fix: declare prism-react-renderer as a direct dependency

It was being imported from components/liveHighlight.tsx,
components/prismLanguageSC.ts, and components/prismTheme.ts but only
resolved as a transitive of react-live-runner. Pinned to 1.3.5 because
the code uses the v1 API (default Highlight export plus named Prism
and Language exports), which v2 dropped.

Author: quantizor

package.json

@@ -30,6 +30,7 @@
     "invariant": "^2.2.4",
     "markdown-to-jsx": "^9.7.15",
     "next": "16.1.7",
+    "prism-react-renderer": "1.3.5",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-is": "^19.0.0",