feat: Migrate to Tailwind CSS v4

vite.config.js

@@ -1,9 +1,13 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
+import tailwindcss from '@tailwindcss/vite'
 
 // https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [vue()],
+  plugins: [
+    vue(),
+    tailwindcss(),
+  ],
   server: {
     watch: {
       usePolling: true,