKey]).isDirectory) == true }
+                .sorted { lhs, rhs in
+                    lhs.lastPathComponent.localizedStandardCompare(rhs.lastPathComponent) == .orderedAscending
+                }
+
+            queue.append(contentsOf: childDirectories.map { ($0, current.depth + 1) })
+        }
+
+        return folders
+    }
+
+    nonisolated private static func contentScanRoots(for sourceRootURL: URL, fileManager: FileManager) -> [URL] {
+        let standardizedRoot = sourceRootURL.standardizedFileURL
+        if javaProbeScore(for: standardizedRoot, fileManager: fileManager).value > 0 {
+            return [standardizedRoot]
+        }
+
+        let discoveredRoots = boundedCandidateFolders(
+            from: standardizedRoot,
+            maxDepth: 4,
+            maxFolderCount: 600,
+            fileManager: fileManager
+        ).filter { candidateURL in
+            candidateURL != standardizedRoot
+                && javaProbeScore(for: candidateURL, fileManager: fileManager).value > 0
+        }
+
+        return uniqueStandardizedURLs(discoveredRoots).sorted {
+            $0.path.localizedStandardCompare($1.path) == .orderedAscending
+        }
+    }
+
+    nonisolated private static func uniqueStandardizedURLs(_ urls: [URL]) -> [URL] {
+        var seen = Set<String>()
+        var result: [URL] = []
+        result.reserveCapacity(urls.count)
+
+        for url in urls {
+            let standardizedURL = url.standardizedFileURL
+            guard seen.insert(sourceIdentityKey(for: standardizedURL)).inserted else {
+                continue
+            }
+
+            result.append(standardizedURL)
+        }
+
+        return result
+    }
+
+    nonisolated private static func collectionSnapshot(
+        for collectionURL: URL,
+        sourceRootURL: URL,
+        fileManager: FileManager
+    ) -> CollectionSnapshot? {
+        guard fileManager.fileExists(atPath: collectionURL.path) else {
+            return nil
+        }
+
+        let children = (try? fileManager.contentsOfDirectory(
+            at: collectionURL,
+            includingPropertiesForKeys: [.isDirectoryKey, .isRegularFileKey, .contentModificationDateKey, .fileSizeKey],
+            options: [.skipsHiddenFiles]
+        )) ?? []
+        let childSnapshots = children.compactMap { childURL -> (name: String, modifiedDate: Date?, size: Int?)? in
+            let values = try? childURL.resourceValues(forKeys: [
+                .isDirectoryKey,
+                .isRegularFileKey,
+                .contentModificationDateKey,
+                .fileSizeKey
+            ])
+            guard values?.isDirectory == true || values?.isRegularFile == true else {
+                return nil
+            }
+
+            return (childURL.lastPathComponent, values?.contentModificationDate, values?.fileSize)
+        }.sorted {
+            $0.name.localizedStandardCompare($1.name) == .orderedAscending
+        }
+
+        let modifiedDate = try? collectionURL.resourceValues(forKeys: [.contentModificationDateKey]).contentModificationDate
+        let childFingerprint = childSnapshots.map { child in
+            [
+                child.name,
+                child.modifiedDate?.timeIntervalSince1970.formatted() ?? "nil",
+                child.size.map(String.init) ?? "nil"
+            ].joined(separator: "@")
+        }.joined(separator: "|")
+
+        let folderName = relativePath(from: sourceRootURL.standardizedFileURL, to: collectionURL.standardizedFileURL)
+            ?? collectionURL.lastPathComponent
+
+        return CollectionSnapshot(
+            folderName: folderName,
+            modifiedDate: modifiedDate,
+            childDirectoryCount: childSnapshots.count,
+            fingerprint: [
+                folderName,
+                String(childSnapshots.count),
+                modifiedDate?.timeIntervalSince1970.formatted() ?? "nil",
+                childFingerprint
+            ].joined(separator: "::")
+        )
+    }
+
+    nonisolated private static func relativePath(from rootURL: URL, to childURL: URL) -> String? {
+        let rootPath = rootURL.standardizedFileURL.path
+        let childPath = childURL.standardizedFileURL.path
+        guard childPath.hasPrefix(rootPath + "/") else {
+            return nil
+        }
+
+        return String(childPath.dropFirst(rootPath.count + 1))
+    }
+
+    nonisolated private static func displayName(for item: MinecraftContentItem) -> String {
+        guard item.contentKind == .world else {
+            return item.folderName
+        }
+
+        let levelNameURL = item.folderURL.appendingPathComponent("levelname.txt")
+        guard
+            let value = try? String(contentsOf: levelNameURL, encoding: .utf8)
+                .trimmingCharacters(in: .whitespacesAndNewlines),
+            !value.isEmpty
+        else {
+            return item.folderName
+        }
+
+        return value
+    }
+}
+
 private let packReferenceIndexStore = PackReferenceIndexStore()

World Manager for Minecraft/Services/ArchiveInspection/JavaContentMetadataReader.swift

@@ -0,0 +1,285 @@
+// SPDX-FileCopyrightText: 2026 John Burwell and contributors
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import Foundation
+
+nonisolated struct JavaArchiveMetadata: Hashable, Sendable {
+    var displayName: String?
+    var pack: JavaPackMetadata?
+    var iconEntryPath: String?
+}
+
+enum JavaContentMetadataReader {
+    nonisolated static func metadata(for item: MinecraftContentItem) -> JavaArchiveMetadata? {
+        let values = try? item.folderURL.resourceValues(forKeys: [.isDirectoryKey, .isRegularFileKey])
+        if values?.isDirectory == true {
+            return directoryMetadata(for: item)
+        }
+
+        if values?.isRegularFile == true {
+            return archiveMetadata(for: item.folderURL, contentKind: item.contentKind)
+        }
+
+        return nil
+    }
+
+    nonisolated static func cachedIconURL(for item: MinecraftContentItem, metadata: JavaArchiveMetadata?) async -> URL? {
+        let values = try? item.folderURL.resourceValues(forKeys: [.isDirectoryKey, .isRegularFileKey])
+        if values?.isDirectory == true {
+            return await ImageCacheStore.shared.cachedImageURL(for: directoryIconURL(for: item))
+        }
+
+        guard
+            values?.isRegularFile == true,
+            let metadata,
+            let iconEntryPath = metadata.iconEntryPath,
+            let archive = try? ZipArchiveReader(url: item.folderURL),
+            let entry = archive.entry(named: iconEntryPath),
+            let data = try? archive.extract(entry)
+        else {
+            return nil
+        }
+
+        return await ImageCacheStore.shared.cachedImageURL(
+            forRemoteData: data,
+            cacheKey: "java-archive-icon:\(item.folderURL.standardizedFileURL.path):\(iconEntryPath)",
+            pathExtension: URL(fileURLWithPath: iconEntryPath).pathExtension
+        )
+    }
+
+    nonisolated private static func directoryMetadata(for item: MinecraftContentItem) -> JavaArchiveMetadata {
+        let pack = packMetadata(from: item.folderURL.appendingPathComponent("pack.mcmeta"))
+        let iconURL = directoryIconURL(for: item)
+
+        return JavaArchiveMetadata(
+            displayName: nil,
+            pack: pack,
+            iconEntryPath: iconURL?.lastPathComponent
+        )
+    }
+
+    nonisolated private static func archiveMetadata(for archiveURL: URL, contentKind: MinecraftContentKind) -> JavaArchiveMetadata? {
+        guard let archive = try? ZipArchiveReader(url: archiveURL) else {
+            return nil
+        }
+
+        let pack = packMetadata(from: archive)
+        let modMetadata = contentKind == .mod ? modMetadata(from: archive) : nil
+        let iconEntryPath = iconEntryPath(
+            in: archive,
+            preferredPath: modMetadata?.iconPath,
+            contentKind: contentKind
+        )
+
+        return JavaArchiveMetadata(
+            displayName: modMetadata?.displayName,
+            pack: pack,
+            iconEntryPath: iconEntryPath
+        )
+    }
+
+    nonisolated private static func directoryIconURL(for item: MinecraftContentItem) -> URL? {
+        let candidateNames: [String]
+        switch item.contentKind {
+        case .mod:
+            candidateNames = ["icon.png", "logo.png", "mod_logo.png", "catalogue_icon.png", "pack.png"]
+        case .resourcePack, .dataPack, .shaderPack:
+            candidateNames = ["pack.png", "icon.png", "logo.png"]
+        case .world, .behaviorPack, .skinPack, .worldTemplate:
+            candidateNames = ["icon.png", "pack.png"]
+        }
+
+        for candidateName in candidateNames {
+            let candidateURL = item.folderURL.appendingPathComponent(candidateName)
+            if FileManager.default.fileExists(atPath: candidateURL.path) {
+                return candidateURL
+            }
+        }
+
+        return nil
+    }
+
+    nonisolated private static func packMetadata(from metadataURL: URL) -> JavaPackMetadata? {
+        guard let data = try? Data(contentsOf: metadataURL) else {
+            return nil
+        }
+
+        return packMetadata(from: data)
+    }
+
+    nonisolated private static func packMetadata(from archive: ZipArchiveReader) -> JavaPackMetadata? {
+        guard
+            let entry = archive.entry(named: "pack.mcmeta"),
+            let data = try? archive.extract(entry)
+        else {
+            return nil
+        }
+
+        return packMetadata(from: data)
+    }
+
+    nonisolated private static func packMetadata(from data: Data) -> JavaPackMetadata? {
+        guard
+            let jsonObject = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
+            let packObject = jsonObject["pack"] as? [String: Any]
+        else {
+            return nil
+        }
+
+        return JavaPackMetadata(
+            packFormat: packObject["pack_format"] as? Int,
+            description: textValue(from: packObject["description"])
+        )
+    }
+
+    nonisolated private static func modMetadata(from archive: ZipArchiveReader) -> (displayName: String?, iconPath: String?)? {
+        if let tomlMetadata = modTOMLMetadata(from: archive) {
+            return tomlMetadata
+        }
+
+        if let jsonMetadata = modJSONMetadata(from: archive, entryName: "fabric.mod.json") {
+            return jsonMetadata
+        }
+
+        if let jsonMetadata = modJSONMetadata(from: archive, entryName: "quilt.mod.json") {
+            return jsonMetadata
+        }
+
+        return nil
+    }
+
+    nonisolated private static func modTOMLMetadata(from archive: ZipArchiveReader) -> (displayName: String?, iconPath: String?)? {
+        let entryNames = ["META-INF/neoforge.mods.toml", "META-INF/mods.toml"]
+        for entryName in entryNames {
+            guard
+                let entry = archive.entry(named: entryName),
+                let data = try? archive.extract(entry),
+                let text = String(data: data, encoding: .utf8)
+            else {
+                continue
+            }
+
+            let firstModSection = firstTOMLSection(named: "[[mods]]", in: text)
+            let displayName = tomlStringValue(forKey: "displayName", in: firstModSection)
+            let logoFile = tomlStringValue(forKey: "logoFile", in: firstModSection)
+            if displayName != nil || logoFile != nil {
+                return (displayName, logoFile)
+            }
+        }
+
+        return nil
+    }
+
+    nonisolated private static func modJSONMetadata(
+        from archive: ZipArchiveReader,
+        entryName: String
+    ) -> (displayName: String?, iconPath: String?)? {
+        guard
+            let entry = archive.entry(named: entryName),
+            let data = try? archive.extract(entry),
+            let jsonObject = try? JSONSerialization.jsonObject(with: data) as? [String: Any]
+        else {
+            return nil
+        }
+
+        let iconPath: String?
+        if let iconString = jsonObject["icon"] as? String {
+            iconPath = iconString
+        } else if let icons = jsonObject["icon"] as? [String: String] {
+            iconPath = icons.sorted { lhs, rhs in lhs.key.localizedStandardCompare(rhs.key) == .orderedDescending }.first?.value
+        } else {
+            iconPath = nil
+        }
+
+        return (
+            (jsonObject["name"] as? String)?.nilIfBlank,
+            iconPath?.nilIfBlank
+        )
+    }
+
+    nonisolated private static func firstTOMLSection(named sectionName: String, in text: String) -> String {
+        guard let sectionRange = text.range(of: sectionName) else {
+            return text
+        }
+
+        let sectionText = text[sectionRange.upperBound...]
+        if let nextSectionRange = sectionText.range(of: "\n[") {
+            return String(sectionText[..<nextSectionRange.lowerBound])
+        }
+
+        return String(sectionText)
+    }
+
+    nonisolated private static func tomlStringValue(forKey key: String, in text: String) -> String? {
+        for rawLine in text.components(separatedBy: .newlines) {
+            let line = rawLine.trimmingCharacters(in: .whitespacesAndNewlines)
+            guard line.hasPrefix(key) else {
+                continue
+            }
+
+            let parts = line.split(separator: "=", maxSplits: 1).map(String.init)
+            guard parts.count == 2 else {
+                continue
+            }
+
+            return parts[1]
+                .trimmingCharacters(in: .whitespacesAndNewlines)
+                .trimmingCharacters(in: CharacterSet(charactersIn: "\"'"))
+                .nilIfBlank
+        }
+
+        return nil
+    }
+
+    nonisolated private static func iconEntryPath(
+        in archive: ZipArchiveReader,
+        preferredPath: String?,
+        contentKind: MinecraftContentKind
+    ) -> String? {
+        let candidateNames: [String]
+        switch contentKind {
+        case .mod:
+            candidateNames = [preferredPath, "icon.png", "logo.png", "mod_logo.png", "catalogue_icon.png", "pack.png"].compactMap(\.self)
+        case .resourcePack, .dataPack, .shaderPack:
+            candidateNames = [preferredPath, "pack.png", "icon.png", "logo.png"].compactMap(\.self)
+        case .world, .behaviorPack, .skinPack, .worldTemplate:
+            candidateNames = [preferredPath, "icon.png", "pack.png"].compactMap(\.self)
+        }
+
+        for candidateName in candidateNames {
+            if let entry = archive.entry(named: candidateName), !entry.isDirectory {
+                return entry.path
+            }
+        }
+
+        return archive.entries
+            .filter { !$0.isDirectory && $0.path.localizedCaseInsensitiveContains("icon") && $0.path.hasSuffix(".png") }
+            .sorted { lhs, rhs in lhs.path.localizedStandardCompare(rhs.path) == .orderedAscending }
+            .first?
+            .path
+    }
+
+    nonisolated private static func textValue(from value: Any?) -> String? {
+        if let text = value as? String {
+            return text.nilIfBlank
+        }
+
+        if let object = value as? [String: Any] {
+            if let text = object["text"] as? String {
+                return text.nilIfBlank
+            }
+            if let translate = object["translate"] as? String {
+                return translate.nilIfBlank
+            }
+        }
+
+        return nil
+    }
+}
+
+private extension String {
+    nonisolated var nilIfBlank: String? {
+        let trimmed = trimmingCharacters(in: .whitespacesAndNewlines)
+        return trimmed.isEmpty ? nil : trimmed
+    }
+}

World Manager for Minecraft/Services/ArchiveInspection/MinecraftContentMetadataReader.swift

@@ -10,7 +10,9 @@ struct MinecraftManifestMetadata: Sendable, Hashable {
     let minimumEngineVersion: String?
 }
 
-enum MinecraftContentMetadataReader {
+typealias MinecraftContentMetadataReader = BedrockContentMetadataReader
+
+enum BedrockContentMetadataReader {
     nonisolated static func displayName(
         for directoryURL: URL,
         contentType: MinecraftContentType,

World Manager for Minecraft/Services/Sources/Core/SourceLibrary.swift

@@ -6,6 +6,11 @@ import Foundation
 import OSLog
 import UniformTypeIdentifiers
 
+enum SourceLibraryCommand: Sendable {
+    case discoverSourceCandidates
+    case refreshAllSources
+}
+
 @MainActor
 final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePersistenceHosting, ConnectedDeviceRuntimeHosting, LocalSourceRuntimeHosting, SourceSyncRuntimeHosting {
     private static let enrichmentWorkerCount = 4
@@ -28,10 +33,13 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         }
     }
     @Published var connectedDevices: [ConnectedDeviceSidebarEntry] = []
+    @Published var sourceCandidates: [SourceCandidate] = []
+    @Published var isDiscoveringSourceCandidates = false
     @Published var isRestoringPersistedSources = true
 
     private var scanTasks: [URL: Task<Void, Never>] = [:]
     private var automaticSyncTasks: [URL: Task<Void, Never>] = [:]
+    private var candidateDiscoveryTask: Task<Void, Never>?
     private var connectedDeviceRefreshTask: Task<Void, Never>?
     private var localSourceRefreshTask: Task<Void, Never>?
     private let persistenceStore: SourcePersistenceStore
@@ -80,6 +88,7 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
     deinit {
         connectedDeviceRefreshTask?.cancel()
         localSourceRefreshTask?.cancel()
+        candidateDiscoveryTask?.cancel()
         automaticSyncTasks.values.forEach { $0.cancel() }
         scanTasks.values.forEach { $0.cancel() }
     }
@@ -92,6 +101,22 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         visibleSources
     }
 
+    var sidebarConnectedDevices: [ConnectedDeviceSidebarEntry] {
+        connectedDevices.filter { entry in
+            guard entry.matchedSourceID == nil else {
+                return false
+            }
+
+            return !sources.contains { source in
+                guard case .connectedDevice(let device, _) = source.origin else {
+                    return false
+                }
+
+                return device.udid == entry.device.udid
+            }
+        }
+    }
+
     func sourceID(forItemID itemID: URL) -> URL? {
         sourceIDByItemID[itemID]
     }
@@ -110,6 +135,8 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         connectedDeviceRefreshTask = nil
         localSourceRefreshTask?.cancel()
         localSourceRefreshTask = nil
+        candidateDiscoveryTask?.cancel()
+        candidateDiscoveryTask = nil
 
         for task in automaticSyncTasks.values {
             task.cancel()
@@ -137,40 +164,121 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         )
     }
 
