feat: add LocaleProvider and hooks for managing locale and timezone settings

src/App.tsx

@@ -1,4 +1,5 @@
 import { Navigate, Route, Routes } from 'react-router'
+import { LocaleProvider } from './components/LocaleProvider'
 import { ThemeProvider } from './components/ThemeProvider'
 import { Toaster } from './components/ui/sonner'
 import { AuthProvider, useAuth } from './contexts/AuthContext'
@@ -139,14 +140,16 @@ function AppRoutes() {
 
 function App() {
   return (
-    <ThemeProvider defaultTheme="dark" storageKey="vite-ui-theme">
-      <AuthProvider>
-        <SocketProvider>
-          <AppRoutes />
-          <Toaster richColors />
-        </SocketProvider>
-      </AuthProvider>
-    </ThemeProvider>
+    <LocaleProvider defaultLocale="fr-FR" defaultTimezone="Europe/Paris">
+      <ThemeProvider defaultTheme="dark" storageKey="vite-ui-theme">
+        <AuthProvider>
+          <SocketProvider>
+            <AppRoutes />
+            <Toaster richColors />
+          </SocketProvider>
+        </AuthProvider>
+      </ThemeProvider>
+    </LocaleProvider>
   )
 }