reset mobile context caches on user identity changes

apps/mobile/src/contexts/NotificationsContext.tsx

@@ -6,7 +6,7 @@ import React, {
   useCallback,
   useRef,
 } from "react";
-import { useAuth } from "@clerk/clerk-expo";
+import { useAuth, useUser } from "@clerk/clerk-expo";
 import {
   fetchNotifications,
   fetchUnreadCount,
@@ -37,6 +37,7 @@ export function NotificationsProvider({
   children: React.ReactNode;
 }) {
   const { getToken, isSignedIn } = useAuth();
+  const { user } = useUser();
   const [notifications, setNotifications] = useState<Notification[]>([]);
   const [unreadCount, setUnreadCount] = useState(0);
   const [loading, setLoading] = useState(false);
@@ -160,6 +161,19 @@ export function NotificationsProvider({
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [isSignedIn]); // Only run when sign-in state changes
 
+  useEffect(() => {
+    setNotifications([]);
+    setUnreadCount(0);
+    setLoading(false);
+    fetchInProgressRef.current = false;
+    lastFetchTimeRef.current = 0;
+    if (user?.id) {
+      log.debug("Notifications state reset for user", { userId: user.id });
+    } else {
+      log.debug("Notifications state reset on sign-out");
+    }
+  }, [user?.id]);
+
   // Periodic refresh every 30 seconds
   useEffect(() => {
     if (!isSignedIn) return;