-    func addSource(at url: URL) -> URL {
-        let normalizedURL = url.standardizedFileURL
-        let bookmarkData = securityScopedBookmarkData(for: normalizedURL)
+    func perform(_ command: SourceLibraryCommand) {
+        switch command {
+        case .discoverSourceCandidates:
+            discoverSourceCandidates()
+        case .refreshAllSources:
+            for source in visibleSources where source.availability == .available {
+                startScan(for: source.id, mode: .fullScan)
+            }
+        }
+    }
 
-        if sources.contains(where: { $0.id == normalizedURL }) {
-            updateSource(normalizedURL) { source in
+    func addSource(at url: URL) async -> URL {
+        let selectedURL = url.standardizedFileURL
+        let probe = await sourceAccessMethod.probeLocalFolder(selectedURL)
+        let normalizedURL = (probe?.sourceRootURL ?? selectedURL).standardizedFileURL
+        let bookmarkData = securityScopedBookmarkData(for: normalizedURL) ?? securityScopedBookmarkData(for: selectedURL)
+        let providerID = probe?.providerID ?? LocalFolderSourceAccess().accessorIdentifier
+        let edition = probe?.edition ?? .bedrock
+
+        if let existingSourceID = existingSourceID(matching: normalizedURL) {
+            sourceCandidates.removeAll { sourceIdentityKey(for: $0.sourceRootURL) == sourceIdentityKey(for: normalizedURL) }
+            updateSource(existingSourceID) { source in
                 if source.bookmarkData == nil {
                     source.bookmarkData = bookmarkData
                 }
-                source.accessDescriptor = sourceAccessMethod.accessDescriptor(for: source)
+                source.accessDescriptor = SourceAccessDescriptor(
+                    accessorIdentifier: providerID,
+                    kind: .localFolder,
+                    refreshStrategy: .eagerFullScan
+                )
+                source.providerID = providerID
+                source.edition = edition
                 source.capabilities = source.origin.defaultCapabilities
+                if let probe {
+                    source.displayName = probe.displayName
+                    if let warning = probe.warnings.first {
+                        source.scanDiagnostic = warning
                     }
-            startScan(for: normalizedURL, mode: .fullScan)
-            return normalizedURL
+                }
+            }
+            startScan(for: existingSourceID, mode: .fullScan)
+            return existingSourceID
         }
 
-        let source = MinecraftSource(
+        var source = MinecraftSource(
             folderURL: normalizedURL,
             bookmarkData: bookmarkData,
             accessDescriptor: SourceAccessDescriptor(
-                accessorIdentifier: LocalFolderSourceAccess().accessorIdentifier,
+                accessorIdentifier: providerID,
                 kind: .localFolder,
                 refreshStrategy: .eagerFullScan
             )
         )
-        return addSource(source, shouldPersist: true, shouldScan: true)
+        source.providerID = providerID
+        source.edition = edition
+        source.displayName = probe?.displayName ?? normalizedURL.lastPathComponent
+        if let warning = probe?.warnings.first {
+            source.scanDiagnostic = warning
+        }
+        let sourceID = addSource(source, shouldPersist: true, shouldScan: true)
+        sourceCandidates.removeAll { sourceIdentityKey(for: $0.sourceRootURL) == sourceIdentityKey(for: sourceID) }
+        return sourceID
+    }
+
+    func addSource(candidate: SourceCandidate) async -> URL {
+        let normalizedURL = candidate.sourceRootURL.standardizedFileURL
+        let bookmarkData = securityScopedBookmarkData(for: normalizedURL)
+
+        if let existingSourceID = existingSourceID(matching: normalizedURL) {
+            updateSource(existingSourceID) { source in
+                if source.bookmarkData == nil {
+                    source.bookmarkData = bookmarkData
+                }
+                source.accessDescriptor = SourceAccessDescriptor(
+                    accessorIdentifier: candidate.providerID,
+                    kind: .localFolder,
+                    refreshStrategy: .eagerFullScan
+                )
+                source.providerID = candidate.providerID
+                source.edition = candidate.edition
+                source.displayName = candidate.displayName
+                source.capabilities = source.origin.defaultCapabilities
+            }
+            removeSourceCandidates(matching: candidate, sourceID: existingSourceID)
+            startScan(for: existingSourceID, mode: .fullScan)
+            return existingSourceID
+        }
+
+        var source = MinecraftSource(
+            folderURL: normalizedURL,
+            bookmarkData: bookmarkData,
+            accessDescriptor: SourceAccessDescriptor(
+                accessorIdentifier: candidate.providerID,
+                kind: .localFolder,
+                refreshStrategy: .eagerFullScan
+            )
+        )
+        source.providerID = candidate.providerID
+        source.edition = candidate.edition
+        source.displayName = candidate.displayName
+
+        let sourceID = addSource(source, shouldPersist: true, shouldScan: true)
+        removeSourceCandidates(matching: candidate, sourceID: sourceID)
+        return sourceID
     }
 
     @discardableResult
     func addSource(_ source: MinecraftSource, shouldPersist: Bool = false, shouldScan: Bool = true) -> URL {
-        if sources.contains(where: { $0.id == source.id }) {
-            updateSource(source.id) { existingSource in
+        if let existingSourceID = existingSourceID(matching: source.id) {
+            updateSource(existingSourceID) { existingSource in
                 existingSource.origin = source.origin
                 existingSource.accessDescriptor = source.accessDescriptor
+                existingSource.providerID = source.accessDescriptor.accessorIdentifier
+                existingSource.edition = source.edition
+                existingSource.accessStatus = source.origin.defaultAccessStatus(displayName: source.displayName)
                 existingSource.availability = source.availability
                 existingSource.capabilities = source.capabilities
                 if existingSource.bookmarkData == nil {
@@ -183,19 +291,22 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         } else {
             var resolvedSource = source
             resolvedSource.accessDescriptor = sourceAccessMethod.accessDescriptor(for: resolvedSource)
+            resolvedSource.providerID = resolvedSource.accessDescriptor.accessorIdentifier
+            resolvedSource.edition = source.edition
+            resolvedSource.accessStatus = resolvedSource.origin.defaultAccessStatus(displayName: resolvedSource.displayName)
             resolvedSource.capabilities = resolvedSource.origin.defaultCapabilities
             sources.append(resolvedSource)
             sources.sort { $0.displayName.localizedStandardCompare($1.displayName) == .orderedAscending }
         }
 
         if shouldPersist {
-            persistSourceIfAvailable(withID: source.id)
+            persistSourceIfAvailable(withID: existingSourceID(matching: source.id) ?? source.id)
         }
         if shouldScan {
-            startScan(for: source.id, mode: .fullScan)
+            startScan(for: existingSourceID(matching: source.id) ?? source.id, mode: .fullScan)
         }
 
-        return source.id
+        return existingSourceID(matching: source.id) ?? source.id
     }
 
     func source(withID sourceID: URL) -> MinecraftSource? {
@@ -210,6 +321,42 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         startScan(for: sourceID, mode: .fullScan)
     }
 
+    func discoverSourceCandidates() {
+        candidateDiscoveryTask?.cancel()
+        isDiscoveringSourceCandidates = true
+        sourceCandidates.removeAll { candidateAlreadyAdded($0) }
+
+        let task = Task { [weak self] in
+            guard let self else {
+                return
+            }
+
+            defer {
+                self.isDiscoveringSourceCandidates = false
+                self.candidateDiscoveryTask = nil
+            }
+
+            do {
+                for try await event in self.sourceAccessMethod.discoverSourceCandidates() {
+                    guard !Task.isCancelled else {
+                        return
+                    }
+
+                    switch event {
+                    case .candidate(let candidate):
+                        self.recordSourceCandidate(candidate)
+                    case .stageUpdated, .warning:
+                        break
+                    }
+                }
+            } catch {
+                return
+            }
+        }
+
+        candidateDiscoveryTask = task
+    }
+
     func listContents(for item: MinecraftContentItem, in source: MinecraftSource) async throws -> [DirectoryEntry] {
         try await sourceAccessMethod.listItemContents(for: item, in: source)
     }
@@ -320,6 +467,7 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
             source.worldPackRelationships = index.worldPackRelationships
             source.displayItems = index.displayItems
             source.displayItemCountsByType = index.displayItemCountsByType
+            source.displayItemCountsByKind = index.displayItemCountsByKind
         }
     }
 
@@ -362,6 +510,7 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         updateSource(sourceID) { source in
             source.displayItems = snapshot.displayItems
             source.displayItemCountsByType = snapshot.displayItemCountsByType
+            source.displayItemCountsByKind = snapshot.displayItemCountsByKind
             source.rawItems = snapshot.rawItems
             source.logicalPacks = snapshot.logicalPacks
             source.logicalWorlds = snapshot.logicalWorlds
@@ -432,8 +581,13 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
         await ConnectedDeviceRuntime.refreshDevices(on: self, using: connectedDeviceAccessMethod)
     }
 
-    func currentCollectionSnapshots(for sourceURL: URL) -> [CollectionSnapshot] {
-        WorldScanner.collectionSnapshots(in: sourceURL)
+    func currentCollectionSnapshots(for sourceURL: URL, edition: MinecraftEdition) -> [CollectionSnapshot] {
+        switch edition {
+        case .bedrock:
+            return WorldScanner.collectionSnapshots(in: sourceURL)
+        case .java:
+            return JavaContentScanner.collectionSnapshots(in: sourceURL)
+        }
     }
 
     func connectedDeviceDisplayName(for device: ConnectedDevice, container: DeviceAppContainer) -> String {
@@ -523,6 +677,54 @@ final class SourceLibrary: ObservableObject, SourceScanSessionHosting, SourcePer
             }
         }
         sourceIDByItemID = itemIndex
+        sourceCandidates.removeAll { candidateAlreadyAdded($0) }
+    }
+
+    private func recordSourceCandidate(_ candidate: SourceCandidate) {
+        guard !candidateAlreadyAdded(candidate) else {
+            return
+        }
+
+        if let existingIndex = sourceCandidates.firstIndex(where: { $0.id == candidate.id }) {
+            if candidate.confidence > sourceCandidates[existingIndex].confidence {
+                sourceCandidates[existingIndex] = candidate
+            }
+        } else {
+            sourceCandidates.append(candidate)
+        }
+
+        sourceCandidates.sort {
+            if $0.confidence != $1.confidence {
+                return $0.confidence > $1.confidence
+            }
+
+            return $0.displayName.localizedStandardCompare($1.displayName) == .orderedAscending
+        }
+    }
+
+    private func candidateAlreadyAdded(_ candidate: SourceCandidate) -> Bool {
+        sources.contains { source in
+            sourceIdentityKey(for: source.id) == sourceIdentityKey(for: candidate.sourceRootURL)
+                || sourceIdentityKey(for: source.folderURL) == sourceIdentityKey(for: candidate.sourceRootURL)
+        }
+    }
+
+    private func existingSourceID(matching url: URL) -> URL? {
+        let identity = sourceIdentityKey(for: url)
+        return sources.first { source in
+            sourceIdentityKey(for: source.id) == identity
+                || sourceIdentityKey(for: source.folderURL) == identity
+        }?.id
+    }
+
+    private func removeSourceCandidates(matching candidate: SourceCandidate, sourceID: URL) {
+        let candidateIdentity = sourceIdentityKey(for: candidate.sourceRootURL)
+        let sourceIdentity = sourceIdentityKey(for: sourceID)
+        sourceCandidates.removeAll {
+            $0.id == candidate.id
+                || sourceIdentityKey(for: $0.sourceRootURL) == candidateIdentity
+                || sourceIdentityKey(for: $0.sourceRootURL) == sourceIdentity
+        }
     }
 
     @discardableResult

World Manager for Minecraft/Services/Sources/Local/SourceLocalRuntime.swift

@@ -12,7 +12,7 @@ protocol LocalSourceRuntimeHosting: AnyObject {
     func source(withID sourceID: URL) -> MinecraftSource?
     func updateAvailability(for sourceID: URL, to newAvailability: SourceAvailability) -> (previous: SourceAvailability, becameAvailable: Bool)
     func queueAutomaticSync(for sourceID: URL, reason: String, debounce: TimeInterval?)
-    func currentCollectionSnapshots(for sourceURL: URL) -> [CollectionSnapshot]
+    func currentCollectionSnapshots(for sourceURL: URL, edition: MinecraftEdition) -> [CollectionSnapshot]
 }
 
 enum LocalSourceRuntime {
@@ -86,7 +86,7 @@ enum LocalSourceRuntime {
 
             if SourceRestoration.needsReconcile(
                 refreshedSource,
-                currentCollectionSnapshots: host.currentCollectionSnapshots(for:)
+                currentCollectionSnapshots: host.currentCollectionSnapshots(for:edition:)
             ) {
                 host.queueAutomaticSync(
                     for: sourceID,

World Manager for Minecraft/Services/Sources/Persistence/SourcePersistenceCoordinator.swift

@@ -15,7 +15,7 @@ protocol SourcePersistenceHosting: AnyObject {
     func refreshConnectedDevices() async
     func refreshLocalSources() async
     func queueAutomaticSync(for sourceID: URL, reason: String, debounce: TimeInterval?)
-    func currentCollectionSnapshots(for sourceURL: URL) -> [CollectionSnapshot]
+    func currentCollectionSnapshots(for sourceURL: URL, edition: MinecraftEdition) -> [CollectionSnapshot]
     func connectedDeviceDisplayName(for device: ConnectedDevice, container: DeviceAppContainer) -> String
 }
 
@@ -125,7 +125,7 @@ enum SourcePersistenceCoordinator {
             if let refreshReason = SourceRestoration.startupRefreshReason(
                 for: source,
                 persistedRecord: persistedRecordsByID[source.id],
-                currentCollectionSnapshots: host.currentCollectionSnapshots(for:)
+                currentCollectionSnapshots: host.currentCollectionSnapshots(for:edition:)
             ) {
                 host.queueAutomaticSync(for: source.id, reason: refreshReason, debounce: nil)
             }

World Manager for Minecraft/Services/Sources/Persistence/SourceRestoration.swift

@@ -16,6 +16,8 @@ enum SourceRestoration {
             accessDescriptor: record.accessDescriptor,
             availability: record.availability
         )
+        source.providerID = record.accessDescriptor.accessorIdentifier
+        source.edition = edition(for: record.accessDescriptor, origin: record.origin)
 
         if case .connectedDevice(let device, let container) = source.origin {
             var repairedDevice = device
@@ -56,6 +58,9 @@ enum SourceRestoration {
         source.displayItemCountsByType = items.reduce(into: [MinecraftContentType: Int]()) { counts, item in
             counts[item.contentType, default: 0] += 1
         }
+        source.displayItemCountsByKind = items.reduce(into: [MinecraftContentKind: Int]()) { counts, item in
+            counts[item.contentKind, default: 0] += 1
+        }
         source.indexedItemCount = items.count
         source.indexedDetailCount = items.filter(\.metadataLoaded).count
         source.previewLoadedCount = items.filter(\.previewLoaded).count
@@ -101,7 +106,7 @@ enum SourceRestoration {
     static func startupRefreshReason(
         for source: MinecraftSource,
         persistedRecord: PersistedSourceRecord?,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> String? {
         guard source.availability == .available else {
             return nil
@@ -130,7 +135,7 @@ enum SourceRestoration {
 
     static func needsReconcile(
         _ source: MinecraftSource,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> Bool {
         reconcileIsNeeded(source, currentCollectionSnapshots: currentCollectionSnapshots)
     }
@@ -149,7 +154,7 @@ enum SourceRestoration {
 
     private static func needsRescan(
         _ record: PersistedSourceRecord,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> Bool {
         guard record.accessDescriptor.refreshStrategy == .eagerFullScan else {
             return record.rawItems.isEmpty
@@ -164,15 +169,16 @@ enum SourceRestoration {
             return true
         }
 
+        let edition = edition(for: record.accessDescriptor, origin: record.origin)
         return collectionsDiffer(
-            currentCollectionSnapshots(sourceURL),
+            currentCollectionSnapshots(sourceURL, edition),
             persistedCollections: snapshot.collectionSnapshots
         )
     }
 
     private static func reconcileIsNeeded(
         _ source: MinecraftSource,
-        currentCollectionSnapshots: (URL) -> [CollectionSnapshot]
+        currentCollectionSnapshots: (URL, MinecraftEdition) -> [CollectionSnapshot]
     ) -> Bool {
         guard source.accessDescriptor.refreshStrategy == .eagerFullScan else {
             return source.rawItems.isEmpty
@@ -188,29 +194,38 @@ enum SourceRestoration {
         }
 
         return collectionsDiffer(
-            currentCollectionSnapshots(sourceURL),
+            currentCollectionSnapshots(sourceURL, source.edition),
             persistedCollections: snapshot.collectionSnapshots
         )
     }
 
+    private static func edition(
+        for accessDescriptor: SourceAccessDescriptor,
+        origin: MinecraftSourceOrigin
+    ) -> MinecraftEdition {
+        if accessDescriptor.accessorIdentifier == JavaLocalFolderSourceAccess().accessorIdentifier {
+            return .java
+        }
+
+        return origin.defaultEdition
+    }
+
     private static func collectionsDiffer(
         _ currentCollections: [CollectionSnapshot],
         persistedCollections: [CollectionSnapshot]
     ) -> Bool {
-        let currentCollectionsByName = Dictionary(
-            uniqueKeysWithValues: currentCollections.map { ($0.folderName, $0) }
-        )
-        let persistedCollectionsByName = Dictionary(
-            uniqueKeysWithValues: persistedCollections.map { ($0.folderName, $0) }
-        )
+        let currentCollectionsByName = Dictionary(grouping: currentCollections, by: \.folderName)
+            .mapValues { $0.map(\.fingerprint).sorted() }
+        let persistedCollectionsByName = Dictionary(grouping: persistedCollections, by: \.folderName)
+            .mapValues { $0.map(\.fingerprint).sorted() }
 
         if currentCollectionsByName.count != persistedCollectionsByName.count {
             return true
         }
 
