Fix packages/ui lint issues

Signed-off-by: Émile Ré <emile@getprobo.com>

packages/ui/package.json

@@ -29,6 +29,7 @@
     "react-markdown": "^10.1.0",
     "rehype-raw": "^7.0.0",
     "remark-gfm": "^4.0.1",
+    "tailwind-merge": "^3.4.0",
     "tailwind-variants": "^1.0.0",
     "tailwindcss": "^4.1.7",
     "tw-animate-css": "^1.3.0",
@@ -51,7 +52,7 @@
     "@vitejs/plugin-react": "^4.4.1",
     "@vitest/browser": "^3.1.3",
     "@vitest/coverage-v8": "^3.1.3",
-    "eslint": "^9.25.0",
+    "eslint": "^9.39.2",
     "playwright": "^1.55.1",
     "react": "^19.1.0",
     "react-docgen": "^7.1.1",