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();

frontend/services/notifications.tsx

@@ -5,6 +5,7 @@ import {
     onTokenRefresh,
     AuthorizationStatus,
 } from '@react-native-firebase/messaging';
+import notifee, { AndroidImportance } from '@notifee/react-native';
 import { post } from '@/services/api';
 
 export async function registerDeviceToken(authToken: string): Promise<void> {
@@ -32,4 +33,23 @@ export function listenForTokenRefresh(authToken: string): () => void {
     return onTokenRefresh(getMessaging(), async (newToken) => {
         await post('/device-tokens/register', { token: newToken }, authToken);
     });
+}
+
+export async function displayLocalNotification(title?: string, body?: string) {
+    if (!title && !body) return;
+
+    const channelId = await notifee.createChannel({
+        id: 'default',
+        name: 'General',
+        importance: AndroidImportance.HIGH,
+    });
+
+    await notifee.displayNotification({
+        title,
+        body,
+        android: {
+            channelId,
+            pressAction: { id: 'default' },
+        },
+    });
 }