perf: use cached user data for faster login redirect

contexts/AuthContext.tsx

@@ -46,6 +46,30 @@ export const AuthProvider: React.FC<AuthProviderProps> = ({ children }) => {
       return;
     }
 
+    // Try to load cached user first for faster initial render
+    const cachedUser = storage.get(STORAGE_KEYS.USER);
+    if (cachedUser) {
+      try {
+        const parsedUser = JSON.parse(cachedUser);
+        setUser(parsedUser);
+        setIsLoading(false);
+
+        // Refresh user data in background (don't block UI)
+        authService.getCurrentUser()
+          .then(userData => {
+            setUser(userData);
+            storage.set(STORAGE_KEYS.USER, JSON.stringify(userData));
+          })
+          .catch(error => {
+            console.error('Error refreshing user:', error);
+            // If refresh fails, keep cached user
+          });
+        return;
+      } catch (e) {
+        // Invalid cached data, continue to fetch
+      }
+    }
+
     try {
       const userData = await authService.getCurrentUser();
       setUser(userData);