Add Electron main process with token management and navigation setup

- Implement main and login windows for Electron.
- Integrate `electron-store` for secure token storage and management.
- Setup IPC handlers for authentication.
- Update dependencies to support Electron, including `vite`, `react-router-dom`, and plugins.

electron/preload.ts

@@ -0,0 +1,15 @@
+const { contextBridge, ipcRenderer } = require('electron');
+
+// Exposer des APIs sécurisées au renderer process
+contextBridge.exposeInMainWorld('electron', {
+  platform: process.platform,
+
+  // Token management
+  getToken: () => ipcRenderer.invoke('get-token'),
+  setToken: (token: string) => ipcRenderer.invoke('set-token', token),
+  removeToken: () => ipcRenderer.invoke('remove-token'),
+
+  // Auth events
+  loginSuccess: (token: string) => ipcRenderer.send('login-success', token),
+  logout: () => ipcRenderer.send('logout'),
+});