fix(pwa): add visibilitychange listener for Android sleep issues

src/app/page.tsx

@@ -54,6 +54,15 @@ export default function Home() {
 
         checkUser();
 
+        // Listen for visibility change (wake up from sleep)
+        const handleVisibilityChange = () => {
+            if (document.visibilityState === 'visible') {
+                console.log('[Auth] App became visible, refreshing session...');
+                checkUser();
+            }
+        };
+        document.addEventListener('visibilitychange', handleVisibilityChange);
+
         // Listen for auth changes
         const { data: { subscription } } = supabase.auth.onAuthStateChange((event, session) => {
             console.log('[Auth] State change event:', event, {
@@ -72,7 +81,10 @@ export default function Home() {
             }
         });
 
-        return () => subscription.unsubscribe();
+        return () => {
+            subscription.unsubscribe();
+            document.removeEventListener('visibilitychange', handleVisibilityChange);
+        };
     }, []);
 
     const fetchCollection = async () => {