feat: add expo mobile application source code

mobile/context/RefreshContext.tsx

@@ -0,0 +1,40 @@
+import React, { createContext, useContext, useState } from 'react';
+import { useAuth } from './AuthContext';
+import { ApiService } from '../services/api';
+
+interface RefreshContextType {
+  refreshing: boolean;
+  refreshAll: () => Promise<void>;
+}
+
+const RefreshContext = createContext<RefreshContextType | undefined>(undefined);
+
+export function RefreshProvider({ children }: { children: React.ReactNode }) {
+  const [refreshing, setRefreshing] = useState(false);
+  const { syncUser } = useAuth();
+
+  const refreshAll = async () => {
+    setRefreshing(true);
+    try {
+      // Sync User Data
+      await syncUser();
+      // You can add more global syncs here (e.g., config, notifications)
+    } catch (e) {
+      console.error('Global refresh failed', e);
+    } finally {
+      setRefreshing(false);
+    }
+  };
+
+  return (
+    <RefreshContext.Provider value={{ refreshing, refreshAll }}>
+      {children}
+    </RefreshContext.Provider>
+  );
+}
+
+export function useRefresh() {
+  const context = useContext(RefreshContext);
+  if (context === undefined) throw new Error('useRefresh must be used within a RefreshProvider');
+  return context;
+}