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/main.dart

@@ -23,6 +23,7 @@ import 'package:spotiflac_android/services/share_intent_service.dart';
 import 'package:spotiflac_android/services/cover_cache_manager.dart';
 import 'package:spotiflac_android/services/app_state_database.dart';
 import 'package:spotiflac_android/services/app_navigation_service.dart';
+import 'package:spotiflac_android/services/app_orientation.dart';
 import 'package:spotiflac_android/services/music_player_service.dart';
 import 'package:spotiflac_android/services/player_widget_service.dart';
 import 'package:spotiflac_android/screens/now_playing_screen.dart';
@@ -42,6 +43,7 @@ void main() {
   runZonedGuarded(
     () async {
       WidgetsFlutterBinding.ensureInitialized();
+      await setAppOrientation();
       LicenseRegistry.addLicense(() async* {
         yield LicenseEntryWithLineBreaks(const [
           'Inter',