Bump next from 14.2.35 to 15.5.18 in /PolyLingua/ui

Bumps [next](https://github.com/vercel/next.js) from 14.2.35 to 15.5.18.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.35...v15.5.18)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.18
  dependency-type: direct:production
...

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

Author: dependabot[bot]

PolyLingua/ui/package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
-    "next": "14.2.35",
+    "next": "15.5.18",
     "@radix-ui/react-label": "^2.0.2",
     "@radix-ui/react-select": "^2.0.0",
     "@radix-ui/react-slot": "^1.0.2",