feat: add App Intents and device control widget

src/context/AuthContext.tsx

@@ -1,6 +1,7 @@
 import React, { createContext, useContext, useState, useEffect, useCallback } from 'react';
 import AsyncStorage from '@react-native-async-storage/async-storage';
 import api from '../services/api';
+import { syncDevicesToWidget } from '../services/widgetSync';
 import { AuthResponse, User } from '../types';
 
 interface AuthContextType {
@@ -103,6 +104,7 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
   const logout = async () => {
     try {
       await clearSession();
+      syncDevicesToWidget([]);
     } catch (error) {
       console.error('Failed to logout', error);
     }