refactor: remove artworkData BLOB from database, load artwork from files on demand

Artwork was stored inline in the tracks table (385MB / 98% of DB size for 8K tracks).
Now read directly from audio file metadata via AVAsset when needed, shrinking the DB to ~8MB.

Music/Models/Track.swift

@@ -22,7 +22,6 @@ nonisolated struct Track: Codable, Identifiable, Equatable, Hashable, Sendable {
     var bitrate: Int?
     var sampleRate: Int?
     var fileSize: Int64
-    var artworkData: Data?
     var playCount: Int
     var lastPlayedAt: Date?
     var rating: Int
@@ -66,7 +65,6 @@ extension Track {
         bitrate: Int? = 320,
         sampleRate: Int? = 44100,
         fileSize: Int64 = 5_000_000,
-        artworkData: Data? = nil,
         playCount: Int = 0,
         lastPlayedAt: Date? = nil,
         rating: Int = 0,
@@ -79,7 +77,7 @@ extension Track {
             albumArtist: albumArtist, album: album, genre: genre, year: year,
             trackNumber: trackNumber, discNumber: discNumber, duration: duration,
             bpm: bpm, composer: composer, fileFormat: fileFormat, bitrate: bitrate,
-            sampleRate: sampleRate, fileSize: fileSize, artworkData: artworkData,
+            sampleRate: sampleRate, fileSize: fileSize,
             playCount: playCount, lastPlayedAt: lastPlayedAt, rating: rating,
             dateAdded: dateAdded, dateModified: dateModified, fileHash: fileHash
         )

Music/Services/DatabaseService.swift

@@ -110,6 +110,12 @@ nonisolated final class DatabaseService: Sendable {
             }
         }
 
+        migrator.registerMigration("v4-drop-artworkData") { db in
+            try db.alter(table: "tracks") { t in
+                t.drop(column: "artworkData")
+            }
+        }
+
         try migrator.migrate(db)
     }
 

Music/Services/ScannerService.swift

@@ -90,8 +90,6 @@ final class ScannerService {
         var discNumber: Int?
         var bpm: Int?
         var composer = ""
-        var artworkData: Data?
-
         do {
             let metadata = try await asset.load(.metadata)
 
@@ -106,8 +104,6 @@ final class ScannerService {
                     if albumArtist == "Unknown" { albumArtist = val }
                 case .commonKeyAlbumName:
                     album = (try? await item.load(.stringValue)) ?? "Unknown"
-                case .commonKeyArtwork:
-                    artworkData = try? await item.load(.dataValue)
                 case .commonKeyCreator:
                     composer = (try? await item.load(.stringValue)) ?? ""
                 default:
@@ -184,7 +180,6 @@ final class ScannerService {
                 bitrate: bitrate,
                 sampleRate: sampleRate,
                 fileSize: fileSize,
-                artworkData: artworkData,
                 playCount: 0,
                 lastPlayedAt: nil,
                 rating: 0,

Music/Views/PlayerControlsView.swift

@@ -1,4 +1,5 @@
 import SwiftUI
+import AVFoundation
 
 struct PlayerControlsView: View {
     let currentTrack: Track?
@@ -20,6 +21,7 @@ struct PlayerControlsView: View {
 
     @State private var isDragging = false
     @State private var dragValue: Double = 0
+    @State private var artworkImage: NSImage?
 
     var body: some View {
         VStack(spacing: 0) {
@@ -38,6 +40,29 @@ struct PlayerControlsView: View {
             .padding(.vertical, 8)
         }
         .background(.bar)
+        .onChange(of: currentTrack?.id) {
+            loadArtwork()
+        }
+        .onAppear {
+            loadArtwork()
+        }
+    }
+
+    private func loadArtwork() {
+        guard let urlString = currentTrack?.fileURL,
+              let url = URL(string: urlString) else {
+            artworkImage = nil
+            return
+        }
+        Task.detached {
+            let asset = AVURLAsset(url: url)
+            let metadata = try? await asset.load(.metadata)
+            let data = try? await metadata?
+                .first { $0.commonKey == .commonKeyArtwork }?
+                .load(.dataValue)
+            let image = data.flatMap { NSImage(data: $0) }
+            await MainActor.run { artworkImage = image }
+        }
     }
 
     private var nowPlayingSection: some View {
@@ -46,9 +71,8 @@ struct PlayerControlsView: View {
                 .fill(.quaternary)
                 .frame(width: 44, height: 44)
                 .overlay {
-                    if let data = currentTrack?.artworkData,
-                       let nsImage = NSImage(data: data) {
-                        Image(nsImage: nsImage)
+                    if let artworkImage {
+                        Image(nsImage: artworkImage)
                             .resizable()
                             .aspectRatio(contentMode: .fill)
                     } else {

MusicTests/TrackTests.swift

@@ -27,7 +27,6 @@ struct TrackTests {
                 t.column("bitrate", .integer)
                 t.column("sampleRate", .integer)
                 t.column("fileSize", .integer).notNull()
-                t.column("artworkData", .blob)
                 t.column("playCount", .integer).notNull().defaults(to: 0)
                 t.column("lastPlayedAt", .datetime)
                 t.column("rating", .integer).notNull().defaults(to: 0)