fix(android): AlbumDetail shuffle button actually shuffles

The Shuffle button on AlbumDetail was wired to the same code path
as Play — both called `play(startTrackId = null)` which started the
queue in track order. PlaylistDetail already does inline `.shuffled()`
for shuffle; mirror that on AlbumDetail via a new `shuffle()` VM
method that pre-shuffles the track list before handing it to the
player.

A future refinement could use Media3's `setShuffleModeEnabled` for
play-then-shuffle without disturbing the original queue ordering,
but pre-shuffling matches the existing PlaylistDetail behavior and
keeps both screens consistent.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/library/ui/AlbumDetailScreen.kt

@@ -87,7 +87,7 @@ fun AlbumDetailScreen(
                         albumLiked = albumLiked,
                         likedTrackIds = likedTrackIds,
                         onPlayAll = { viewModel.play(startTrackId = null) },
-                        onShuffleAll = { viewModel.play(startTrackId = null) },
+                        onShuffleAll = viewModel::shuffle,
                         onTrackClick = { id -> viewModel.play(startTrackId = id) },
                         onToggleAlbumLike = viewModel::toggleLikeAlbum,
                         onToggleTrackLike = viewModel::toggleLikeTrack,

android/app/src/main/java/com/fabledsword/minstrel/library/ui/AlbumDetailViewModel.kt

@@ -90,6 +90,23 @@ class AlbumDetailViewModel @Inject constructor(
         )
     }
 
+    /**
+     * Play the album in shuffled order. Pre-shuffles the list and hands
+     * the result to the player — matches the PlaylistDetail shuffle
+     * pattern. A future refinement could use Media3's
+     * `setShuffleModeEnabled` for play-then-shuffle without disturbing
+     * the original queue ordering.
+     */
+    fun shuffle() {
+        val detail = (internal.value as? AlbumDetailUiState.Success)?.detail ?: return
+        if (detail.tracks.isEmpty()) return
+        player.setQueue(
+            tracks = detail.tracks.shuffled(),
+            initialIndex = 0,
+            source = "album:${detail.album.id}",
+        )
+    }
+
     fun toggleLikeAlbum() {
         val desired = !albumLiked.value
         viewModelScope.launch {