fixed push notifications and auth modified

frontend/services/api.tsx

@@ -6,6 +6,14 @@ function authHeader(token?: string) {
     return token ? { Authorization: `Bearer ${token}` } : {};
 }
 
+let onUnauthorized: (() => void) | null = null;
+
+// Called once from AuthProvider so api.tsx can trigger a logout/relogin
+// when the backend rejects a request due to a missing/expired/invalid token.
+export function setUnauthorizedHandler(handler: (() => void) | null) {
+    onUnauthorized = handler;
+}
+
 async function request<T>(
     method: string,
     path: string,
@@ -30,6 +38,7 @@ async function request<T>(
         console.log('Failed URL:', res.url);
         console.log('Status:', res.status);
         console.log('Response:', errorText);
+        if (res.status === 401 && token) onUnauthorized?.();
         throw new Error(errorText);
     }
     return res.json();