fix isolated tab handling

apps/weblibre/lib/features/geckoview/features/tabs/data/database/daos/tab.dart

@@ -525,12 +525,13 @@ class TabDao extends DatabaseAccessor<TabDatabase> with $TabDaoMixin {
     );
   }
 
-  Future<List<String>> getUnassignedTabsOlderThan(DateTime threshold) {
+  Future<List<String>> getUnassignedRegularTabsOlderThan(DateTime threshold) {
     final query = selectOnly(db.tab)
       ..addColumns([db.tab.id])
       ..where(
         db.tab.containerId.isNull() &
-            db.tab.timestamp.isSmallerThanValue(threshold),
+            db.tab.timestamp.isSmallerThanValue(threshold) &
+            db.tab.tabMode.equalsValue(TabModeDbValue.regular),
       );
 
     return query.map((row) => row.read(db.tab.id)!).get();

apps/weblibre/lib/features/geckoview/features/tabs/domain/repositories/tab.dart

@@ -277,7 +277,7 @@ class TabDataRepository extends _$TabDataRepository {
     final tabIds = await ref
         .read(tabDatabaseProvider)
         .tabDao
-        .getUnassignedTabsOlderThan(threshold);
+        .getUnassignedRegularTabsOlderThan(threshold);
 
     if (tabIds.isNotEmpty) {
       await ref.read(tabRepositoryProvider.notifier).closeTabs(tabIds);

apps/weblibre/lib/features/user/domain/presentation/dialogs/quit_browser_dialog.dart

@@ -30,7 +30,7 @@ Future<bool?> showQuitBrowserDialog(BuildContext context) {
         icon: const Icon(Icons.warning),
         title: const Text('Quit Browser'),
         content: const Text(
-          'This will properly shutdown the browser and clear private tabs',
+          'This will properly shutdown the browser and clear private tab data',
         ),
         actions: <Widget>[
           TextButton(

apps/weblibre/lib/features/user/domain/presentation/dialogs/switch_profile_dialog.dart

@@ -33,7 +33,7 @@ Future<bool?> showSwitchProfileDialog(
       icon: const Icon(Icons.warning),
       title: const Text('Switch User'),
       content: Text(
-        "Switching to User '$profileName' will require a restart of the Browser.",
+        "Switching to User '$profileName' will require a restart of the Browser.\n\nPrivate tab data will be cleared on restart.",
         style: const TextStyle(fontWeight: FontWeight.bold),
       ),
       actions: [

apps/weblibre/lib/utils/exit_app.dart

@@ -30,11 +30,12 @@ import 'package:weblibre/features/tor/domain/services/tor_proxy.dart';
 Future<void> exitApp(ProviderContainer container) async {
   logger.i('Preparing exit');
 
-  // 1. Close private/isolated tabs (clears browsing data for those contexts)
+  // 1. Close private tabs (clears browsing data for private contexts).
+  //    Isolated tabs are persistent and should survive app exit.
   try {
     await container
         .read(tabDataRepositoryProvider.notifier)
-        .closeAllTabs(includeRegular: false);
+        .closeAllTabs(includeRegular: false, includeIsolated: false);
     logger.i('Private tabs closed');
   } catch (e, st) {
     logger.e('Failed to close tabs', error: e, stackTrace: st);