-        for (folderName, persistedCollection) in persistedCollectionsByName {
-            guard let currentCollection = currentCollectionsByName[folderName],
-                  currentCollection.fingerprint == persistedCollection.fingerprint else {
+        for (folderName, persistedFingerprints) in persistedCollectionsByName {
+            guard let currentFingerprints = currentCollectionsByName[folderName],
+                  currentFingerprints == persistedFingerprints else {
                 return true
             }
         }

World Manager for Minecraft/Services/Sources/Scanning/SourceContentIndex.swift

@@ -11,6 +11,7 @@ struct SourceContentIndex {
     let worldPackRelationships: [WorldPackRelationship]
     let displayItems: [MinecraftContentItem]
     let displayItemCountsByType: [MinecraftContentType: Int]
+    let displayItemCountsByKind: [MinecraftContentKind: Int]
 }
 
 enum SourceContentIndexer {
@@ -171,7 +172,8 @@ enum SourceContentIndexer {
             packInstances: sortedPackInstances,
             worldPackRelationships: worldRelationships,
             displayItems: displayItems,
-            displayItemCountsByType: displayItemCounts(for: displayItems)
+            displayItemCountsByType: displayItemCounts(for: displayItems),
+            displayItemCountsByKind: displayItemKindCounts(for: displayItems)
         )
     }
 
@@ -219,6 +221,12 @@ enum SourceContentIndexer {
         }
     }
 
+    private static func displayItemKindCounts(for items: [MinecraftContentItem]) -> [MinecraftContentKind: Int] {
+        items.reduce(into: [MinecraftContentKind: Int]()) { counts, item in
+            counts[item.contentKind, default: 0] += 1
+        }
+    }
+
     private static func shouldPreferPackItem(_ candidate: MinecraftContentItem, over existing: MinecraftContentItem) -> Bool {
         let candidateEmbedded = isEmbeddedWorldPack(candidate)
         let existingEmbedded = isEmbeddedWorldPack(existing)

World Manager for Minecraft/Services/Sources/Scanning/SourceScanExecution.swift

@@ -50,9 +50,10 @@ enum SourceScanExecutor {
         host.updateSource(sourceID) { source in
             source.accessDescriptor = sourceAccessMethod.accessDescriptor(for: source)
         }
-        let currentAvailability = await sourceAccessMethod.availability(for: source)
+        let currentAccessStatus = await sourceAccessMethod.accessStatus(for: source)
         host.updateSource(sourceID) { source in
-            source.availability = currentAvailability
+            source.accessStatus = currentAccessStatus
+            source.availability = currentAccessStatus.availability
         }
 
         let scanContextURL = source.folderURL
@@ -89,22 +90,7 @@ enum SourceScanExecutor {
                     }
                 }
             }
-            let discoveryStream = AsyncThrowingStream<MinecraftContentItem, Error> { continuation in
-                let discoveryTask = Task.detached(priority: .userInitiated) {
-                    do {
-                        try await sourceAccessMethod.discoverItems(for: source, mode: mode) { item in
-                            continuation.yield(item)
-                        }
-                        continuation.finish()
-                    } catch {
-                        continuation.finish(throwing: error)
-                    }
-                }
-
-                continuation.onTermination = { @Sendable _ in
-                    discoveryTask.cancel()
-                }
-            }
+            let providerEventStream = sourceAccessMethod.scanEvents(for: source, mode: mode)
 
             let previousItemsByID = Dictionary(uniqueKeysWithValues: previousSource.rawItems.map { ($0.id, $0) })
             let previousSnapshotByItemID = Dictionary(
@@ -116,11 +102,36 @@ enum SourceScanExecutor {
             var discoveredCollectionNames = Set<String>()
             let discoveryStartTime = Date()
 
-            for try await item in discoveryStream {
+            for try await event in providerEventStream {
                 guard !Task.isCancelled else {
                     break
                 }
 
+                switch event {
+                case .accessStatusChanged(let accessStatus):
+                    host.updateSource(sourceID) { source in
+                        source.accessStatus = accessStatus
+                        source.availability = accessStatus.availability
+                    }
+                    continue
+                case .stageUpdated(let stage):
+                    host.updateSource(sourceID) { source in
+                        source.scanStatus = stage.detail ?? stage.title
+                    }
+                    continue
+                case .warning(let warning):
+                    host.updateSource(sourceID) { source in
+                        source.scanDiagnostic = warning.detail ?? warning.message
+                    }
+                    continue
+                case .inspected(let inspectedItem):
+                    if let snapshot = await index.applyEnrichedItem(inspectedItem) {
+                        await MainActor.run {
+                            host.applySnapshot(snapshot, to: sourceID)
+                        }
+                    }
+                    continue
+                case .discovered(let item):
                     discoveredCount += 1
                     discoveredCollectionNames.insert(item.collectionRootURL.lastPathComponent)
                     let itemForIndex: MinecraftContentItem
@@ -147,6 +158,7 @@ enum SourceScanExecutor {
                         await enrichmentQueue.enqueue(item)
                     }
                 }
+            }
 
             if mode == .reconcile, source.origin.kind == .connectedDevice {
                 let cachedItemsByCollection = Dictionary(grouping: previousSource.rawItems) { item in
@@ -464,6 +476,7 @@ private actor EnrichmentWorkQueue {
 struct SourceIndexSnapshot {
     let displayItems: [MinecraftContentItem]
     let displayItemCountsByType: [MinecraftContentType: Int]
+    let displayItemCountsByKind: [MinecraftContentKind: Int]
     let rawItems: [MinecraftContentItem]
     let logicalPacks: [LogicalPack]
     let logicalWorlds: [LogicalWorld]
@@ -631,6 +644,9 @@ private actor SourceIndexActor {
         let displayItemCountsByType = dedupedDisplayItems.reduce(into: [MinecraftContentType: Int]()) { counts, item in
             counts[item.contentType, default: 0] += 1
         }
+        let displayItemCountsByKind = dedupedDisplayItems.reduce(into: [MinecraftContentKind: Int]()) { counts, item in
+            counts[item.contentKind, default: 0] += 1
+        }
         let metadataFraction = progressFraction(completed: indexedDetailCount, total: indexedItemCount)
         let previewFraction = progressFraction(completed: previewLoadedCount, total: indexedItemCount)
         let sizeFraction = progressFraction(completed: sizeLoadedCount, total: indexedItemCount)
@@ -652,6 +668,7 @@ private actor SourceIndexActor {
             return SourceIndexSnapshot(
                 displayItems: dedupedDisplayItems,
                 displayItemCountsByType: displayItemCountsByType,
+                displayItemCountsByKind: displayItemCountsByKind,
                 rawItems: rawItems,
                 logicalPacks: logicalPacks,
                 logicalWorlds: [],
@@ -680,6 +697,7 @@ private actor SourceIndexActor {
             return SourceIndexSnapshot(
                 displayItems: dedupedDisplayItems,
                 displayItemCountsByType: displayItemCountsByType,
+                displayItemCountsByKind: displayItemCountsByKind,
                 rawItems: rawItems,
                 logicalPacks: logicalPacks,
                 logicalWorlds: [],
@@ -712,6 +730,7 @@ private actor SourceIndexActor {
             return SourceIndexSnapshot(
                 displayItems: dedupedDisplayItems,
                 displayItemCountsByType: displayItemCountsByType,
+                displayItemCountsByKind: displayItemCountsByKind,
                 rawItems: rawItems,
                 logicalPacks: logicalPacks,
                 logicalWorlds: [],
@@ -824,6 +843,7 @@ private actor SourceIndexActor {
         return SourceIndexSnapshot(
             displayItems: dedupedDisplayItems,
             displayItemCountsByType: displayItemCountsByType,
+            displayItemCountsByKind: displayItemCountsByKind,
             rawItems: rawItems,
             logicalPacks: logicalPacks,
             logicalWorlds: logicalWorlds,

World Manager for Minecraft/Services/Sources/Scanning/SourceScanning.swift

@@ -6,9 +6,9 @@ import Foundation
 enum SourceScanPolicy {
     static func initialStatus(for source: MinecraftSource, mode: SourceDiscoveryMode) -> String {
         switch (source.origin, mode) {
-        case (.localFolder, .fullScan):
+        case (.localFolder, .fullScan), (.javaLocalFolder, .fullScan):
             return "Preparing folder scan..."
-        case (.localFolder, .reconcile):
+        case (.localFolder, .reconcile), (.javaLocalFolder, .reconcile):
             return "Preparing cached library refresh..."
         case (.connectedDevice, .fullScan):
             return "Connecting to device and discovering Minecraft items..."
@@ -19,9 +19,9 @@ enum SourceScanPolicy {
 
     static func scanningLibraryStatus(for source: MinecraftSource, mode: SourceDiscoveryMode) -> String {
         switch (source.origin, mode) {
-        case (.localFolder, .fullScan):
+        case (.localFolder, .fullScan), (.javaLocalFolder, .fullScan):
             return "Scanning Minecraft library..."
-        case (.localFolder, .reconcile):
+        case (.localFolder, .reconcile), (.javaLocalFolder, .reconcile):
             return "Reconciling cached library..."
         case (.connectedDevice, .fullScan):
             return "Scanning Minecraft library on device..."
@@ -32,7 +32,7 @@ enum SourceScanPolicy {
 
     static func performanceContext(for source: MinecraftSource) -> String {
         switch source.origin {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             return "source=\(source.displayName) kind=local"
         case .connectedDevice(let device, let container):
             let transport = device.connection == .usb ? "usb" : "network"
@@ -121,7 +121,13 @@ enum SourceScanPolicy {
     }
 
     static func buildSnapshot(for source: MinecraftSource, scanRootURL: URL) -> SourceSnapshot {
-        let collectionSnapshots = WorldScanner.collectionSnapshots(in: scanRootURL)
+        let collectionSnapshots: [CollectionSnapshot]
+        switch source.edition {
+        case .bedrock:
+            collectionSnapshots = WorldScanner.collectionSnapshots(in: scanRootURL)
+        case .java:
+            collectionSnapshots = JavaContentScanner.collectionSnapshots(in: scanRootURL)
+        }
 
         let itemSnapshots = source.rawItems.map { item in
             ItemSnapshot(
@@ -153,6 +159,7 @@ enum SourceScanRecovery {
     static func restoreIndexedState(from previousSource: MinecraftSource, into source: inout MinecraftSource) {
         source.displayItems = previousSource.displayItems
         source.displayItemCountsByType = previousSource.displayItemCountsByType
+        source.displayItemCountsByKind = previousSource.displayItemCountsByKind
         source.rawItems = previousSource.rawItems
         source.logicalPacks = previousSource.logicalPacks
         source.logicalWorlds = previousSource.logicalWorlds

World Manager for Minecraft/SourceAccess/ConnectedDevice/AppleMobileDevice/AppleMobileDeviceSourceAccess.swift

@@ -18,26 +18,68 @@ struct AppleMobileDeviceSourceAccess: ConnectedDeviceSourceAccessMethod {
     }
 
     nonisolated func availability(for source: MinecraftSource) async -> SourceAvailability {
-        guard case .connectedDevice(let expectedDevice, _) = source.origin else {
-            return .unavailable
+        await accessStatus(for: source).availability
     }
 
+    nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus {
+        guard case .connectedDevice(let expectedDevice, _) = source.origin else {
+            return SourceAccessStatus(
+                availability: .unavailable,
+                mode: .unknown,
+                displayName: source.displayName,
+                iconSystemName: "iphone.gen3",
+                statusText: "Device source unavailable",
+                warningText: nil
+            )
+        }
+
+        let fallbackMode: SourceAccessMode = expectedDevice.connection == .usb ? .usbDevice : .networkDevice
+
         do {
             let devices = try await listConnectedDevices()
             guard let device = devices.first(where: { $0.udid == expectedDevice.udid }) else {
-                return .disconnected
+                return SourceAccessStatus(
+                    availability: .disconnected,
+                    mode: fallbackMode,
+                    displayName: source.displayName,
+                    iconSystemName: "iphone.gen3",
+                    statusText: "Device disconnected",
+                    warningText: nil
+                )
             }
 
+            let mode: SourceAccessMode = device.connection == .usb ? .usbDevice : .networkDevice
+            let availability: SourceAvailability
+            let statusText: String?
             switch device.trustState {
             case .trusted:
-                return .available
+                availability = .available
+                statusText = nil
             case .locked, .untrusted:
-                return .limited
+                availability = .limited
+                statusText = "Unlock and trust the device"
             case .unavailable:
-                return .disconnected
+                availability = .disconnected
+                statusText = "Device unavailable"
             }
+
+            return SourceAccessStatus(
+                availability: availability,
+                mode: mode,
+                displayName: device.name,
+                iconSystemName: "iphone.gen3",
+                statusText: statusText,
+                warningText: nil
+            )
         } catch {
-            return .disconnected
+            return SourceAccessStatus(
+                availability: .disconnected,
+                mode: fallbackMode,
+                displayName: source.displayName,
+                iconSystemName: "iphone.gen3",
+                statusText: "Device status unavailable",
+                warningText: error.localizedDescription
+            )
         }
     }
 

World Manager for Minecraft/SourceAccess/Core/SourceAccessCoordinator.swift

@@ -10,7 +10,10 @@ enum SourceDiscoveryMode: Sendable {
 
 protocol SourceAccessMethod: Sendable {
     nonisolated var accessorIdentifier: SourceAccessorIdentifier { get }
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult?
+    nonisolated func discoverSourceCandidates() -> AsyncThrowingStream<SourceCandidateEvent, Error>
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor
+    nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus
     nonisolated func availability(for source: MinecraftSource) async -> SourceAvailability
     nonisolated func capabilities(for source: MinecraftSource) async -> SourceCapabilities
     nonisolated func discoverItems(
@@ -18,6 +21,10 @@ protocol SourceAccessMethod: Sendable {
         mode: SourceDiscoveryMode,
         onDiscovered: @escaping @Sendable (MinecraftContentItem) -> Void
     ) async throws
+    nonisolated func scanEvents(
+        for source: MinecraftSource,
+        mode: SourceDiscoveryMode
+    ) -> AsyncThrowingStream<ProviderEvent, Error>
     nonisolated func enrich(_ item: MinecraftContentItem, for source: MinecraftSource) async -> MinecraftContentItem
     nonisolated func loadPreviewAssets(for item: MinecraftContentItem, in source: MinecraftSource) async -> MinecraftContentItem
     nonisolated func loadPreviewAssets(for items: [MinecraftContentItem], in source: MinecraftSource) async -> [MinecraftContentItem]
@@ -33,6 +40,17 @@ extension SourceAccessMethod {
         String(reflecting: Self.self)
     }
 
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        _ = url
+        return nil
+    }
+
+    nonisolated func discoverSourceCandidates() -> AsyncThrowingStream<SourceCandidateEvent, Error> {
+        AsyncThrowingStream { continuation in
+            continuation.finish()
+        }
+    }
+
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor {
         SourceAccessDescriptor(
             accessorIdentifier: accessorIdentifier,
@@ -42,8 +60,13 @@ extension SourceAccessMethod {
     }
 
     nonisolated func availability(for source: MinecraftSource) async -> SourceAvailability {
-        _ = source
-        return .unknown
+        await accessStatus(for: source).availability
+    }
+
+    nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus {
+        var status = source.origin.defaultAccessStatus(displayName: source.displayName)
+        status.availability = .unknown
+        return status
     }
 
     nonisolated func capabilities(for source: MinecraftSource) async -> SourceCapabilities {
@@ -60,6 +83,64 @@ extension SourceAccessMethod {
         _ = onDiscovered
     }
 
+    nonisolated func scanEvents(
+        for source: MinecraftSource,
+        mode: SourceDiscoveryMode
+    ) -> AsyncThrowingStream<ProviderEvent, Error> {
+        AsyncThrowingStream { continuation in
+            let task = Task.detached(priority: .userInitiated) {
+                let accessStatus = await accessStatus(for: source)
+                continuation.yield(.accessStatusChanged(accessStatus))
+                continuation.yield(
+                    .stageUpdated(
+                        WorkStage(
+                            id: "discovery",
+                            title: "Discovering content",
+                            detail: nil,
+                            state: .running,
+                            progress: .indeterminate
+                        )
+                    )
+                )
+
+                do {
+                    try await discoverItems(for: source, mode: mode) { item in
+                        continuation.yield(.discovered(item))
+                    }
+                    continuation.yield(
+                        .stageUpdated(
+                            WorkStage(
+                                id: "discovery",
+                                title: "Discovering content",
+                                detail: nil,
+                                state: .succeeded,
+                                progress: .indeterminate
+                            )
+                        )
+                    )
+                    continuation.finish()
+                } catch {
+                    continuation.yield(
+                        .stageUpdated(
+                            WorkStage(
+                                id: "discovery",
+                                title: "Discovering content",
+                                detail: error.localizedDescription,
+                                state: .failed,
+                                progress: .indeterminate
+                            )
+                        )
+                    )
+                    continuation.finish(throwing: error)
+                }
+            }
+
+            continuation.onTermination = { @Sendable _ in
+                task.cancel()
+            }
+        }
+    }
+
     nonisolated func enrich(_ item: MinecraftContentItem, for source: MinecraftSource) async -> MinecraftContentItem {
         _ = source
         return item
@@ -123,9 +204,10 @@ struct SourceAccessCoordinator: SourceAccessMethod {
 
     nonisolated init(
         localFolderAccess: SourceAccessMethod = LocalFolderSourceAccess(),
+        javaLocalFolderAccess: SourceAccessMethod = JavaLocalFolderSourceAccess(),
         connectedDeviceAccess: ConnectedDeviceSourceAccessMethod
     ) {
-        self.init(accessMethods: [localFolderAccess, connectedDeviceAccess])
+        self.init(accessMethods: [localFolderAccess, javaLocalFolderAccess, connectedDeviceAccess])
     }
 
     nonisolated init(accessMethods: [any SourceAccessMethod]) {
@@ -152,6 +234,64 @@ struct SourceAccessCoordinator: SourceAccessMethod {
         fatalError("No source access method is registered for \(source.accessDescriptor.accessorIdentifier).")
     }
 
