feat(player): animate artwork transitions and immersive lyrics

Enlarge player artwork and transport controls, morph the cover into the lyrics and queue header, and minimize the player back into the mini player. Keep the larger header actions in lyrics and queue only.

Use larger lyrics with upper focus and progressive blur. Hide idle lyric controls after three seconds, restore them on interaction, and keep the normal player as the landscape entry page.

lib/widgets/mini_player.dart

@@ -27,6 +27,22 @@ class MiniPlayer extends ConsumerStatefulWidget {
 }
 
 class _MiniPlayerState extends ConsumerState<MiniPlayer> {
+  final _surfaceKey = GlobalKey();
+  final _artworkKey = GlobalKey();
+
+  Rect? _bounds(GlobalKey key) {
+    final box = key.currentContext?.findRenderObject();
+    if (box is! RenderBox || !box.attached || !box.hasSize) return null;
+    final overlay = Navigator.of(
+      context,
+      rootNavigator: true,
+    ).overlay?.context.findRenderObject();
+    return MatrixUtils.transformRect(
+      box.getTransformTo(overlay),
+      Offset.zero & box.size,
+    );
+  }
+
   // Hides the bar in the frames between a swipe-dismiss and the stopped
   // service clearing the media item (a dismissed Dismissible must leave the
   // tree immediately). Playing the same track again shows the bar normally.
@@ -69,6 +85,7 @@ class _MiniPlayerState extends ConsumerState<MiniPlayer> {
         controller.stop();
       },
       child: DecoratedBox(
+        key: _surfaceKey,
         position: DecorationPosition.foreground,
         decoration: BoxDecoration(
           border: mornye
@@ -85,10 +102,19 @@ class _MiniPlayerState extends ConsumerState<MiniPlayer> {
               : settingsGroupColor(context).withValues(alpha: 0.72),
           child: InkWell(
             onTap: () {
-              Navigator.of(
-                context,
-                rootNavigator: true,
-              ).push(NowPlayingRoute());
+              Navigator.of(context, rootNavigator: true).push(
+                NowPlayingRoute(
+                  miniPlayerGeometry: mornye
+                      ? () {
+                          if (!mounted) return null;
+                          final surface = _bounds(_surfaceKey);
+                          final artwork = _bounds(_artworkKey);
+                          if (surface == null || artwork == null) return null;
+                          return (surface: surface, artwork: artwork);
+                        }
+                      : null,
+                ),
+              );
             },
             child: Column(
               mainAxisSize: MainAxisSize.min,
@@ -108,6 +134,7 @@ class _MiniPlayerState extends ConsumerState<MiniPlayer> {
                       Hero(
                         tag: kNowPlayingArtworkHeroTag,
                         child: ClipRRect(
+                          key: _artworkKey,
                           borderRadius: BorderRadius.circular(6),
                           child: SizedBox(
                             width: context.tokens.coverMini,