iOS 1.0.2: shuffle the whole library from Songs

Shuffle used only the pages loaded so far (the A and B songs). It now
asks Plex for 1000 random tracks from the whole library.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ios/Stemify/UI/Screens/LibraryScreens.swift

@@ -235,6 +235,14 @@ struct SongsScreen: View {
     @State private var error: String?
     private var g: AppGraph { .shared }
 
+    /// Shuffles the whole library, not just the pages loaded so far.
+    private func shuffleAll() {
+        Task {
+            do { g.playback.playTracks(try await g.plex.randomTracks(1000), shuffle: true) }
+            catch { g.playback.report("Couldn't load songs: \(error.localizedDescription)") }
+        }
+    }
+
     var body: some View {
         Page(title: "Songs") {
             if !tracks.isEmpty {
@@ -242,7 +250,7 @@ struct SongsScreen: View {
                     Text(songs(total)).font(.subheadline).foregroundStyle(p.label2).padding(.leading, MARGIN).padding(.bottom, 12)
                 }
                 PlayShuffle(play: { g.playback.playTracks(Array(tracks.prefix(1000))) },
-                            shuffle: { g.playback.playTracks(Array(tracks.prefix(1000)), shuffle: true) })
+                            shuffle: shuffleAll)
                     .padding(.bottom, 12)
             }
             ForEach(Array(tracks.enumerated()), id: \.element.id) { i, t in