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        var bestProbe: SourceProbeResult?
+
+        for accessMethod in accessMethodsByIdentifier.values {
+            guard let probe = await accessMethod.probeLocalFolder(url) else {
+                continue
+            }
+
+            guard probe.confidence > .none else {
+                continue
+            }
+
+            if let currentBest = bestProbe {
+                if probe.confidence > currentBest.confidence {
+                    bestProbe = probe
+                }
+            } else {
+                bestProbe = probe
+            }
+        }
+
+        return bestProbe
+    }
+
+    nonisolated func discoverSourceCandidates() -> AsyncThrowingStream<SourceCandidateEvent, Error> {
+        AsyncThrowingStream { continuation in
+            let accessMethods = Array(accessMethodsByIdentifier.values)
+            let task = Task.detached(priority: .userInitiated) {
+                await withTaskGroup(of: Void.self) { group in
+                    for accessMethod in accessMethods {
+                        group.addTask {
+                            do {
+                                for try await event in accessMethod.discoverSourceCandidates() {
+                                    continuation.yield(event)
+                                }
+                            } catch {
+                                continuation.yield(
+                                    .warning(
+                                        ProviderWarning(
+                                            id: "\(accessMethod.accessorIdentifier)-candidate-discovery-failed",
+                                            message: "Source discovery failed",
+                                            detail: error.localizedDescription
+                                        )
+                                    )
+                                )
+                            }
+                        }
+                    }
+                }
+                continuation.finish()
+            }
+
+            continuation.onTermination = { @Sendable _ in
+                task.cancel()
+            }
+        }
+    }
+
     nonisolated func discoverItems(
         for source: MinecraftSource,
         mode: SourceDiscoveryMode,
@@ -164,6 +304,13 @@ struct SourceAccessCoordinator: SourceAccessMethod {
         )
     }
 
+    nonisolated func scanEvents(
+        for source: MinecraftSource,
+        mode: SourceDiscoveryMode
+    ) -> AsyncThrowingStream<ProviderEvent, Error> {
+        accessMethod(for: source).scanEvents(for: source, mode: mode)
+    }
+
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor {
         accessMethod(for: source).accessDescriptor(for: source)
     }
@@ -172,6 +319,10 @@ struct SourceAccessCoordinator: SourceAccessMethod {
         return await accessMethod(for: source).availability(for: source)
     }
 
+    nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus {
+        return await accessMethod(for: source).accessStatus(for: source)
+    }
+
     nonisolated func capabilities(for source: MinecraftSource) async -> SourceCapabilities {
         return await accessMethod(for: source).capabilities(for: source)
     }

World Manager for Minecraft/SourceAccess/LocalFolder/LocalFolderSourceAccess.swift

@@ -3,11 +3,17 @@
 
 import Foundation
 
-struct LocalFolderSourceAccess: SourceAccessMethod {
+typealias LocalFolderSourceAccess = BedrockLocalFolderSourceAccess
+
+struct BedrockLocalFolderSourceAccess: SourceAccessMethod {
     nonisolated let accessorIdentifier: SourceAccessorIdentifier = "local-folder"
 
     nonisolated init() {}
 
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        BedrockContentScanner.probeLocalFolder(url, providerID: accessorIdentifier)
+    }
+
     nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor {
         _ = source
         return SourceAccessDescriptor(
@@ -18,9 +24,15 @@ struct LocalFolderSourceAccess: SourceAccessMethod {
     }
 
     nonisolated func availability(for source: MinecraftSource) async -> SourceAvailability {
+        await accessStatus(for: source).availability
+    }
+
+    nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus {
         let candidateURL: URL
+        let mode: SourceAccessMode
         if case .localFolder(let bookmarkData) = source.origin,
            let bookmarkData {
+            mode = .securityScopedLocalFolder
             var isStale = false
             if let resolvedURL = try? URL(
                 resolvingBookmarkData: bookmarkData,
@@ -33,10 +45,19 @@ struct LocalFolderSourceAccess: SourceAccessMethod {
                 candidateURL = source.folderURL
             }
         } else {
+            mode = .localFileSystem
             candidateURL = source.folderURL
         }
 
-        return FileManager.default.fileExists(atPath: candidateURL.path) ? .available : .unavailable
+        let availability: SourceAvailability = FileManager.default.fileExists(atPath: candidateURL.path) ? .available : .unavailable
+        return SourceAccessStatus(
+            availability: availability,
+            mode: mode,
+            displayName: source.displayName,
+            iconSystemName: "folder",
+            statusText: availability == .available ? nil : "Folder unavailable",
+            warningText: nil
+        )
     }
 
     nonisolated func capabilities(for source: MinecraftSource) async -> SourceCapabilities {
@@ -191,3 +212,185 @@ struct LocalFolderSourceAccess: SourceAccessMethod {
         return components.first.map(String.init)
     }
 }
+
+struct JavaLocalFolderSourceAccess: SourceAccessMethod {
+    nonisolated let accessorIdentifier: SourceAccessorIdentifier = "java-local-folder"
+    private let candidateDiscoveryRoots: [URL]?
+
+    nonisolated init(candidateDiscoveryRoots: [URL]? = nil) {
+        self.candidateDiscoveryRoots = candidateDiscoveryRoots
+    }
+
+    nonisolated func probeLocalFolder(_ url: URL) async -> SourceProbeResult? {
+        JavaContentScanner.probeLocalFolder(url, providerID: accessorIdentifier)
+    }
+
+    nonisolated func discoverSourceCandidates() -> AsyncThrowingStream<SourceCandidateEvent, Error> {
+        AsyncThrowingStream { continuation in
+            let roots = candidateDiscoveryRoots
+            let providerID = accessorIdentifier
+            let task = Task.detached(priority: .utility) {
+                continuation.yield(
+                    .stageUpdated(
+                        WorkStage(
+                            id: "\(providerID)-candidate-discovery",
+                            title: "Finding Java sources",
+                            detail: nil,
+                            state: .running,
+                            progress: .indeterminate
+                        )
+                    )
+                )
+
+                let candidates = JavaContentScanner.discoverSourceCandidates(
+                    providerID: providerID,
+                    searchRoots: roots
+                )
+                for candidate in candidates {
+                    continuation.yield(.candidate(candidate))
+                }
+
+                continuation.yield(
+                    .stageUpdated(
+                        WorkStage(
+                            id: "\(providerID)-candidate-discovery",
+                            title: "Finding Java sources",
+                            detail: candidates.isEmpty ? "No Java sources found." : "Found \(candidates.count) Java sources.",
+                            state: .succeeded,
+                            progress: .indeterminate
+                        )
+                    )
+                )
+                continuation.finish()
+            }
+
+            continuation.onTermination = { @Sendable _ in
+                task.cancel()
+            }
+        }
+    }
+
+    nonisolated func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor {
+        _ = source
+        return SourceAccessDescriptor(
+            accessorIdentifier: accessorIdentifier,
+            kind: .localFolder,
+            refreshStrategy: .eagerFullScan
+        )
+    }
+
+    nonisolated func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus {
+        let candidateURL: URL
+        let mode: SourceAccessMode
+        let bookmarkData: Data?
+        switch source.origin {
+        case .javaLocalFolder(let data), .localFolder(let data):
+            bookmarkData = data
+        case .connectedDevice:
+            bookmarkData = nil
+        }
+
+        if let bookmarkData {
+            mode = .securityScopedLocalFolder
+            var isStale = false
+            if let resolvedURL = try? URL(
+                resolvingBookmarkData: bookmarkData,
+                options: [.withSecurityScope],
+                relativeTo: nil,
+                bookmarkDataIsStale: &isStale
+            ) {
+                candidateURL = resolvedURL.standardizedFileURL
+            } else {
+                candidateURL = source.folderURL
+            }
+        } else {
+            mode = .localFileSystem
+            candidateURL = source.folderURL
+        }
+
+        let availability: SourceAvailability = FileManager.default.fileExists(atPath: candidateURL.path) ? .available : .unavailable
+        return SourceAccessStatus(
+            availability: availability,
+            mode: mode,
+            displayName: source.displayName,
+            iconSystemName: "folder",
+            statusText: availability == .available ? nil : "Folder unavailable",
+            warningText: nil
+        )
+    }
+
+    nonisolated func capabilities(for source: MinecraftSource) async -> SourceCapabilities {
+        _ = source
+        return .localFolder
+    }
+
+    nonisolated func discoverItems(
+        for source: MinecraftSource,
+        mode: SourceDiscoveryMode,
+        onDiscovered: @escaping @Sendable (MinecraftContentItem) -> Void
+    ) async throws {
+        _ = mode
+        let bookmarkData: Data?
+        switch source.origin {
+        case .javaLocalFolder(let data), .localFolder(let data):
+            bookmarkData = data
+        case .connectedDevice:
+            throw SourceAccessError.accessFailed(
+                reason: "No Java local-folder access method is configured for this source type."
+            )
+        }
+
+        let resolvedURL: URL
+        if let bookmarkData {
+            var isStale = false
+            guard let bookmarkURL = try? URL(
+                resolvingBookmarkData: bookmarkData,
+                options: [.withSecurityScope],
+                relativeTo: nil,
+                bookmarkDataIsStale: &isStale
+            ) else {
+                throw SourceAccessError.accessFailed(
+                    reason: "The saved folder bookmark could not be resolved."
+                )
+            }
+
+            resolvedURL = bookmarkURL.standardizedFileURL
+        } else {
+            resolvedURL = source.folderURL
+        }
+
+        let accessedSecurityScope = resolvedURL.startAccessingSecurityScopedResource()
+        defer {
+            if accessedSecurityScope {
+                resolvedURL.stopAccessingSecurityScopedResource()
+            }
+        }
+
+        _ = try JavaContentScanner.discoverItems(in: resolvedURL, onDiscovered: onDiscovered)
+    }
+
+    nonisolated func enrich(_ item: MinecraftContentItem, for source: MinecraftSource) async -> MinecraftContentItem {
+        _ = source
+        return await JavaContentScanner.enrich(item: item)
+    }
+
+    nonisolated func loadSize(for item: MinecraftContentItem, in source: MinecraftSource) async -> MinecraftContentItem {
+        _ = source
+        return JavaContentScanner.loadSize(for: item)
+    }
+
+    nonisolated func listItemContents(for item: MinecraftContentItem, in source: MinecraftSource) async throws -> [DirectoryEntry] {
+        _ = source
+        let values = try? item.folderURL.resourceValues(forKeys: [.isDirectoryKey])
+        guard values?.isDirectory == true else {
+            return []
+        }
+
+        return try await BedrockLocalFolderSourceAccess().listItemContents(for: item, in: source)
+    }
+
+    nonisolated func materializeItem(for item: MinecraftContentItem, in source: MinecraftSource) async throws -> URL {
+        _ = source
+        return item.folderURL
+    }
+}

World Manager for Minecraft/UI/Detail/ConnectedDeviceDetailView.swift

@@ -0,0 +1,133 @@
+// SPDX-FileCopyrightText: 2026 John Burwell and contributors
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import SwiftUI
+
+struct ConnectedDeviceDetailView: View {
+    let entry: ConnectedDeviceSidebarEntry
+    let addAction: (() -> Void)?
+
+    var body: some View {
+        ScrollView {
+            VStack(alignment: .leading, spacing: 24) {
+                VStack(alignment: .leading, spacing: 8) {
+                    Text(entry.device.name)
+                        .font(.largeTitle.weight(.semibold))
+
+                    Text("Available connected device")
+                        .foregroundStyle(.secondary)
+                }
+
+                if let addAction {
+                    Button("Add Source") {
+                        addAction()
+                    }
+                    .buttonStyle(.borderedProminent)
+                }
+
+                sourceSection(title: "Overview", rows: overviewRows)
+                sourceSection(title: "Minecraft Access", rows: minecraftRows)
+                sourceSection(title: "Technical Details", rows: technicalRows)
+            }
+            .frame(maxWidth: 760, alignment: .leading)
+            .padding(28)
+        }
+    }
+
+    private var overviewRows: [(String, String)] {
+        var rows: [(String, String)] = [
+            ("Connection", connectionLabel),
+            ("Trust State", trustStateLabel),
+            ("Availability", entry.hasMinecraftContainer ? "Ready to add" : "Not ready")
+        ]
+
+        if let productType = entry.device.productType, !productType.isEmpty {
+            rows.append(("Product Type", productType))
+        }
+        if let osVersion = entry.device.osVersion, !osVersion.isEmpty {
+            rows.append(("OS Version", osVersion))
+        }
+
+        return rows
+    }
+
+    private var minecraftRows: [(String, String)] {
+        if let error = entry.discoveryErrorDescription, !error.isEmpty {
+            return [("Discovery Error", error)]
+        }
+
+        guard let container = entry.minecraftContainer else {
+            return [("Minecraft Container", "Not found")]
+        }
+
+        var rows: [(String, String)] = [
+            ("Minecraft Container", container.appName),
+            ("App ID", container.appID),
+            ("Access Mode", container.accessMode.rawValue)
+        ]
+
+        if let relativePath = container.minecraftFolderRelativePath, !relativePath.isEmpty {
+            rows.append(("Minecraft Path", relativePath))
+        }
+
+        return rows
+    }
+
+    private var technicalRows: [(String, String)] {
+        [
+            ("UDID", entry.device.udid),
+            ("Device ID", entry.id)
+        ]
+    }
+
+    private var connectionLabel: String {
+        switch entry.device.connection {
+        case .usb:
+            return "USB"
+        case .network:
+            return "Network"
+        }
+    }
+
+    private var trustStateLabel: String {
+        switch entry.device.trustState {
+        case .trusted:
+            return "Trusted"
+        case .locked:
+            return "Locked"
+        case .untrusted:
+            return "Untrusted"
+        case .unavailable:
+            return "Unavailable"
+        }
+    }
+
+    @ViewBuilder
+    private func sourceSection(title: String, rows: [(String, String)]) -> some View {
+        VStack(alignment: .leading, spacing: 12) {
+            Text(title)
+                .appSectionTitleStyle(.section)
+
+            VStack(spacing: 0) {
+                ForEach(rows, id: \.0) { title, value in
+                    detailRow(title: title, value: value)
+                }
+            }
+            .appDetailSectionCard()
+        }
+    }
+
+    @ViewBuilder
+    private func detailRow(title: String, value: String) -> some View {
+        HStack(alignment: .firstTextBaseline) {
+            Text(title)
+                .appTextStyle(.fieldLabel)
+                .frame(width: 150, alignment: .leading)
+
+            Text(value)
+                .textSelection(.enabled)
+                .frame(maxWidth: .infinity, alignment: .leading)
+        }
+        .padding(.vertical, 8)
+    }
+}

World Manager for Minecraft/UI/Detail/ItemDetailColumnViews.swift

@@ -7,6 +7,8 @@ import SwiftUI
 struct ItemDetailColumnView: View {
     let item: MinecraftContentItem?
     let source: MinecraftSource?
+    let sourceCandidate: SourceCandidate?
+    let connectedDevice: ConnectedDeviceSidebarEntry?
     let showsSourceDetails: Bool
     let behaviorPacks: [ContentPackReference]
     let resourcePacks: [ContentPackReference]
@@ -22,11 +24,13 @@ struct ItemDetailColumnView: View {
     let exportAction: () -> Void
     let revealAction: () -> Void
     let shareAction: (NSView?) -> Void
+    let addCandidateSourceAction: (SourceCandidate) -> Void
+    let revealCandidateAction: (SourceCandidate) -> Void
+    let addConnectedDeviceAction: (ConnectedDeviceSidebarEntry) -> Void
 
     var body: some View {
         Group {
-            if isEmpty {
-            } else if let item {
+            if let item {
                 ItemDetailView(
                     item: item,
                     source: source,
@@ -46,6 +50,24 @@ struct ItemDetailColumnView: View {
                 )
             } else if showsSourceDetails, let source {
                 SourceDetailView(source: source)
+            } else if let sourceCandidate {
+                SourceCandidateDetailView(
+                    candidate: sourceCandidate,
+                    addAction: {
+                        addCandidateSourceAction(sourceCandidate)
+                    },
+                    revealAction: {
+                        revealCandidateAction(sourceCandidate)
+                    }
+                )
+            } else if let connectedDevice {
+                ConnectedDeviceDetailView(
+                    entry: connectedDevice,
+                    addAction: connectedDevice.hasMinecraftContainer ? {
+                        addConnectedDeviceAction(connectedDevice)
+                    } : nil
+                )
+            } else if isEmpty {
             } else {
                 Text("Select a world or pack to see details")
                     .foregroundStyle(.secondary)

