fix(album): overlay selection bar above navbar

test/track_list_tile_selection_test.dart

@@ -4,7 +4,9 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:spotiflac_android/l10n/app_localizations.dart';
 import 'package:spotiflac_android/models/track.dart';
+import 'package:spotiflac_android/screens/album_screen.dart';
 import 'package:spotiflac_android/widgets/animation_utils.dart';
+import 'package:spotiflac_android/widgets/selection_bottom_bar.dart';
 import 'package:spotiflac_android/widgets/track_detail_actions.dart';
 import 'package:spotiflac_android/widgets/track_list_tile.dart';
 
@@ -95,4 +97,51 @@ void main() {
 
     expect(enteredSelection, isTrue);
   });
+
+  testWidgets('album selection bar is mounted in front of the shell navbar', (
+    tester,
+  ) async {
+    await tester.binding.setSurfaceSize(const Size(430, 900));
+    addTearDown(() => tester.binding.setSurfaceSize(null));
+    var navbarTaps = 0;
+
+    await tester.pumpWidget(
+      ProviderScope(
+        child: MaterialApp(
+          localizationsDelegates: const [
+            AppLocalizations.delegate,
+            GlobalMaterialLocalizations.delegate,
+            GlobalWidgetsLocalizations.delegate,
+            GlobalCupertinoLocalizations.delegate,
+          ],
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: Scaffold(
+            extendBody: true,
+            body: const AlbumScreen(
+              albumId: 'album-1',
+              albumName: 'Album',
+              artistName: 'Artist',
+              tracks: [track],
+            ),
+            bottomNavigationBar: GestureDetector(
+              behavior: HitTestBehavior.opaque,
+              onTap: () => navbarTaps++,
+              child: const SizedBox(height: 80),
+            ),
+          ),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    await tester.ensureVisible(find.text('Selected song'));
+    await tester.longPress(find.text('Selected song'));
+    await tester.pumpAndSettle();
+
+    expect(find.byType(SelectionBottomBar), findsOneWidget);
+    await tester.tapAt(const Offset(2, 898));
+    await tester.pump();
+
+    expect(navbarTaps, 0);
+  });
 }