improve shutdown routine

app/lib/utils/exit_app.dart

@@ -20,25 +20,67 @@
 import 'dart:io';
 
 import 'package:flutter/services.dart';
+import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:riverpod/riverpod.dart';
+import 'package:weblibre/core/database_registry.dart';
 import 'package:weblibre/core/logger.dart';
 import 'package:weblibre/features/geckoview/features/tabs/domain/repositories/tab.dart';
+import 'package:weblibre/features/tor/domain/services/tor_proxy.dart';
 
 Future<void> exitApp(ProviderContainer container) async {
   logger.i('Preparing exit');
 
-  await container
-      .read(tabDataRepositoryProvider.notifier)
-      .closeAllTabs(includeRegular: false);
+  // 1. Close private/isolated tabs (clears browsing data for those contexts)
+  try {
+    await container
+        .read(tabDataRepositoryProvider.notifier)
+        .closeAllTabs(includeRegular: false);
+    logger.i('Private tabs closed');
+  } catch (e, st) {
+    logger.e('Failed to close tabs', error: e, stackTrace: st);
+  }
 
-  await SystemNavigator.pop();
-  logger.i('SystemNavigator popped');
+  // 2. Stop Tor proxy (only if it was initialized)
+  if (container.exists(torProxyServiceProvider)) {
+    try {
+      await container.read(torProxyServiceProvider.notifier).disconnect();
+      logger.i('Tor proxy stopped');
+    } catch (e, st) {
+      logger.e('Failed to stop Tor proxy', error: e, stackTrace: st);
+    }
+  }
 
+  // 3. Shutdown GeckoView engine. Must happen while the activity is still
+  //    attached so shutdown() can access the FragmentManager. Internally it:
+  //    a) removes the BrowserFragment via commitNow() (view teardown with
+  //       the runtime still alive),
+  //    b) stops component-level services (FxA, account manager),
+  //    c) shuts down GeckoRuntime (safe — no views reference it anymore).
+  try {
+    await GeckoBrowserService().shutdown();
+    logger.i('GeckoView engine shut down');
+  } catch (e, st) {
+    logger.e('Failed to shut down GeckoView', error: e, stackTrace: st);
+  }
+
+  // 4. Close all registered databases
+  try {
+    await DatabaseRegistry.instance.closeAll();
+  } catch (e, st) {
+    logger.e('Failed to close databases', error: e, stackTrace: st);
+  }
+
+  // 5. Dispose the Riverpod container (remaining sync cleanup).
+  //    This fires async onDispose callbacks (e.g. stream cancellations in
+  //    GeckoView services, viewport service) as fire-and-forget futures.
   container.dispose();
   logger.i('Provider container disposed');
 
-  await Future.delayed(const Duration(seconds: 1)).whenComplete(() {
-    logger.i('Bye !!1');
-    exit(0);
-  });
+  // 6. Signal the system to finish the activity and give fire-and-forget
+  //    async onDispose callbacks time to settle.
+  await SystemNavigator.pop();
+  await Future.delayed(const Duration(seconds: 1));
+
+  logger.i('Bye !!1');
+  exit(0);
 }