fix(build): migrate to @tailwindcss/vite and remove conflicting postcss config

web/vite.config.ts

@@ -1,11 +1,13 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import tailwindcss from '@tailwindcss/vite'
 import { VitePWA } from 'vite-plugin-pwa'
 
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [
     react(),
+    tailwindcss(),
     VitePWA({
       registerType: 'autoUpdate',
       includeAssets: ['favicon.svg', 'robots.txt', 'apple-touch-icon.png'],