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

web/package.json

@@ -23,6 +23,7 @@
   "devDependencies": {
     "@eslint/js": "^9.39.1",
     "@tailwindcss/postcss": "^4.1.18",
+    "@tailwindcss/vite": "^4.1.18",
     "@types/node": "^24.10.1",
     "@types/react": "^19.2.5",
     "@types/react-dom": "^19.2.3",
@@ -42,4 +43,4 @@
   "optionalDependencies": {
     "@rollup/rollup-linux-x64-musl": "^4.2.0"
   }
-}
+}