deps(npm-dev): bump vitest and @vitest/coverage-v8 to 5.0.0 in /ui (#104)

@vitest/coverage-v8 5.0.0 pins its vitest peer to exactly 5.0.0, so the two
packages must move together. Supersedes the individual bumps.

Author: rennerdo30

ui/package.json

@@ -52,13 +52,13 @@
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "@vitejs/plugin-react": "^6.0.1",
-    "@vitest/coverage-v8": "^4.1.0",
+    "@vitest/coverage-v8": "^5.0.0",
     "eslint": "^9",
     "eslint-config-next": "16.3.4",
     "jsdom": "^30.0.1",
     "tailwindcss": "^4",
     "typescript": "^6",
     "vite": "^8.1.0",
-    "vitest": "^4.1.0"
+    "vitest": "^5.0.0"
   }
 }