Update frontend dependencies, enhance Vite configuration, and refactor components

- Added new dependencies including @base-ui/react, @fontsource-variable/geist, and tailwindcss for improved UI and styling.
- Updated Vite configuration to include path aliasing for easier imports.
- Refactored App.jsx to implement a theme context and improved routing structure.
- Enhanced various components (e.g., ConfirmDialog, DataTable) to utilize new UI components and improve user experience.
- Cleaned up CSS imports and ensured proper styling integration.

Made-with: Cursor

frontend/vite.config.js

@@ -1,9 +1,18 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
 
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react()],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
   build: {
     chunkSizeWarningLimit: 2000,
   },