World Manager for Minecraft/UI/Detail/SourceCandidateDetailView.swift

@@ -0,0 +1,156 @@
+// SPDX-FileCopyrightText: 2026 John Burwell and contributors
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import SwiftUI
+
+struct SourceCandidateDetailView: View {
+    let candidate: SourceCandidate
+    let addAction: () -> Void
+    let revealAction: () -> Void
+
+    var body: some View {
+        ScrollView {
+            VStack(alignment: .leading, spacing: 24) {
+                VStack(alignment: .leading, spacing: 8) {
+                    Text(candidate.displayName)
+                        .font(.largeTitle.weight(.semibold))
+
+                    Text("Found source candidate")
+                        .foregroundStyle(.secondary)
+                }
+
+                HStack(spacing: 10) {
+                    Button("Add Source") {
+                        addAction()
+                    }
+                    .buttonStyle(.borderedProminent)
+
+                    Button("Reveal in Finder") {
+                        revealAction()
+                    }
+                    .buttonStyle(.bordered)
+                }
+
+                sourceSection(title: "Overview", rows: overviewRows)
+                sourceSection(title: "Detected Content", rows: contentRows)
+                sourceSection(title: "Location", rows: locationRows)
+                sourceSection(title: "Technical Details", rows: technicalRows)
+            }
+            .frame(maxWidth: 760, alignment: .leading)
+            .padding(28)
+        }
+    }
+
+    private var overviewRows: [(String, String)] {
+        [
+            ("Edition", editionLabel),
+            ("Provider", providerLabel),
+            ("Confidence", confidenceLabel),
+            ("Reason", candidate.reason)
+        ]
+    }
+
+    private var contentRows: [(String, String)] {
+        guard !candidate.detectedKinds.isEmpty else {
+            return [("Detected Kinds", "None")]
+        }
+
+        return [("Detected Kinds", orderedKindLabels.joined(separator: ", "))]
+    }
+
+    private var locationRows: [(String, String)] {
+        [
+            ("Filesystem Path", candidate.sourceRootURL.path)
+        ]
+    }
+
+    private var technicalRows: [(String, String)] {
+        [
+            ("Provider ID", candidate.providerID),
+            ("Candidate ID", candidate.id)
+        ]
+    }
+
+    private var editionLabel: String {
+        switch candidate.edition {
+        case .bedrock:
+            return "Bedrock"
+        case .java:
+            return "Java"
+        }
+    }
+
+    private var providerLabel: String {
+        switch candidate.providerID {
+        case JavaLocalFolderSourceAccess().accessorIdentifier:
+            return "Java Local Folder"
+        case LocalFolderSourceAccess().accessorIdentifier:
+            return "Bedrock Local Folder"
+        case AppleMobileDeviceSourceAccess().accessorIdentifier:
+            return "Bedrock iOS Device"
+        default:
+            return candidate.providerID
+        }
+    }
+
+    private var confidenceLabel: String {
+        switch candidate.confidence {
+        case .none:
+            return "None"
+        case .weak:
+            return "Weak"
+        case .medium:
+            return "Medium"
+        case .strong:
+            return "Strong"
+        case .exact:
+            return "Exact"
+        }
+    }
+
+    private var orderedKindLabels: [String] {
+        let orderedKinds: [(MinecraftContentKind, String)] = [
+            (.world, "Worlds"),
+            (.behaviorPack, "Behavior Packs"),
+            (.resourcePack, "Resource Packs"),
+            (.dataPack, "Data Packs"),
+            (.skinPack, "Skin Packs"),
+            (.worldTemplate, "World Templates"),
+            (.shaderPack, "Shader Packs"),
+            (.mod, "Mods")
+        ]
+
+        return orderedKinds.compactMap { kind, label in
+            candidate.detectedKinds.contains(kind) ? label : nil
+        }
+    }
+
+    @ViewBuilder
+    private func sourceSection(title: String, rows: [(String, String)]) -> some View {
+        VStack(alignment: .leading, spacing: 12) {
+            Text(title)
+                .appSectionTitleStyle(.section)
+
+            VStack(spacing: 0) {
+                ForEach(rows, id: \.0) { title, value in
+                    detailRow(title: title, value: value)
+                }
+            }
+            .appDetailSectionCard()
+        }
+    }
+
+    @ViewBuilder
+    private func detailRow(title: String, value: String) -> some View {
+        HStack(alignment: .firstTextBaseline) {
+            Text(title)
+                .appTextStyle(.fieldLabel)
+                .frame(width: 150, alignment: .leading)
+
+            Text(value)
+                .textSelection(.enabled)
+                .frame(maxWidth: .infinity, alignment: .leading)
+        }
+        .padding(.vertical, 8)
+    }
+}

World Manager for Minecraft/UI/Detail/SourceDetailView.swift

@@ -183,7 +183,7 @@ struct SourceDetailView: View {
         }
 
         switch source.origin {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             break
         case .connectedDevice(let device, let container):
             rows.append(("Connection", device.connection == .network ? "Network" : "USB"))
@@ -197,19 +197,31 @@ struct SourceDetailView: View {
     }
 
     private var contentRows: [(String, String)] {
-        [
-            ("Total Items", source.items.count.formatted(.number)),
-            ("Worlds", itemCount(for: .world).formatted(.number)),
-            ("Behavior Packs", itemCount(for: .behaviorPack).formatted(.number)),
-            ("Resource Packs", itemCount(for: .resourcePack).formatted(.number)),
-            ("Skin Packs", itemCount(for: .skinPack).formatted(.number)),
-            ("World Templates", itemCount(for: .worldTemplate).formatted(.number))
+        var rows = [("Total Items", source.items.count.formatted(.number))]
+        let orderedKinds: [(MinecraftContentKind, String)] = [
+            (.world, "Worlds"),
+            (.behaviorPack, "Behavior Packs"),
+            (.resourcePack, "Resource Packs"),
+            (.dataPack, "Data Packs"),
+            (.skinPack, "Skin Packs"),
+            (.worldTemplate, "World Templates"),
+            (.shaderPack, "Shader Packs"),
+            (.mod, "Mods")
         ]
+
+        for (kind, title) in orderedKinds {
+            let count = itemCount(for: kind)
+            if count > 0 || source.edition == .bedrock && bedrockAlwaysDisplayedContentKinds.contains(kind) {
+                rows.append((title, count.formatted(.number)))
+            }
+        }
+
+        return rows
     }
 
     private var locationRows: [(String, String)] {
         switch source.origin {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             return [("Filesystem Path", source.folderURL.path)]
         case .connectedDevice(_, let container):
             var rows: [(String, String)] = [
@@ -224,7 +236,7 @@ struct SourceDetailView: View {
 
     private var technicalRows: [(String, String)] {
         switch source.origin {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             return []
         case .connectedDevice(let device, let container):
             var rows: [(String, String)] = [
@@ -244,6 +256,8 @@ struct SourceDetailView: View {
         switch source.origin {
         case .localFolder:
             return "Local Folder"
+        case .javaLocalFolder:
+            return "Java Local Folder"
         case .connectedDevice:
             return "Connected Device"
         }
@@ -483,6 +497,14 @@ struct SourceDetailView: View {
         source.items.filter { $0.contentType == type }.count
     }
 
+    private func itemCount(for kind: MinecraftContentKind) -> Int {
+        source.items.filter { $0.contentKind == kind }.count
+    }
+
+    private var bedrockAlwaysDisplayedContentKinds: Set<MinecraftContentKind> {
+        [.world, .behaviorPack, .resourcePack, .skinPack, .worldTemplate]
+    }
+
     @ViewBuilder
     private func sourceSection(title: String, rows: [(String, String)]) -> some View {
         VStack(alignment: .leading, spacing: 12) {

World Manager for Minecraft/UI/Preview/PreviewFixtures.swift

@@ -144,6 +144,9 @@ enum PreviewFixtures {
         source.displayItemCountsByType = source.displayItems.reduce(into: [MinecraftContentType: Int]()) { counts, item in
             counts[item.contentType, default: 0] += 1
         }
+        source.displayItemCountsByKind = source.displayItems.reduce(into: [MinecraftContentKind: Int]()) { counts, item in
+            counts[item.contentKind, default: 0] += 1
+        }
         source.rawItems = source.displayItems
         source.logicalPacks = [
             LogicalPack(
@@ -229,6 +232,9 @@ enum PreviewFixtures {
         source.displayItemCountsByType = source.displayItems.reduce(into: [MinecraftContentType: Int]()) { counts, item in
             counts[item.contentType, default: 0] += 1
         }
+        source.displayItemCountsByKind = source.displayItems.reduce(into: [MinecraftContentKind: Int]()) { counts, item in
+            counts[item.contentKind, default: 0] += 1
+        }
         source.rawItems = source.displayItems
         source.indexedItemCount = source.displayItems.count
         source.indexedDetailCount = source.displayItems.count
@@ -256,8 +262,12 @@ struct SidebarColumnPreviewContainer: View {
             SourcesSidebarView(
                 sources: PreviewFixtures.allSources,
                 connectedDevices: [],
+                sourceCandidates: [],
+                isDiscoveringSourceCandidates: false,
                 selection: $selection,
                 addSourceAction: {},
+                discoverSourcesAction: {},
+                addCandidateSourceAction: { _ in },
                 addDeviceSourceAction: {},
                 addConnectedDeviceAction: { _ in },
                 rescanSourceAction: { _ in },
@@ -345,6 +355,8 @@ struct ItemDetailColumnPreviewContainer: View {
             ItemDetailColumnView(
                 item: PreviewFixtures.featuredWorld,
                 source: PreviewFixtures.primarySource,
+                sourceCandidate: nil,
+                connectedDevice: nil,
                 showsSourceDetails: false,
                 behaviorPacks: PreviewFixtures.primarySource.resolvedPackReferences(for: PreviewFixtures.featuredWorld.id, type: .behaviorPack),
                 resourcePacks: PreviewFixtures.primarySource.resolvedPackReferences(for: PreviewFixtures.featuredWorld.id, type: .resourcePack),
@@ -359,7 +371,10 @@ struct ItemDetailColumnPreviewContainer: View {
                 exportTitle: PreviewFixtures.featuredWorld.contentType.exportTitle,
                 exportAction: {},
                 revealAction: {},
-                shareAction: { _ in }
+                shareAction: { _ in },
+                addCandidateSourceAction: { _ in },
+                revealCandidateAction: { _ in },
+                addConnectedDeviceAction: { _ in }
             )
         }
     }

World Manager for Minecraft/UI/Root/ContentView.swift

@@ -43,8 +43,10 @@ struct ContentView: View {
     }
 
     var body: some View {
-        let isEmptyLibrary = library.visibleSources.isEmpty && library.connectedDevices.isEmpty
+        let isEmptyLibrary = library.visibleSources.isEmpty && library.sidebarConnectedDevices.isEmpty && library.sourceCandidates.isEmpty
         let resolvedCurrentSource = currentSource
+        let resolvedCurrentSourceCandidate = currentSourceCandidate
+        let resolvedCurrentConnectedDevice = currentConnectedDevice
         let currentProjectionRequest = ItemCollectionProjectionRequest(
             selection: selectedSidebarSelection,
             searchText: searchText,
@@ -74,9 +76,15 @@ struct ContentView: View {
         NavigationSplitView(columnVisibility: $columnVisibility) {
             SourcesSidebarView(
                 sources: library.sidebarSources,
-                connectedDevices: library.connectedDevices,
+                connectedDevices: library.sidebarConnectedDevices,
+                sourceCandidates: library.sourceCandidates,
+                isDiscoveringSourceCandidates: library.isDiscoveringSourceCandidates,
                 selection: sidebarSelectionBinding,
                 addSourceAction: pickFolder,
+                discoverSourcesAction: {
+                    library.perform(.discoverSourceCandidates)
+                },
+                addCandidateSourceAction: addCandidateSource(_:),
                 addDeviceSourceAction: { isShowingDeviceSourceSheet = true },
                 addConnectedDeviceAction: addConnectedDeviceSource(from:),
                 rescanSourceAction: { source in
@@ -116,6 +124,8 @@ struct ContentView: View {
             ItemDetailColumnView(
                 item: resolvedCurrentSelectedItem,
                 source: resolvedCurrentSource,
+                sourceCandidate: resolvedCurrentSourceCandidate,
+                connectedDevice: resolvedCurrentConnectedDevice,
                 showsSourceDetails: resolvedCurrentSelectedItem == nil && isSourceOverviewSelection,
                 behaviorPacks: resolvedCurrentSelectedItem.map { logicalPackReferences(for: $0, type: .behaviorPack) } ?? [],
                 resourcePacks: resolvedCurrentSelectedItem.map { logicalPackReferences(for: $0, type: .resourcePack) } ?? [],
@@ -148,7 +158,10 @@ struct ContentView: View {
                     }
 
                     shareItem(item, from: anchorView)
-                }
+                },
+                addCandidateSourceAction: addCandidateSource(_:),
+                revealCandidateAction: revealCandidateInFinder(_:),
+                addConnectedDeviceAction: addConnectedDeviceSource(from:)
             )
             .frame(minWidth: 450)
         }
@@ -183,7 +196,7 @@ struct ContentView: View {
         .onChange(of: library.sources.map(\.id)) { _, _ in
             syncSelection(with: library.visibleSources.map(\.id))
         }
-        .onChange(of: library.connectedDevices.map { "\($0.id)::\($0.matchedSourceID?.absoluteString ?? "nil")" }) { _, _ in
+        .onChange(of: library.sidebarConnectedDevices.map { "\($0.id)::\($0.matchedSourceID?.absoluteString ?? "nil")" }) { _, _ in
             syncSelection(with: library.visibleSources.map(\.id))
         }
         .task(id: currentProjectionRequest) {
@@ -249,6 +262,22 @@ struct ContentView: View {
         return library.source(withID: sourceID)
     }
 
+    private var currentSourceCandidate: SourceCandidate? {
+        guard case .sourceCandidate(let candidateID) = selectedSidebarSelection else {
+            return nil
+        }
+
+        return library.sourceCandidates.first { $0.id == candidateID }
+    }
+
+    private var currentConnectedDevice: ConnectedDeviceSidebarEntry? {
+        guard case .connectedDevice(let deviceID) = selectedSidebarSelection else {
+            return nil
+        }
+
+        return library.sidebarConnectedDevices.first { $0.id == deviceID }
+    }
+
     private func currentSelectedItem(in source: MinecraftSource?) -> MinecraftContentItem? {
         guard let selectedItemID else {
             return nil
@@ -331,16 +360,27 @@ struct ContentView: View {
     }
 
     private func sidebarFilters(for source: MinecraftSource) -> [SidebarFilter] {
-        return MinecraftContentType.allCases.compactMap { contentType in
-            guard let count = source.displayItemCountsByType[contentType], count > 0 else {
+        let orderedKinds: [MinecraftContentKind] = [
+            .world,
+            .behaviorPack,
+            .resourcePack,
+            .dataPack,
+            .skinPack,
+            .worldTemplate,
+            .shaderPack,
+            .mod
+        ]
+
+        return orderedKinds.compactMap { contentKind in
+            guard let count = source.displayItemCountsByKind[contentKind], count > 0 else {
                 return nil
             }
 
             return SidebarFilter(
-                title: sidebarTitle(for: contentType),
-                iconName: sidebarIcon(for: contentType),
+                title: sidebarTitle(for: contentKind),
+                iconName: sidebarIcon(for: contentKind),
                 count: count,
-                selection: .contentType(sourceID: source.id, contentType: contentType)
+                selection: .contentKind(sourceID: source.id, contentKind: contentKind)
             )
         }
     }
@@ -372,6 +412,27 @@ struct ContentView: View {
         }
     }
 
+    private func sidebarTitle(for contentKind: MinecraftContentKind) -> String {
+        switch contentKind {
+        case .world:
+            return "Worlds"
+        case .behaviorPack:
+            return "Behavior Packs"
+        case .resourcePack:
+            return "Resource Packs"
+        case .dataPack:
+            return "Data Packs"
+        case .skinPack:
+            return "Skin Packs"
+        case .worldTemplate:
+            return "World Templates"
+        case .shaderPack:
+            return "Shader Packs"
+        case .mod:
+            return "Mods"
+        }
+    }
+
     private func sidebarIcon(for contentType: MinecraftContentType) -> String {
         switch contentType {
         case .world:
@@ -387,6 +448,27 @@ struct ContentView: View {
         }
     }
 
+    private func sidebarIcon(for contentKind: MinecraftContentKind) -> String {
+        switch contentKind {
+        case .world:
+            return "globe.europe.africa"
+        case .behaviorPack:
+            return "shippingbox"
+        case .resourcePack:
+            return "paintpalette"
+        case .dataPack:
+            return "curlybraces.square"
+        case .skinPack:
+            return "person.crop.square"
+        case .worldTemplate:
+            return "map"
+        case .shaderPack:
+            return "camera.filters"
+        case .mod:
+            return "hammer"
+        }
+    }
+
     @ViewBuilder
     private func itemContextMenu(for item: MinecraftContentItem) -> some View {
         Button("Share...") {
@@ -521,10 +603,24 @@ struct ContentView: View {
         }
 
         for url in panel.urls {
-            let sourceID = library.addSource(at: url)
+            Task { @MainActor in
+                let sourceID = await library.addSource(at: url)
                 selectSourceIfNeeded(sourceID)
             }
         }
+    }
+
+    private func addCandidateSource(_ candidate: SourceCandidate) {
+        Task {
+            let sourceID = await library.addSource(candidate: candidate)
+            selectedSidebarSelection = .source(sourceID: sourceID)
+            selectedItemID = nil
+        }
+    }
+
+    private func revealCandidateInFinder(_ candidate: SourceCandidate) {
+        NSWorkspace.shared.activateFileViewerSelecting([candidate.sourceRootURL])
+    }
 
     private func handleDroppedProviders(_ providers: [NSItemProvider]) -> Bool {
         let fileURLType = UTType.fileURL.identifier
@@ -543,7 +639,7 @@ struct ContentView: View {
                 }
 
