implemented native share intent support for android and ios with chat and folder pickers

lib/app.dart

@@ -14,6 +14,7 @@ import 'notification/notification_controller.dart';
 import 'notification/notification_tasks.dart';
 import 'notification/notify_updater.dart';
 import 'routing/app_routes.dart';
+import 'share_intent/share_intent_listener.dart';
 import 'state/app/modules/app_modules.dart';
 import 'state/app/modules/breaker/bloc/breaker_bloc.dart';
 import 'state/app/modules/chat_list/bloc/chat_list_bloc.dart';
@@ -67,6 +68,20 @@ class _AppState extends State<App> with WidgetsBindingObserver {
     AppRoutes.goToTab(context, Modules.timetable);
   }
 
+  void _handlePendingShare() {
+    if (!mounted) return;
+    final share = ShareIntentListener.pending.value;
+    if (share == null) return;
+    // A second share arriving while a previous share-flow page is still on
+    // the stack would otherwise leave the old page sitting on top with stale
+    // (already-cleared) file paths. Reset to the tab root before pushing.
+    final navigator = Navigator.of(context);
+    if (navigator.canPop()) {
+      navigator.popUntil((route) => route.isFirst);
+    }
+    AppRoutes.openShareTarget(context, share);
+  }
+
   @override
   void initState() {
     super.initState();
@@ -112,6 +127,9 @@ class _AppState extends State<App> with WidgetsBindingObserver {
         );
       }
       unawaited(_handlePendingWidgetNavigation());
+      ShareIntentListener.instance.attach();
+      ShareIntentListener.pending.addListener(_handlePendingShare);
+      _handlePendingShare();
     });
 
     _updateTimings = Timer.periodic(const Duration(seconds: 30), (_) {
@@ -158,6 +176,8 @@ class _AppState extends State<App> with WidgetsBindingObserver {
     _refetchChats.cancel();
     _updateTimings.cancel();
     _timetableWidgetSync?.cancel();
+    ShareIntentListener.pending.removeListener(_handlePendingShare);
+    ShareIntentListener.instance.detach();
     Main.bottomNavigator.removeListener(_onTabControllerChanged);
     WidgetsBinding.instance.removeObserver(this);
     super.dispose();