feat: add layout and sidebar components with navigation structure

chore: update dependencies and configuration for Tailwind CSS
docs: create components.json and skills-lock.json for project structure

frontend/vite.config.ts

@@ -1,10 +1,11 @@
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
+import tailwindcss from '@tailwindcss/vite';
 import path from 'path';
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [react(), tailwindcss()],
   resolve: {
     alias: {
       '@': path.resolve(__dirname, './src'),