                 Task { @MainActor in
-                    let sourceID = library.addSource(at: url)
+                    let sourceID = await library.addSource(at: url)
                     selectSourceIfNeeded(sourceID)
                 }
             }
@@ -585,8 +681,22 @@ struct ContentView: View {
     }
 
     private func syncSelection(with sourceIDs: [URL]) {
-        if let selectedSidebarSelection, !sourceIDs.contains(selectedSidebarSelection.sourceID) {
+        if let selectedSidebarSelection {
+            switch selectedSidebarSelection {
+            case .sourceCandidate(let candidateID):
+                if !library.sourceCandidates.contains(where: { $0.id == candidateID }) {
                     self.selectedSidebarSelection = sourceIDs.first.map { .source(sourceID: $0) }
+                }
+            case .connectedDevice(let deviceID):
+                if !library.sidebarConnectedDevices.contains(where: { $0.id == deviceID }) {
+                    self.selectedSidebarSelection = sourceIDs.first.map { .source(sourceID: $0) }
+                }
+            case .source, .allContent, .contentType, .contentKind:
+                if let selectedSourceID = selectedSidebarSelection.sourceID,
+                   !sourceIDs.contains(selectedSourceID) {
+                    self.selectedSidebarSelection = sourceIDs.first.map { .source(sourceID: $0) }
+                }
+            }
         } else if self.selectedSidebarSelection == nil, let firstSourceID = sourceIDs.first {
             self.selectedSidebarSelection = .source(sourceID: firstSourceID)
         }
@@ -767,7 +877,7 @@ struct ContentView: View {
     }
 
     private func archiveType(for item: MinecraftContentItem) -> UTType {
-        UTType(filenameExtension: item.contentType.archiveExtension) ?? .data
+        itemActionService.archiveContentType(for: item)
     }
 
     private func dragProvider(for item: MinecraftContentItem) -> NSItemProvider {

World Manager for Minecraft/UI/Root/ItemCollectionProjection.swift

@@ -77,21 +77,31 @@ enum ItemCollectionProjector {
         }
 
         switch selection {
+        case .sourceCandidate:
+            return "Source Candidate"
+        case .connectedDevice:
+            return "Connected Device"
         case .source, .allContent:
             return "All Items"
         case .contentType(_, let contentType):
             return sidebarTitle(for: contentType)
+        case .contentKind(_, let contentKind):
+            return sidebarTitle(for: contentKind)
         }
     }
 
     nonisolated static func searchPrompt(for selection: SidebarSelection?, source: MinecraftSource?) -> String {
         switch selection {
+        case .some(.sourceCandidate), .some(.connectedDevice):
+            return "Search Library"
         case .some(.source):
             return "Search \(source?.displayName ?? "Library")"
         case .some(.allContent):
             return "Search All Items"
         case .some(.contentType(_, let contentType)):
             return "Search \(sidebarTitle(for: contentType))"
+        case .some(.contentKind(_, let contentKind)):
+            return "Search \(sidebarTitle(for: contentKind))"
         case .none:
             return "Search Library"
         }
@@ -99,12 +109,18 @@ enum ItemCollectionProjector {
 
     nonisolated private static func searchScopeTitle(for selection: SidebarSelection?) -> String {
         switch selection {
+        case .some(.sourceCandidate):
+            return "Source Candidate"
+        case .some(.connectedDevice):
+            return "Connected Device"
         case .some(.source):
             return "Library"
         case .some(.allContent):
             return "All"
         case .some(.contentType(_, let contentType)):
             return sidebarTitle(for: contentType)
+        case .some(.contentKind(_, let contentKind)):
+            return sidebarTitle(for: contentKind)
         case .none:
             return "Library"
         }
@@ -116,6 +132,8 @@ enum ItemCollectionProjector {
         }
 
         switch selection {
+        case .sourceCandidate, .connectedDevice:
+            return "items"
         case .source, .allContent:
             return scopedItemCount == 1 ? "item" : "items"
         case .contentType(_, let contentType):
@@ -125,6 +143,17 @@ enum ItemCollectionProjector {
             case .behaviorPack, .resourcePack, .skinPack, .worldTemplate:
                 return scopedItemCount == 1 ? "pack" : "packs"
             }
+        case .contentKind(_, let contentKind):
+            switch contentKind {
+            case .world:
+                return scopedItemCount == 1 ? "world" : "worlds"
+            case .mod:
+                return scopedItemCount == 1 ? "mod" : "mods"
+            case .shaderPack:
+                return scopedItemCount == 1 ? "shader pack" : "shader packs"
+            case .behaviorPack, .resourcePack, .dataPack, .skinPack, .worldTemplate:
+                return scopedItemCount == 1 ? "pack" : "packs"
+            }
         }
     }
 
@@ -143,6 +172,27 @@ enum ItemCollectionProjector {
         }
     }
 
+    nonisolated private static func sidebarTitle(for contentKind: MinecraftContentKind) -> String {
+        switch contentKind {
+        case .world:
+            return "Worlds"
+        case .behaviorPack:
+            return "Behavior Packs"
+        case .resourcePack:
+            return "Resource Packs"
+        case .dataPack:
+            return "Data Packs"
+        case .skinPack:
+            return "Skin Packs"
+        case .worldTemplate:
+            return "World Templates"
+        case .shaderPack:
+            return "Shader Packs"
+        case .mod:
+            return "Mods"
+        }
+    }
+
     nonisolated static func trimmedSearchText(for request: ItemCollectionProjectionRequest) -> String {
         request.searchText.trimmingCharacters(in: .whitespacesAndNewlines)
     }

World Manager for Minecraft/UI/Sidebar/SidebarColumnViews.swift

@@ -5,13 +5,18 @@ import SwiftUI
 
 enum SidebarSelection: Hashable, Sendable {
     case source(sourceID: URL)
+    case sourceCandidate(candidateID: String)
+    case connectedDevice(deviceID: String)
     case allContent(sourceID: URL)
     case contentType(sourceID: URL, contentType: MinecraftContentType)
+    case contentKind(sourceID: URL, contentKind: MinecraftContentKind)
 
-    var sourceID: URL {
+    var sourceID: URL? {
         switch self {
-        case .source(let sourceID), .allContent(let sourceID), .contentType(let sourceID, _):
+        case .source(let sourceID), .allContent(let sourceID), .contentType(let sourceID, _), .contentKind(let sourceID, _):
             return sourceID
+        case .sourceCandidate, .connectedDevice:
+            return nil
         }
     }
 }
@@ -24,11 +29,30 @@ struct SidebarFilter: Identifiable, Hashable {
     let selection: SidebarSelection
 }
 
+private struct SidebarNode: Identifiable, Hashable {
+    let id: SidebarSelection
+    let row: SidebarNodeRow
+    let children: [SidebarNode]?
+
+    var selection: SidebarSelection { id }
+}
+
+private enum SidebarNodeRow: Hashable {
+    case source(MinecraftSource)
+    case filter(SidebarFilter)
+    case connectedDevice(ConnectedDeviceSidebarEntry)
+    case sourceCandidate(SourceCandidate)
+}
+
 struct SourcesSidebarView: View {
     let sources: [MinecraftSource]
     let connectedDevices: [ConnectedDeviceSidebarEntry]
+    let sourceCandidates: [SourceCandidate]
+    let isDiscoveringSourceCandidates: Bool
     @Binding var selection: SidebarSelection?
     let addSourceAction: () -> Void
+    let discoverSourcesAction: () -> Void
+    let addCandidateSourceAction: (SourceCandidate) -> Void
     let addDeviceSourceAction: () -> Void
     let addConnectedDeviceAction: (ConnectedDeviceSidebarEntry) -> Void
     let rescanSourceAction: (MinecraftSource) -> Void
@@ -37,28 +61,45 @@ struct SourcesSidebarView: View {
 
     var body: some View {
         List(selection: $selection) {
-            if !sources.isEmpty {
+            if !libraryNodes.isEmpty {
                 Section {
-                    ForEach(sources) { source in
-                        sourceSectionRows(for: source)
-                    }
+                    OutlineGroup(libraryNodes, children: \.children, content: sidebarNodeRow)
                 } header: {
                     SidebarSourcesSectionHeaderView(title: "Libraries")
                 }
             }
 
-            if !connectedDevices.isEmpty {
+            if !deviceNodes.isEmpty {
                 Section {
-                    ForEach(connectedDevices) { entry in
-                        connectedDeviceSectionRows(for: entry)
-                    }
+                    OutlineGroup(deviceNodes, children: \.children, content: sidebarNodeRow)
                 } header: {
                     SidebarSourcesSectionHeaderView(title: "Available Devices")
                 }
             }
+
+            if !candidateNodes.isEmpty {
+                Section {
+                    OutlineGroup(candidateNodes, children: \.children, content: sidebarNodeRow)
+                } header: {
+                    SidebarSourcesSectionHeaderView(title: "Found Sources")
+                }
+            }
         }
         .listStyle(.sidebar)
         .toolbar {
+            ToolbarItem {
+                Button(action: discoverSourcesAction) {
+                    if isDiscoveringSourceCandidates {
+                        ProgressView()
+                            .appActivityIndicatorStyle(.small)
+                    } else {
+                        Image(systemName: "magnifyingglass")
+                    }
+                }
+                .disabled(isDiscoveringSourceCandidates)
+                .help("Find Minecraft Sources")
+            }
+
             ToolbarItem {
                 Button(action: addSourceAction) {
                     Image(systemName: "folder.badge.plus")
@@ -75,19 +116,52 @@ struct SourcesSidebarView: View {
         }
     }
 
-    @ViewBuilder
-    private func sourceSectionRows(for source: MinecraftSource) -> some View {
-        let sourceFilters = filters(source)
-
-        SourceHeaderRow(
-            source: source,
-            onSelect: {
-                selection = .source(sourceID: source.id)
-            }
+    private var libraryNodes: [SidebarNode] {
+        sources.map { source in
+            let childNodes = filters(source).map { filter in
+                SidebarNode(
+                    id: filter.selection,
+                    row: .filter(filter),
+                    children: nil
                 )
-            .tag(SidebarSelection.source(sourceID: source.id) as SidebarSelection?)
+            }
+
+            return SidebarNode(
+                id: .source(sourceID: source.id),
+                row: .source(source),
+                children: childNodes.isEmpty ? nil : childNodes
+            )
+        }
+    }
+
+    private var deviceNodes: [SidebarNode] {
+        connectedDevices.map { entry in
+            SidebarNode(
+                id: .connectedDevice(deviceID: entry.id),
+                row: .connectedDevice(entry),
+                children: nil
+            )
+        }
+    }
+
+    private var candidateNodes: [SidebarNode] {
+        sourceCandidates.map { candidate in
+            SidebarNode(
+                id: .sourceCandidate(candidateID: candidate.id),
+                row: .sourceCandidate(candidate),
+                children: nil
+            )
+        }
+    }
+
+    @ViewBuilder
+    private func sidebarNodeRow(_ node: SidebarNode) -> some View {
+        switch node.row {
+        case .source(let source):
+            SourceHeaderRow(source: source)
+                .tag(node.selection as SidebarSelection?)
                 .listRowSeparator(.hidden)
-            .listRowInsets(EdgeInsets(top: 6, leading: 0, bottom: 0, trailing: 0))
+                .listRowInsets(EdgeInsets(top: 4, leading: 8, bottom: 4, trailing: 8))
                 .contextMenu {
                     Button("Rescan \"\(source.displayName)\"") {
                         rescanSourceAction(source)
@@ -99,29 +173,81 @@ struct SourcesSidebarView: View {
                         removeSourceAction(source)
                     }
                 }
-
-        ForEach(sourceFilters) { filter in
-            SidebarFilterRow(filter: filter, isIndented: true)
-                .tag(filter.selection as SidebarSelection?)
-        }
-    }
-
-    @ViewBuilder
-    private func connectedDeviceSectionRows(for entry: ConnectedDeviceSidebarEntry) -> some View {
+        case .filter(let filter):
+            SidebarFilterRow(filter: filter)
+                .tag(node.selection as SidebarSelection?)
+        case .connectedDevice(let entry):
             ConnectedDeviceRow(
                 entry: entry,
                 addAction: entry.hasMinecraftContainer ? {
                     addConnectedDeviceAction(entry)
                 } : nil
             )
+            .tag(node.selection as SidebarSelection?)
             .listRowSeparator(.hidden)
             .listRowInsets(EdgeInsets(top: 6, leading: 8, bottom: 0, trailing: 8))
+        case .sourceCandidate(let candidate):
+            SourceCandidateRow(
+                candidate: candidate,
+                addAction: {
+                    addCandidateSourceAction(candidate)
+                }
+            )
+            .tag(node.selection as SidebarSelection?)
+            .listRowSeparator(.hidden)
+            .listRowInsets(EdgeInsets(top: 4, leading: 8, bottom: 4, trailing: 8))
+        }
+    }
+}
+
+private struct SourceCandidateRow: View {
+    let candidate: SourceCandidate
+    let addAction: () -> Void
+
+    var body: some View {
+        HStack(spacing: 8) {
+            Image(systemName: symbolName)
+                .foregroundStyle(.secondary)
+                .frame(width: 16)
+
+            VStack(alignment: .leading, spacing: 2) {
+                Text(candidate.displayName)
+                    .lineLimit(1)
+
+                Text(subtitle)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+            }
+
+            Spacer(minLength: 8)
+
+            Button(action: addAction) {
+                Text("Add")
+            }
+            .appMiniProminentButton()
+            .help("Add Source")
+        }
+        .padding(.vertical, 4)
+    }
+
+    private var symbolName: String {
+        switch candidate.edition {
+        case .bedrock:
+            return "folder"
+        case .java:
+            return "curlybraces"
+        }
+    }
+
+    private var subtitle: String {
+        let editionName = candidate.edition == .java ? "Java" : "Bedrock"
+        return "\(editionName) - \(candidate.sourceRootURL.lastPathComponent)"
     }
 }
 
 private struct SidebarFilterRow: View {
     let filter: SidebarFilter
-    let isIndented: Bool
 
     var body: some View {
         HStack(spacing: 10) {
@@ -136,7 +262,6 @@ private struct SidebarFilterRow: View {
             Text(filter.count, format: .number)
                 .foregroundStyle(.secondary)
         }
-        .padding(.leading, isIndented ? 16 : 0)
     }
 }
 
@@ -150,7 +275,6 @@ private struct SidebarSourcesSectionHeaderView: View {
 
 private struct SourceHeaderRow: View {
     let source: MinecraftSource
-    let onSelect: () -> Void
 
     var body: some View {
         HStack(spacing: 8) {
@@ -177,10 +301,8 @@ private struct SourceHeaderRow: View {
             }
         }
         .frame(maxWidth: .infinity, alignment: .leading)
-        .padding(.leading, 5)
-        .padding(.vertical, 6)
-        .contentShape(Rectangle())
-        .onTapGesture(perform: onSelect)
+        .padding(.horizontal, 8)
+        .padding(.vertical, 5)
     }
 
     private var connection: DeviceConnection? {
@@ -197,7 +319,7 @@ private struct SourceHeaderRow: View {
 
     private var headerSymbolName: String {
         switch source.origin {
-        case .localFolder:
+        case .localFolder, .javaLocalFolder:
             return "folder"
         case .connectedDevice:
             return "iphone.gen3"

World Manager for MinecraftTests/World_Manager_for_MinecraftTests.swift

@@ -13,6 +13,9 @@ struct World_Manager_for_MinecraftTests {
     @Test func sourceOriginsExposeOutboundCapabilities() async throws {
         let localSource = MinecraftSource(folderURL: URL(fileURLWithPath: "/tmp/local"))
         #expect(localSource.capabilities == .localFolder)
+        #expect(localSource.edition == .bedrock)
+        #expect(localSource.providerID == LocalFolderSourceAccess().accessorIdentifier)
+        #expect(localSource.accessStatus.mode == .localFileSystem)
 
         let device = ConnectedDevice(
             udid: "device",
@@ -35,6 +38,540 @@ struct World_Manager_for_MinecraftTests {
         )
 
