feat: Implement multi-language system (ID/EN) for member dashboard

- Create translation files (locales/id.ts, locales/en.ts)
- Add LanguageContext with useLanguage hook
- Add LanguageToggle component in sidebar
- Default language: Indonesian (ID)
- Translate WalletDialog and TransactionDialog
- Language preference persisted in localStorage
- Type-safe translations with autocomplete

Next: Translate remaining pages (Overview, Wallets, Transactions, Profile)

apps/web/src/App.tsx

@@ -1,5 +1,6 @@
 import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom'
 import { AuthProvider, useAuth } from './contexts/AuthContext'
+import { LanguageProvider } from './contexts/LanguageContext'
 import { ThemeProvider } from './components/ThemeProvider'
 import { Toaster } from './components/ui/sonner'
 import { Dashboard } from './components/Dashboard'
@@ -59,9 +60,10 @@ export default function App() {
   return (
     <BrowserRouter>
       <ThemeProvider defaultTheme="light" storageKey="tabungin-ui-theme">
-        <AuthProvider>
-          <Toaster />
-          <Routes>
+        <LanguageProvider>
+          <AuthProvider>
+            <Toaster />
+            <Routes>
             {/* Public Routes */}
             <Route path="/auth/login" element={<PublicRoute><Login /></PublicRoute>} />
             <Route path="/auth/register" element={<PublicRoute><Register /></PublicRoute>} />
@@ -81,7 +83,8 @@ export default function App() {
             {/* Protected Routes */}
             <Route path="/*" element={<ProtectedRoute><Dashboard /></ProtectedRoute>} />
           </Routes>
-        </AuthProvider>
+          </AuthProvider>
+        </LanguageProvider>
       </ThemeProvider>
     </BrowserRouter>
   )