feat: refactor nxmesh-frontend to use React Router with new layout components

- Updated package.json to replace Vite with React Router for development and build scripts.
- Added react-router.config.ts for configuration settings.
- Created a new App component with a dashboard layout including header, sidebar, and footer.
- Enhanced App.css with a professional theme and responsive design.
- Removed old App.tsx and index.css files.
- Introduced RootLayout component to encapsulate layout structure.
- Developed Header, Footer, and Sidebar components for consistent layout.
- Implemented routes for home and dashboard with key metrics and activity sections.
- Updated vite.config.ts to integrate React Router and adjust SSR settings.

apps/nxmesh-frontend/react-router.config.ts

@@ -0,0 +1,8 @@
+import type { Config } from '@react-router/dev/config';
+
+export default {
+  // Config options...
+  // Server-side render by default, to enable SPA mode set this to `false`
+  ssr: false,
+  appDirectory: 'src',
+} satisfies Config;