         #expect(deviceSource.capabilities == .connectedDevice)
+        #expect(deviceSource.edition == .bedrock)
+        #expect(deviceSource.providerID == AppleMobileDeviceSourceAccess().accessorIdentifier)
+        #expect(deviceSource.accessStatus.mode == .usbDevice)
+    }
+
+    @Test func contentItemsExposeNeutralProviderSurface() async throws {
+        let rootURL = URL(fileURLWithPath: "/tmp/source")
+        let item = MinecraftContentItem(
+            folderURL: rootURL.appendingPathComponent("minecraftWorlds/WorldA", isDirectory: true),
+            folderName: "WorldA",
+            contentType: .world,
+            collectionRootURL: rootURL.appendingPathComponent("minecraftWorlds", isDirectory: true),
+            displayName: "World A",
+            packUUID: "ABC-123",
+            packVersion: "1.0.0"
+        )
+
+        #expect(item.sourceEdition == .bedrock)
+        #expect(item.contentKind == .world)
+        #expect(item.platformType == .bedrock(.world))
+        #expect(item.capabilities.portablePackageExtension == "mcworld")
+        if case .bedrock(let metadata) = item.platformMetadata {
+            #expect(metadata.packUUID == "abc-123")
+            #expect(metadata.packVersion == "1.0.0")
+        } else {
+            Issue.record("Expected Bedrock metadata")
+        }
+    }
+
+    @Test func bedrockCompatibilityFieldsSynchronizePlatformMetadata() async throws {
+        let rootURL = URL(fileURLWithPath: "/tmp/source")
+        var item = MinecraftContentItem(
+            folderURL: rootURL.appendingPathComponent("behavior_packs/PackA", isDirectory: true),
+            folderName: "PackA",
+            contentType: .behaviorPack,
+            collectionRootURL: rootURL.appendingPathComponent("behavior_packs", isDirectory: true)
+        )
+
+        item.packUUID = "PACK-A"
+        item.packVersion = "2.0.0"
+
+        if case .bedrock(let metadata) = item.platformMetadata {
+            #expect(metadata.packUUID == "pack-a")
+            #expect(metadata.packVersion == "2.0.0")
+        } else {
+            Issue.record("Expected Bedrock metadata")
+        }
+    }
+
+    @Test func localFolderAccessStreamsProviderEvents() async throws {
+        let fileManager = FileManager.default
+        let rootURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let itemURL = rootURL.appendingPathComponent("minecraftWorlds/WorldA", isDirectory: true)
+        defer { try? fileManager.removeItem(at: rootURL) }
+
+        try fileManager.createDirectory(at: itemURL, withIntermediateDirectories: true)
+        try "World A".write(
+            to: itemURL.appendingPathComponent("levelname.txt"),
+            atomically: true,
+            encoding: .utf8
+        )
+
+        let source = MinecraftSource(folderURL: rootURL)
+        let access = LocalFolderSourceAccess()
+        var sawAccessStatus = false
+        var sawRunningStage = false
+        var sawFinishedStage = false
+        var discoveredItems: [MinecraftContentItem] = []
+
+        for try await event in access.scanEvents(for: source, mode: .fullScan) {
+            switch event {
+            case .accessStatusChanged(let status):
+                sawAccessStatus = true
+                #expect(status.availability == .available)
+                #expect(status.mode == .localFileSystem)
+            case .stageUpdated(let stage):
+                if stage.state == .running {
+                    sawRunningStage = true
+                }
+                if stage.state == .succeeded {
+                    sawFinishedStage = true
+                }
+            case .discovered(let item):
+                discoveredItems.append(item)
+            case .inspected, .warning:
+                break
+            }
+        }
+
+        #expect(sawAccessStatus)
+        #expect(sawRunningStage)
+        #expect(sawFinishedStage)
+        #expect(discoveredItems.map(\.displayName).contains("WorldA"))
+    }
+
+    @Test func javaLocalFolderSourceUsesJavaProviderDefaults() async throws {
+        let source = MinecraftSource(
+            folderURL: URL(fileURLWithPath: "/tmp/java"),
+            origin: .javaLocalFolder(bookmarkData: nil)
+        )
+
+        #expect(source.edition == .java)
+        #expect(source.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(source.accessDescriptor.accessorIdentifier == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(source.accessStatus.mode == .localFileSystem)
+    }
+
+    @Test func javaLocalFolderAccessDiscoversWorldsAndResourcePacks() async throws {
+        let fileManager = FileManager.default
+        let rootURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let instanceURL = rootURL.appendingPathComponent("Better MC [NEOFORGE] BMC5", isDirectory: true)
+        let worldURL = instanceURL.appendingPathComponent("saves/JavaWorld", isDirectory: true)
+        let packURL = instanceURL.appendingPathComponent("resourcepacks/JavaPack", isDirectory: true)
+        let zippedPackURL = instanceURL.appendingPathComponent("resourcepacks/JavaPack.zip")
+        let shaderPackURL = instanceURL.appendingPathComponent("shaderpacks/Shader.zip")
+        let modURL = instanceURL.appendingPathComponent("mods/ExampleMod.jar")
+        defer { try? fileManager.removeItem(at: rootURL) }
+
+        try fileManager.createDirectory(at: worldURL, withIntermediateDirectories: true)
+        try Data().write(to: worldURL.appendingPathComponent("level.dat"))
+        try "Displayed Java World".write(
+            to: worldURL.appendingPathComponent("levelname.txt"),
+            atomically: true,
+            encoding: .utf8
+        )
+        try fileManager.createDirectory(at: packURL, withIntermediateDirectories: true)
+        try "{}".write(
+            to: packURL.appendingPathComponent("pack.mcmeta"),
+            atomically: true,
+            encoding: .utf8
+        )
+        try fileManager.createDirectory(at: zippedPackURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("zip".utf8).write(to: zippedPackURL)
+        try fileManager.createDirectory(at: shaderPackURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("shader".utf8).write(to: shaderPackURL)
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
+
+        let access = SourceAccessCoordinator(
+            accessMethods: [
+                LocalFolderSourceAccess(),
+                JavaLocalFolderSourceAccess()
+            ]
+        )
+        let probe = await access.probeLocalFolder(rootURL)
+        #expect(probe?.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(probe?.sourceRootURL == instanceURL.standardizedFileURL)
+        #expect(probe?.detectedKinds.contains(.mod) == true)
+
+        var source = MinecraftSource(
+            folderURL: instanceURL,
+            origin: .localFolder(bookmarkData: nil),
+            accessDescriptor: SourceAccessDescriptor(
+                accessorIdentifier: JavaLocalFolderSourceAccess().accessorIdentifier,
+                kind: .localFolder,
+                refreshStrategy: .eagerFullScan
+            )
+        )
+        source.edition = .java
+        source.providerID = JavaLocalFolderSourceAccess().accessorIdentifier
+        var discoveredItems: [MinecraftContentItem] = []
+
+        for try await event in access.scanEvents(for: source, mode: .fullScan) {
+            if case .discovered(let item) = event {
+                discoveredItems.append(item)
+            }
+        }
+        var enrichedItems: [MinecraftContentItem] = []
+        for item in discoveredItems {
+            enrichedItems.append(await access.enrich(item, for: source))
+        }
+
+        #expect(discoveredItems.count == 5)
+        #expect(discoveredItems.allSatisfy { $0.sourceEdition == .java })
+        #expect(discoveredItems.contains { $0.platformType == .java(.world) && $0.capabilities.portablePackageExtension == "zip" })
+        #expect(discoveredItems.contains { $0.platformType == .java(.resourcePack) && $0.contentType == .resourcePack })
+        #expect(discoveredItems.contains { $0.platformType == .java(.shaderPack) && $0.contentKind == .shaderPack })
+        #expect(discoveredItems.contains { $0.platformType == .java(.mod) && $0.contentKind == .mod })
+        #expect(enrichedItems.contains { $0.displayName == "Displayed Java World" })
+
+        var indexedSource = source
+        indexedSource.rawItems = enrichedItems
+        let index = SourceContentIndexer.buildIndex(for: indexedSource)
+        #expect(index.displayItemCountsByKind[.world] == 1)
+        #expect(index.displayItemCountsByKind[.resourcePack] == 2)
+        #expect(index.displayItemCountsByKind[.shaderPack] == 1)
+        #expect(index.displayItemCountsByKind[.mod] == 1)
+
+        indexedSource.rawItems = enrichedItems
+        let snapshot = SourceScanPolicy.buildSnapshot(for: indexedSource, scanRootURL: instanceURL)
+        #expect(snapshot.collectionSnapshots.map(\.folderName).contains("saves"))
+        #expect(snapshot.collectionSnapshots.map(\.folderName).contains("resourcepacks"))
+        #expect(snapshot.collectionSnapshots.map(\.folderName).contains("shaderpacks"))
+        #expect(snapshot.collectionSnapshots.map(\.folderName).contains("mods"))
+    }
+
+    @Test func javaArchiveEnrichmentReadsModMetadataPackMetadataAndIcons() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let modSourceURL = workingURL.appendingPathComponent("ModSource", isDirectory: true)
+        let resourceSourceURL = workingURL.appendingPathComponent("ResourceSource", isDirectory: true)
+        let modArchiveURL = workingURL.appendingPathComponent("ExampleMod.jar")
+        let resourceArchiveURL = workingURL.appendingPathComponent("ExamplePack.zip")
+        defer { try? fileManager.removeItem(at: workingURL) }
+
+        try fileManager.createDirectory(at: modSourceURL.appendingPathComponent("META-INF", isDirectory: true), withIntermediateDirectories: true)
+        try """
+        modLoader = "javafml"
+        loaderVersion = "[1,)"
+
+        [[mods]]
+        modId = "examplemod"
+        displayName = "Example Java Mod"
+        logoFile = "icon.png"
+        description = "A test mod."
+        """.write(
+            to: modSourceURL.appendingPathComponent("META-INF/neoforge.mods.toml"),
+            atomically: true,
+            encoding: .utf8
+        )
+        try """
+        {
+          "pack": {
+            "description": "Example Mod Resources",
+            "pack_format": 31
+          }
+        }
+        """.write(to: modSourceURL.appendingPathComponent("pack.mcmeta"), atomically: true, encoding: .utf8)
+        try Data([0x89, 0x50, 0x4E, 0x47]).write(to: modSourceURL.appendingPathComponent("icon.png"))
+        try makeArchive(from: modSourceURL, to: modArchiveURL)
+
+        try fileManager.createDirectory(at: resourceSourceURL, withIntermediateDirectories: true)
+        try """
+        {
+          "pack": {
+            "description": "Example Resource Pack",
+            "pack_format": 34
+          }
+        }
+        """.write(to: resourceSourceURL.appendingPathComponent("pack.mcmeta"), atomically: true, encoding: .utf8)
+        try Data([0x89, 0x50, 0x4E, 0x47]).write(to: resourceSourceURL.appendingPathComponent("pack.png"))
+        try makeArchive(from: resourceSourceURL, to: resourceArchiveURL)
+
+        let modItem = MinecraftContentItem(
+            folderURL: modArchiveURL,
+            folderName: modArchiveURL.lastPathComponent,
+            contentType: .resourcePack,
+            sourceEdition: .java,
+            contentKind: .mod,
+            platformType: .java(.mod),
+            collectionRootURL: workingURL,
+            capabilities: .java(contentType: .mod),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+        let resourceItem = MinecraftContentItem(
+            folderURL: resourceArchiveURL,
+            folderName: resourceArchiveURL.lastPathComponent,
+            contentType: .resourcePack,
+            sourceEdition: .java,
+            contentKind: .resourcePack,
+            platformType: .java(.resourcePack),
+            collectionRootURL: workingURL,
+            capabilities: .java(contentType: .resourcePack),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+
+        let enrichedMod = await JavaContentScanner.enrich(item: modItem)
+        let enrichedResource = await JavaContentScanner.enrich(item: resourceItem)
+
+        #expect(enrichedMod.displayName == "Example Java Mod")
+        #expect(enrichedMod.iconURL != nil)
+        #expect(enrichedMod.hasKnownIcon)
+        if case .java(let metadata) = enrichedMod.platformMetadata {
+            #expect(metadata.pack?.description == "Example Mod Resources")
+            #expect(metadata.pack?.packFormat == 31)
+        } else {
+            Issue.record("Expected Java metadata")
+        }
+
+        #expect(enrichedResource.iconURL != nil)
+        if case .java(let metadata) = enrichedResource.platformMetadata {
+            #expect(metadata.pack?.description == "Example Resource Pack")
+            #expect(metadata.pack?.packFormat == 34)
+        } else {
+            Issue.record("Expected Java metadata")
+        }
+    }
+
+    @Test func javaProviderDiscoversSourceCandidatesFromBoundedRoots() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let instanceRootURL = workingURL
+            .appendingPathComponent("PrismLauncher/instances/Example Instance/.minecraft", isDirectory: true)
+        let modURL = instanceRootURL.appendingPathComponent("mods/ExampleMod.jar")
+        defer { try? fileManager.removeItem(at: workingURL) }
+
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
+        try fileManager.createDirectory(
+            at: instanceRootURL.appendingPathComponent("resourcepacks", isDirectory: true),
+            withIntermediateDirectories: true
+        )
+
+        let access = JavaLocalFolderSourceAccess(candidateDiscoveryRoots: [workingURL])
+        var candidates: [SourceCandidate] = []
+
+        for try await event in access.discoverSourceCandidates() {
+            if case .candidate(let candidate) = event {
+                candidates.append(candidate)
+            }
+        }
+
+        #expect(candidates.contains { candidate in
+            candidate.providerID == JavaLocalFolderSourceAccess().accessorIdentifier
+                && candidate.edition == .java
+                && candidate.sourceRootURL == instanceRootURL.standardizedFileURL
+                && candidate.detectedKinds.contains(.mod)
+                && candidate.detectedKinds.contains(.resourcePack)
+        })
+    }
+
+    @Test func javaProviderCollapsesNestedSourceCandidatesToSearchRoot() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let firstInstanceURL = workingURL.appendingPathComponent("a/b/c", isDirectory: true)
+        let secondInstanceURL = workingURL.appendingPathComponent("a/e/f", isDirectory: true)
+        defer { try? fileManager.removeItem(at: workingURL) }
+
+        for instanceURL in [firstInstanceURL, secondInstanceURL] {
+            try fileManager.createDirectory(
+                at: instanceURL.appendingPathComponent("mods", isDirectory: true),
+                withIntermediateDirectories: true
+            )
+            try Data("jar".utf8).write(to: instanceURL.appendingPathComponent("mods/ExampleMod.jar"))
+        }
+
+        let candidates = JavaContentScanner.discoverSourceCandidates(
+            providerID: JavaLocalFolderSourceAccess().accessorIdentifier,
+            searchRoots: [workingURL]
+        )
+
+        #expect(candidates.count == 1)
+        #expect(candidates.first?.sourceRootURL == workingURL.standardizedFileURL)
+        #expect(candidates.first?.displayName == workingURL.lastPathComponent)
+        #expect(candidates.first?.detectedKinds.contains(.mod) == true)
+    }
+
+    @Test func javaProviderDeduplicatesCaseVariantSourceRoots() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let upperRootURL = workingURL.appendingPathComponent("CurseForge/Minecraft", isDirectory: true)
+        let lowerRootURL = workingURL.appendingPathComponent("curseforge/minecraft", isDirectory: true)
+        let firstInstanceURL = upperRootURL.appendingPathComponent("Instances/ExampleOne", isDirectory: true)
+        let secondInstanceURL = upperRootURL.appendingPathComponent("Instances/ExampleTwo", isDirectory: true)
+        defer { try? fileManager.removeItem(at: workingURL) }
+
+        for instanceURL in [firstInstanceURL, secondInstanceURL] {
+            try fileManager.createDirectory(
+                at: instanceURL.appendingPathComponent("mods", isDirectory: true),
+                withIntermediateDirectories: true
+            )
+            try Data("jar".utf8).write(to: instanceURL.appendingPathComponent("mods/ExampleMod.jar"))
+        }
+
+        guard fileManager.fileExists(atPath: lowerRootURL.path) else {
+            return
+        }
+
+        let candidates = JavaContentScanner.discoverSourceCandidates(
+            providerID: JavaLocalFolderSourceAccess().accessorIdentifier,
+            searchRoots: [upperRootURL, lowerRootURL]
+        )
+
+        #expect(candidates.count == 1)
+        #expect(sourceIdentityKey(for: candidates[0].sourceRootURL) == sourceIdentityKey(for: upperRootURL))
+    }
+
+    @Test func javaAggregateRootDiscoversNestedInstanceItems() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let firstInstanceURL = workingURL.appendingPathComponent("a/b/c", isDirectory: true)
+        let secondInstanceURL = workingURL.appendingPathComponent("a/e/f", isDirectory: true)
+        defer { try? fileManager.removeItem(at: workingURL) }
+
+        try fileManager.createDirectory(
+            at: firstInstanceURL.appendingPathComponent("mods", isDirectory: true),
+            withIntermediateDirectories: true
+        )
+        try Data("jar".utf8).write(to: firstInstanceURL.appendingPathComponent("mods/ExampleMod.jar"))
+
+        try fileManager.createDirectory(
+            at: secondInstanceURL.appendingPathComponent("resourcepacks", isDirectory: true),
+            withIntermediateDirectories: true
+        )
+        try Data("zip".utf8).write(to: secondInstanceURL.appendingPathComponent("resourcepacks/ExamplePack.zip"))
+
+        let items = try JavaContentScanner.discoverItems(in: workingURL)
+        let snapshots = JavaContentScanner.collectionSnapshots(in: workingURL)
+
+        #expect(items.contains { $0.contentKind == .mod && $0.folderName == "ExampleMod.jar" })
+        #expect(items.contains { $0.contentKind == .resourcePack && $0.folderName == "ExamplePack.zip" })
+        #expect(snapshots.map(\.folderName).contains("a/b/c/mods"))
+        #expect(snapshots.map(\.folderName).contains("a/e/f/resourcepacks"))
+    }
+
+    @Test func sourceRestorationComparesDuplicateCollectionNamesWithoutCrashing() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        defer { try? fileManager.removeItem(at: workingURL) }
+        try fileManager.createDirectory(at: workingURL, withIntermediateDirectories: true)
+
+        let collectionSnapshots = [
+            CollectionSnapshot(
+                folderName: "mods",
+                modifiedDate: Date(timeIntervalSince1970: 100),
+                childDirectoryCount: 1,
+                fingerprint: "a/b/c/mods::1::100"
+            ),
+            CollectionSnapshot(
+                folderName: "mods",
+                modifiedDate: Date(timeIntervalSince1970: 200),
+                childDirectoryCount: 2,
+                fingerprint: "x/y/z/mods::2::200"
+            )
+        ]
+        var source = MinecraftSource(
+            folderURL: workingURL,
+            origin: .javaLocalFolder(bookmarkData: nil),
+            accessDescriptor: SourceAccessDescriptor(
+                accessorIdentifier: JavaLocalFolderSourceAccess().accessorIdentifier,
+                kind: .localFolder,
+                refreshStrategy: .eagerFullScan
+            ),
+            availability: .available
+        )
+        source.edition = .java
+        source.snapshot = SourceSnapshot(
+            sourceID: workingURL,
+            rootModifiedDate: nil,
+            collectionSnapshots: collectionSnapshots,
+            itemSnapshots: []
+        )
+
+        #expect(SourceRestoration.needsReconcile(source) { _, _ in collectionSnapshots } == false)
+        #expect(
+            SourceRestoration.needsReconcile(source) { _, _ in
+                [
+                    collectionSnapshots[0],
+                    CollectionSnapshot(
+                        folderName: "mods",
+                        modifiedDate: Date(timeIntervalSince1970: 300),
+                        childDirectoryCount: 3,
+                        fingerprint: "x/y/z/mods::3::300"
+                    )
+                ]
+            } == true
+        )
+    }
+
+    @Test func sourceLibraryAddSourceCandidatePreservesJavaAggregateProvider() async throws {
+        let fileManager = FileManager.default
+        let workingURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let instanceURL = workingURL.appendingPathComponent("a/b/c", isDirectory: true)
+        let modURL = instanceURL.appendingPathComponent("mods/ExampleMod.jar")
+        defer { try? fileManager.removeItem(at: workingURL) }
+
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
+
+        let candidate = SourceCandidate(
+            providerID: JavaLocalFolderSourceAccess().accessorIdentifier,
+            edition: .java,
+            sourceRootURL: workingURL,
+            displayName: workingURL.lastPathComponent,
+            confidence: .strong,
+            reason: "Found multiple Java sources",
+            detectedKinds: [.mod]
+        )
+        let access = SourceAccessCoordinator(
+            accessMethods: [
+                LocalFolderSourceAccess(),
+                JavaLocalFolderSourceAccess()
+            ]
+        )
+        let library = SourceLibrary(sourceAccessMethod: access)
+
+        let sourceID = await library.addSource(candidate: candidate)
+        guard let source = library.source(withID: sourceID) else {
+            Issue.record("Expected added source")
+            return
+        }
+
+        #expect(source.folderURL == workingURL.standardizedFileURL)
+        #expect(source.edition == .java)
+        #expect(source.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(source.accessDescriptor.accessorIdentifier == JavaLocalFolderSourceAccess().accessorIdentifier)
+
+        let items = try JavaContentScanner.discoverItems(in: source.folderURL)
+        #expect(items.contains { $0.contentKind == .mod && $0.folderName == "ExampleMod.jar" })
+    }
+
+    @Test func sourceLibraryAddSourceResolvesJavaWrapperFolder() async throws {
+        let fileManager = FileManager.default
+        let rootURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let instanceURL = rootURL.appendingPathComponent("Better MC [NEOFORGE] BMC5", isDirectory: true)
+        let modURL = instanceURL.appendingPathComponent("mods/ExampleMod.jar")
+        defer { try? fileManager.removeItem(at: rootURL) }
+
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
+        try fileManager.createDirectory(
+            at: instanceURL.appendingPathComponent("resourcepacks", isDirectory: true),
+            withIntermediateDirectories: true
+        )
+
+        let access = SourceAccessCoordinator(
+            accessMethods: [
+                LocalFolderSourceAccess(),
+                JavaLocalFolderSourceAccess()
+            ]
+        )
+        let library = SourceLibrary(sourceAccessMethod: access)
+
+        let sourceID = await library.addSource(at: rootURL)
+        guard let source = library.source(withID: sourceID) else {
+            Issue.record("Expected added source")
+            return
+        }
+
+        #expect(source.folderURL == instanceURL.standardizedFileURL)
+        #expect(source.origin.kind == .localFolder)
+        #expect(source.edition == .java)
+        #expect(source.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(source.accessDescriptor.accessorIdentifier == JavaLocalFolderSourceAccess().accessorIdentifier)
     }
 
