fix: preserve pending permission requests across WebSocket reconnections (#462)

* fix: preserve pending permission requests across WebSocket reconnections

- Store WebSocketWriter reference in active sessions for reconnection
- Add reconnectSessionWriter() to swap writer when client reconnects
- Add getPendingApprovalsForSession() to query pending permissions by session
- Add get-pending-permissions WebSocket message handler on server
- Add pending-permissions-response handler on frontend
- Query pending permissions on WebSocket reconnect and session change
- Reconnect SDK output writer when client resumes an active session

* fix: address CodeRabbit review feedback for websocket-permission PR

- Use consistent session matching in pending-permissions-response handler,
  checking both currentSessionId and selectedSession.id (matching the
  session-status handler pattern)
- Guard get-pending-permissions with isClaudeSDKSessionActive check to
  prevent returning permissions for inactive sessions

src/components/chat/hooks/useChatRealtimeHandlers.ts

@@ -1080,6 +1080,19 @@ export function useChatRealtimeHandlers({
         break;
       }
 
+      case 'pending-permissions-response': {
+        // Server returned pending permissions for this session
+        const permSessionId = latestMessage.sessionId;
+        const isCurrentPermSession =
+          permSessionId === currentSessionId || (selectedSession && permSessionId === selectedSession.id);
+        if (permSessionId && !isCurrentPermSession) {
+          break;
+        }
+        const serverRequests = latestMessage.data || [];
+        setPendingPermissionRequests(serverRequests);
+        break;
+      }
+
       default:
         break;
     }