fixed stale state after logout and replayed or lost share intents

lib/app.dart

@@ -145,13 +145,14 @@ class _AppState extends State<App> with WidgetsBindingObserver {
   void _handlePendingShare() {
     if (!mounted) return;
     final share = ShareIntentListener.pending.value;
-    if (share == null) return;
+    if (share == null || ShareIntentListener.instance.isShown(share)) return;
     // A second share would otherwise leave the previous share-flow page
     // on top with stale (already-cleared) file paths.
     final navigator = Navigator.of(context);
     if (navigator.canPop()) {
       navigator.popUntil((route) => route.isFirst || route is PopupRoute);
     }
+    ShareIntentListener.instance.markShown(share);
     AppRoutes.openShareTarget(context, share);
   }
 
@@ -200,7 +201,6 @@ class _AppState extends State<App> with WidgetsBindingObserver {
         );
       }
       unawaited(_handlePendingWidgetNavigation());
-      ShareIntentListener.instance.attach();
       ShareIntentListener.pending.addListener(_handlePendingShare);
       _handlePendingShare();
       _syncChatListPolling();
@@ -261,7 +261,6 @@ class _AppState extends State<App> with WidgetsBindingObserver {
     PushTapRouter.pendingChatToken.removeListener(_onPushTapPending);
     PushTapRouter.pendingNewsletterId.removeListener(_onNewsletterTapPending);
     ShareIntentListener.pending.removeListener(_handlePendingShare);
-    ShareIntentListener.instance.detach();
     Main.bottomNavigator.removeListener(_onTabControllerChanged);
     WidgetsBinding.instance.removeObserver(this);
     super.dispose();