     @Test func libraryExternalRepresentationUsesPortablePackageByDefault() async throws {
@@ -951,6 +1488,106 @@ struct World_Manager_for_MinecraftTests {
         #expect(restored[0].lastScanDate == legacyRecord.lastScanDate)
     }
 
+    @Test func sourceRestorationPreservesJavaProviderResolvedLocalFolder() async throws {
+        let sourceURL = URL(fileURLWithPath: "/tmp/JavaInstance", isDirectory: true)
+        let accessDescriptor = SourceAccessDescriptor(
+            accessorIdentifier: JavaLocalFolderSourceAccess().accessorIdentifier,
+            kind: .localFolder,
+            refreshStrategy: .eagerFullScan
+        )
+        let record = PersistedSourceRecord(
+            sourceID: sourceURL,
+            folderURL: sourceURL,
+            origin: .localFolder(bookmarkData: nil),
+            accessDescriptor: accessDescriptor,
+            availability: .available,
+            bookmarkData: nil,
+            displayName: "Java Instance",
+            rawItems: [],
+            snapshot: nil,
+            lastScanDate: nil,
+            needsRepair: false
+        )
+
+        let source = SourceRestoration.restoredSource(from: record) { _, _ in "" }
+
+        #expect(source.origin.kind == .localFolder)
+        #expect(source.edition == .java)
+        #expect(source.providerID == JavaLocalFolderSourceAccess().accessorIdentifier)
+        #expect(source.accessDescriptor == accessDescriptor)
+    }
+
+    @Test func javaRestoredSnapshotDoesNotRequestRefreshWhenUnchanged() async throws {
+        let fileManager = FileManager.default
+        let sourceURL = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let modURL = sourceURL.appendingPathComponent("mods/ExampleMod.jar")
+        defer { try? fileManager.removeItem(at: sourceURL) }
+
+        try fileManager.createDirectory(at: modURL.deletingLastPathComponent(), withIntermediateDirectories: true)
+        try Data("jar".utf8).write(to: modURL)
+
+        let item = MinecraftContentItem(
+            folderURL: modURL,
+            folderName: modURL.lastPathComponent,
+            contentType: .resourcePack,
+            sourceEdition: .java,
+            contentKind: .mod,
+            platformType: .java(.mod),
+            collectionRootURL: modURL.deletingLastPathComponent(),
+            displayName: "ExampleMod",
+            capabilities: .java(contentType: .mod),
+            platformMetadata: .java(JavaContentMetadata())
+        )
+        var source = MinecraftSource(
+            folderURL: sourceURL,
+            origin: .localFolder(bookmarkData: nil),
+            accessDescriptor: SourceAccessDescriptor(
+                accessorIdentifier: JavaLocalFolderSourceAccess().accessorIdentifier,
+                kind: .localFolder,
+                refreshStrategy: .eagerFullScan
+            ),
+            availability: .available
+        )
+        source.providerID = JavaLocalFolderSourceAccess().accessorIdentifier
+        source.edition = .java
+        SourceRestoration.applyRestoredItemState(
+            [item],
+            lastScanDate: Date(timeIntervalSince1970: 1_000),
+            snapshot: nil,
+            to: &source
+        )
+        source.snapshot = SourceScanPolicy.buildSnapshot(for: source, scanRootURL: sourceURL)
+
+        let record = PersistedSourceRecord(
+            sourceID: source.id,
+            folderURL: source.folderURL,
+            origin: source.origin,
+            accessDescriptor: source.accessDescriptor,
+            availability: source.availability,
+            bookmarkData: nil,
+            displayName: source.displayName,
+            rawItems: source.rawItems,
+            snapshot: source.snapshot,
+            lastScanDate: source.lastScanDate,
+            needsRepair: false
+        )
+
+        let refreshReason = SourceRestoration.startupRefreshReason(
+            for: source,
+            persistedRecord: record
+        ) { url, edition in
+            switch edition {
+            case .bedrock:
+                return WorldScanner.collectionSnapshots(in: url)
+            case .java:
+                return JavaContentScanner.collectionSnapshots(in: url)
+            }
+        }
+
+        #expect(refreshReason == nil)
+        #expect(source.snapshot?.collectionSnapshots.first?.childDirectoryCount == 1)
+    }
+
     @Test func connectedDeviceSourceFactoryCreatesStableSyntheticIdentifier() async throws {
         let device = ConnectedDevice(
             udid: "00008110-001234560E90001E",

docs/provider-architecture-design.md

@@ -0,0 +1,248 @@
+# Provider Architecture Design
+
+World Manager should treat Minecraft libraries as sources of content units that
+can be discovered, inspected, cached, displayed, materialized, exported, and
+eventually copied between sources. Bedrock local folders, Bedrock iOS devices,
+Java local folders, and possible future platforms should be cohesive provider
+modules behind one engine contract.
+
+## Goals
+
+- Keep provider-specific knowledge inside provider modules.
+- Give the UI a uniform model for equivalent concepts: name, edition, kind,
+  source, icon, dates, size, availability, progress, and actions.
+- Preserve variable metadata for platform details that do not translate across
+  editions.
+- Allow scan workflows to stream events instead of forcing every provider into
+  the same fixed stages.
+- Keep connected-device and remote-like sources free to throttle work more
+  aggressively than local filesystem sources.
+
+## Shape
+
+```text
+Platforms/Bedrock
+  BedrockLocalFolderProvider
+  BedrockIOSDeviceProvider
+  BedrockContentScanner
+  BedrockMetadataReader
+  BedrockExporter
+  BedrockMaterializer
+
+Platforms/Java
+  JavaLocalFolderProvider
+  JavaContentScanner
+  JavaMetadataReader
+  JavaExporter
+  JavaMaterializer
+
+Engine
+  ProviderRegistry
+  SourceEngine
+  Scan orchestration
+  Cache/snapshot persistence
+  Generic indexing/search/projection
+  Generic action dispatch
+
+UI
+  Generic source and item surfaces
+  Provider/edition-specific detail sections
+```
+
+## Core Concepts
+
+### Local Folder Intake
+
+The folder picker should not decide the platform. A picked folder is a local
+access root; providers decide whether it contains Bedrock, Java, or another
+platform.
+
+```text
+User picks folder
+  -> provider registry asks local providers to probe it
+  -> strongest probe chooses provider, edition, and source root
+  -> source is stored as a local folder with providerID/accessDescriptor
+  -> scans route through the selected provider
+```
+
+This keeps filesystem access separate from Minecraft format knowledge. For
+example, selecting a wrapper folder that contains one Java modpack instance can
+resolve to the nested instance folder while still using local folder access.
+
+```swift
+struct SourceProbeResult {
+    let providerID: PlatformProviderID
+    let edition: MinecraftEdition
+    let confidence: SourceProbeConfidence
+    let sourceRootURL: URL
+    let displayName: String
+    let detectedKinds: Set<MinecraftContentKind>
+    let warnings: [String]
+}
+```
+
+### Provider
+
+A provider is the unit that knows a platform and access method. A provider can
+represent an edition/access pairing such as Bedrock local folder, Bedrock iOS
+device, or Java local folder.
+
+```swift
+protocol MinecraftPlatformProvider: Sendable {
+    var id: PlatformProviderID { get }
+    var displayName: String { get }
+
+    func accessDescriptor(for source: MinecraftSource) -> SourceAccessDescriptor
+    func accessStatus(for source: MinecraftSource) async -> SourceAccessStatus
+    func capabilities(for source: MinecraftSource) async -> SourceCapabilities
+
+    func scan(_ request: ProviderScanRequest) -> AsyncThrowingStream<ProviderEvent, Error>
+    func materialize(_ unit: MinecraftContentItem, in source: MinecraftSource) async throws -> URL
+    func export(_ unit: MinecraftContentItem, in source: MinecraftSource, request: ExportRequest) async throws -> URL
+}
+```
+
+The current `SourceAccessMethod` is already close to this role. The refactor
+should evolve it rather than replace the whole source system at once.
+
+### Content Unit
+
+The engine should pass around an edition-aware content unit with a strong common
+surface and boxed platform metadata.
+
+```swift
+struct MinecraftContentItem {
+    let id: URL
+    let folderURL: URL
+    let folderName: String
+    let sourceEdition: MinecraftEdition
+    let contentKind: MinecraftContentKind
+    let platformType: MinecraftPlatformContentType
+    let collectionRootURL: URL
+
+    var displayName: String
+    var iconURL: URL?
+    var modifiedDate: Date?
+    var sizeBytes: Int64?
+    var capabilities: ContentItemCapabilities
+    var platformMetadata: PlatformContentMetadata
+}
+```
+
+The model can retain compatibility shims during migration, but new code should
+prefer edition, kind, capabilities, and boxed metadata over Bedrock-only fields.
+
+### Metadata
+
+Generic UI should avoid flattening provider metadata. Platform details should be
+boxed and rendered by edition/provider-aware detail sections.
+
+```swift
+enum PlatformContentMetadata: Hashable, Sendable, Codable {
+    case bedrock(BedrockContentMetadata)
+    case java(JavaContentMetadata)
+    case none
+}
+```
+
+### Access Status
+
+Availability should be richer than local-vs-device.
+
+```swift
+enum SourceAccessMode: String, Hashable, Sendable, Codable {
+    case localFileSystem
+    case securityScopedLocalFolder
+    case usbDevice
+    case networkDevice
+    case archive
+    case unknown
+}
+
+struct SourceAccessStatus: Hashable, Sendable, Codable {
+    var availability: SourceAvailability
+    var mode: SourceAccessMode
+    var displayName: String
+    var iconSystemName: String
+    var statusText: String?
+    var warningText: String?
+}
+```
+
+### Event-Driven Scanning
+
+Providers should be able to stream discoveries, metadata, progress, and warnings.
+
+```swift
+enum ProviderEvent: Sendable {
+    case accessStatusChanged(SourceAccessStatus)
+    case stageUpdated(WorkStage)
+    case discovered(MinecraftContentItem)
+    case inspected(MinecraftContentItem)
+    case warning(ProviderWarning)
+}
+```
+
+The engine consumes events, updates source state, updates indexes, persists
+snapshots, and exposes UI-ready projections.
+
+### Source Candidate Discovery
+
+Source candidate discovery is separate from source content discovery. Candidate
+discovery answers whether a potential source exists in the current environment;
+content discovery scans an accepted source for worlds, packs, mods, and other
+items.
+
+```text
+Engine asks providers for source candidates
+  -> each provider uses its own bounded discovery process
+  -> providers stream candidate events
+  -> engine deduplicates and filters already-added sources
+  -> UI shows suggestions that the user can accept
+```
+
+For example, the Java local provider can check known macOS launcher roots and
+shallow-search likely instance folders, while Bedrock local folders can remain a
+no-op and rely on folder picking. Connected-device providers can later emit
+device-backed candidates from USB or network discovery.
+
+## Responsibilities
+
+### Engine Owns
+
+- Provider registration/routing.
+- Source candidate discovery orchestration and deduplication.
+- Source lifecycle and persistence.
+- Scan task ownership, cancellation, and worker limits.
+- Cache and snapshot persistence hooks.
+- Generic item search, sorting, counts, and projections.
+- Generic action dispatch and user-facing error normalization.
+
+### Provider Owns
+
+- Access method details.
+- Source candidate discovery strategy.
+- Discovery layout and content markers.
+- Metadata parsing.
+- Platform relationships.
+- Materialization.
+- Export formats.
+- Provider-specific progress stages and warnings.
+- Provider-specific detail metadata.
+
+## Current Fit
+
+Existing app pieces already map to this design:
+
+- `SourceAccessMethod`: provider-like boundary.
+- `SourceAccessCoordinator`: provider registry/router.
+- `SourceLibrary`: engine/orchestrator.
+- `MinecraftSource`: source session and persisted model.
+- `SourcePersistenceStore`: persistence.
+- `SourceContentIndexer`: generic indexing plus Bedrock-specific relationship
+  logic that should be split.
+- `ContentItemActionService` and `ContentPackageExporter`: action/export layer
+  that should become capability/provider aware.
+
+The main mismatch is that shared models and UI currently carry Bedrock-specific
+types and fields directly.

docs/provider-refactor-migration-plan.md

@@ -0,0 +1,92 @@
+# Provider Refactor Migration Plan
+
+This plan moves the app from a Bedrock-oriented source-access architecture to an
+engine/platform-provider architecture while keeping behavior working at each
+step.
+
+## Phase 1: Document and Name the Boundary
+
+- Add provider architecture documentation.
+- Add neutral model names alongside existing names:
+  - `MinecraftEdition`
+  - `MinecraftContentKind`
+  - `MinecraftPlatformContentType`
+  - `PlatformContentMetadata`
+  - `ContentItemCapabilities`
+  - `SourceAccessStatus`
+  - `WorkStage`
+  - `ProviderEvent`
+- Keep existing `MinecraftContentType` as a compatibility alias/wrapper until
+  call sites move.
+
+## Phase 2: Neutralize Content Items
+
+- Add edition, kind, platform type, capabilities, and platform metadata to
+  `MinecraftContentItem`.
+- Preserve existing Bedrock fields as computed compatibility accessors where
+  practical.
+- Move Bedrock world and pack metadata into `BedrockContentMetadata`.
+- Update search text to pull from generic fields and provider metadata.
+- Update tests/fixtures to construct items through the new neutral initializer.
+
+## Phase 3: Provider-Shaped Access
+
+- Introduce provider protocol types as a superset of current source access.
+- Adapt `SourceAccessMethod` to emit provider IDs and access status.
+- Register providers through a provider registry/coordinator.
+- Rename current generic local folder access to Bedrock local folder access.
+- Keep a compatibility typealias or wrapper named `LocalFolderSourceAccess` until
+  all call sites are migrated.
+
+## Phase 4: Split Bedrock Platform Module
+
+- Move Bedrock-specific scanner/metadata/export code under a Bedrock platform
+  namespace/folder.
+- Rename `WorldScanner` to `BedrockContentScanner`.
+- Rename `MinecraftContentMetadataReader` to `BedrockContentMetadataReader`.
+- Keep temporary wrappers for Quick Look and legacy call sites.
+- Move Bedrock relationship building out of generic indexing.
+
+## Phase 5: Event-Driven Scan Pipeline
+
+- Add provider events and work stages.
+- Let providers report progress stages.
+- Let the engine consume discovered/inspected events.
+- Preserve existing scan-stage behavior until provider events fully replace it.
+- Keep worker limits in the engine, with provider-declared concurrency policy as
+  a later extension.
+
+## Phase 6: Capability-Aware Actions
+
+- Move archive extension and portable export format selection off
+  `MinecraftContentType`.
+- Add item/provider capabilities for reveal/export/share/copy.
+- Adapt `ContentItemActionService` and exporters to route by provider/platform
+  type.
+- Keep Bedrock package output unchanged.
+
+## Phase 7: Java Local Provider
+
+- Add Java local provider as read-only initially.
+- Discover Java saves, resource packs, and datapacks.
+- Add Java metadata reader for `level.dat` and `pack.mcmeta` incrementally.
+- Export Java folder-backed content as `.zip` where supported.
+- Do not add Java-Bedrock conversion in this phase.
+
+## Phase 8: Cleanup
+
+- Remove compatibility aliases after UI, tests, Quick Look, and exporters use
+  provider-aware models.
+- Rename UI labels from Bedrock-specific categories where appropriate.
+- Add provider fixtures and contract tests.
+- Keep build/test verification passing after each phase.
+
+## Verification
+
+At each milestone:
+
+- Run Swift tests.
+- Run the app target build.
+- Check existing Bedrock local and connected-device behavior remains intact.
+- Add focused tests for model migration, indexing, export format selection, and
+  provider event consumption.