fix(ui): allow landscape only in the full player

Keep application pages in portrait and let player sheets inherit rotation from the full player. Restore portrait on navigation, replacement, removal, and completed dismissal; discard stale minimization geometry when the screen rotates on close.

Validated with 12 Flutter tests and targeted analysis. iOS simulator build confirms portrait startup from a landscape device. Platform orientation restrictions still apply on large Android displays and multitasking iPads.

lib/screens/now_playing_screen.dart

@@ -17,6 +17,7 @@ import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/screens/downloaded_album_screen.dart';
 import 'package:spotiflac_android/screens/local_album_screen.dart';
 import 'package:spotiflac_android/services/library_database.dart';
+import 'package:spotiflac_android/services/app_orientation.dart';
 import 'package:spotiflac_android/services/music_player_service.dart';
 import 'package:spotiflac_android/theme/app_tokens.dart';
 import 'package:spotiflac_android/theme/mornye_theme.dart';
@@ -63,7 +64,11 @@ const _mornyeLyricFocusAlignment = 0.22;
 /// page follows the finger (via [startDrag]/[updateDrag]/[endDrag]) and
 /// settles open or pops based on release position and velocity.
 class NowPlayingRoute extends PageRoute<void> {
-  NowPlayingRoute({this.miniPlayerGeometry}) : super(fullscreenDialog: true);
+  NowPlayingRoute({this.miniPlayerGeometry})
+    : super(
+        fullscreenDialog: true,
+        settings: const RouteSettings(name: fullPlayerRouteName),
+      );
 
   /// Read at dismissal so rotation and collapsing navigation cannot leave a
   /// stale destination from when the player was opened.
@@ -188,7 +193,9 @@ class NowPlayingRoute extends PageRoute<void> {
     Widget child,
   ) {
     final target = _dismissTarget;
-    if (target != null) {
+    // Restoring portrait can resize the window during dismissal. Geometry
+    // captured in landscape no longer points at the mini player in that case.
+    if (target != null && _dismissStart?.size == MediaQuery.sizeOf(context)) {
       final progress = Curves.easeInOutCubic.transform(
         (1 - animation.value / _dismissStartValue).clamp(0.0, 1.0),
       );