fix(mobile): update public menu URL format to https://menul.io/menu/:slug

apps/mobile/src/app/index.tsx

@@ -1,8 +1,8 @@
 import { useEffect, useState } from "react";
 import { router } from "expo-router";
 import { ActivityIndicator, View } from "react-native";
-import { api } from "@/lib/api";
-import { getActiveRestaurant, setActiveRestaurant } from "@/lib/active-restaurant";
+import { api, ApiError } from "@/lib/api";
+import { clearActiveRestaurant, getActiveRestaurant, setActiveRestaurant } from "@/lib/active-restaurant";
 import { supabase } from "@/lib/supabase";
 
 interface MeRestaurantResponse {
@@ -55,6 +55,19 @@ export default function Index() {
         }
       } catch (e) {
         console.warn("Index resolve error:", e);
+
+        // A 401 here means the cached session's token is no longer valid
+        // server-side (expired refresh token, deleted user, etc.) — that is
+        // not the same as "no restaurant yet", so send them to login instead
+        // of silently starting onboarding with a broken session.
+        if (e instanceof ApiError && e.status === 401) {
+          await clearActiveRestaurant();
+          await supabase.auth.signOut();
+          if (!cancelled) {
+            router.replace("/(auth)/login");
+          }
+          return;
+        }
       }
 
       if (!cancelled) {