Fix overlay: Directionality widget + startListening state guard

- Wrap overlay Stack with Directionality (required above MaterialApp)
- Guard startListening() for IncomingData/StaleData states to prevent
  overlay dismissal when status reloads on app resume

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mitra_app/lib/core/chat/chat_request_notifier.dart

@@ -76,7 +76,15 @@ class ChatRequest extends _$ChatRequest {
   ChatRequestData build() => const ChatRequestIdleData();
 
   Future<void> startListening() async {
-    if (state is ChatRequestAcceptingData || state is ChatRequestAcceptedData) return;
+    // Don't reset state if showing a request, stale message, or actively accepting
+    if (state is ChatRequestIncomingData ||
+        state is ChatRequestStaleData ||
+        state is ChatRequestAcceptingData ||
+        state is ChatRequestAcceptedData) {
+      // Still reconnect WebSocket if needed, but don't change state
+      if (_channel == null) await _connectWebSocket();
+      return;
+    }
     _closeWebSocket();
     state = const ChatRequestListeningData();
     await _connectWebSocket();

mitra_app/lib/core/chat/widgets/chat_request_overlay.dart

@@ -79,7 +79,9 @@ class _ChatRequestOverlayState extends ConsumerState<ChatRequestOverlay>
       }
     });
 
-    return Stack(
+    return Directionality(
+      textDirection: TextDirection.ltr,
+      child: Stack(
         children: [
           widget.child,
         if (_visible) ...[
@@ -108,6 +110,7 @@ class _ChatRequestOverlayState extends ConsumerState<ChatRequestOverlay>
           ),
         ],
       ],
+      ),
     );
   }