chore(deps)(deps): bump marked in /frontend/studyhub-app

Bumps [marked](https://github.com/markedjs/marked) from 17.0.6 to 18.0.4.
- [Release notes](https://github.com/markedjs/marked/releases)
- [Commits](markedjs/marked@v17.0.6...v18.0.4)

---
updated-dependencies:
- dependency-name: marked
  dependency-version: 18.0.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

frontend/studyhub-app/package-lock.json

@@ -66,7 +66,7 @@
     "idb": "^8.0.3",
     "katex": "^0.17.0",
     "lowlight": "^3.3.0",
-    "marked": "^17.0.5",
+    "marked": "^18.0.4",
     "posthog-js": "^1.376.0",
     "react": "^19.2.6",
     "react-dom": "^19.2.6",