chore(deps): bump @tailwindcss/postcss from 4.2.1 to 4.2.2 in /frontend

Bumps [@tailwindcss/postcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-postcss) from 4.2.1 to 4.2.2.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/commits/v4.2.2/packages/@tailwindcss-postcss)

---
updated-dependencies:
- dependency-name: "@tailwindcss/postcss"
  dependency-version: 4.2.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package.json

@@ -34,7 +34,7 @@
     "zod": "^4.3.6"
   },
   "devDependencies": {
-    "@tailwindcss/postcss": "^4.2.1",
+    "@tailwindcss/postcss": "^4.2.2",
     "@types/node": "^25.5.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",