feat(app): 完善播放协议搜索与空状态

test/following/following_page_test.dart

@@ -129,13 +129,16 @@ void main() {
     await tester.tap(find.byKey(const Key('following-edit')));
     await tester.pumpAndSettle();
     expect(
-      find.byKey(const Key('following-remove-the-signal-demo')),
+      find.byKey(const Key('following-select-the-signal-demo')),
       findsOneWidget,
     );
+    expect(find.byKey(const Key('following-cancel-follow')), findsOneWidget);
 
-    await tester.tap(find.byKey(const Key('following-remove-the-signal-demo')));
+    await tester.tap(find.byKey(const Key('following-card-the-signal-demo')));
     await tester.pumpAndSettle();
-    expect(find.byType(AlertDialog), findsOneWidget);
+    await tester.tap(find.byKey(const Key('following-cancel-follow')));
+    await tester.pumpAndSettle();
+    expect(find.text('Unfollow the selected dramas?'), findsOneWidget);
     await tester.tap(
       find.descendant(
         of: find.byType(AlertDialog),
@@ -145,7 +148,7 @@ void main() {
     await tester.pumpAndSettle();
 
     expect(
-      find.byKey(const Key('following-remove-the-signal-demo')),
+      find.byKey(const Key('following-select-the-signal-demo')),
       findsNothing,
     );
     expect(find.byIcon(Icons.edit_outlined), findsOneWidget);
@@ -159,6 +162,47 @@ void main() {
     expect(find.byKey(const Key('following-history-empty')), findsOneWidget);
   });
 
+  testWidgets('should_unfollow_every_selected_drama_when_edit_confirms', (
+    tester,
+  ) async {
+    _signIn();
+    final catalog = FakeCatalogRepository();
+    final dramas = catalog.dramas.take(2).toList();
+    final favorites = InMemoryFavoriteRepository(
+      cards: dramas,
+      saved: dramas.map((drama) => drama.id).toSet(),
+    );
+    await tester.pumpWidget(_app(catalog: catalog, favorites: favorites));
+    await tester.pumpAndSettle();
+    await tester.tap(find.byKey(const Key('tab-follow')));
+    await tester.pumpAndSettle();
+    await tester.tap(find.byKey(const Key('following-edit')));
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.byKey(const Key('following-select-all')));
+    await tester.pumpAndSettle();
+    await tester.tap(find.byKey(const Key('following-cancel-follow')));
+    await tester.pumpAndSettle();
+    await tester.tap(
+      find.descendant(
+        of: find.byType(AlertDialog),
+        matching: find.byType(FilledButton),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(
+      find.byKey(const Key('following-card-the-signal-demo')),
+      findsNothing,
+    );
+    expect(
+      find.byKey(const Key('following-card-city-lights-demo')),
+      findsNothing,
+    );
+    expect(find.byIcon(Icons.edit_outlined), findsOneWidget);
+    expect(favorites.removeManyCalls, 1);
+  });
+
   testWidgets('should_show_auth_gate_when_signed_out', (tester) async {
     SharedPreferencesAsyncPlatform.instance =
         InMemorySharedPreferencesAsync.empty();