fix: address PR review comments for dependency consistency

Switch playground @liveblocks/core to @liveblocks/client to match other
manifests, and upgrade vite-node to ^6.0.0 for vite 8 compatibility.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: nperez0111

packages/xl-ai-server/package.json

@@ -61,7 +61,7 @@
     "typescript": "^5.9.3",
     "undici": "^6.22.0",
     "vite": "^8.0.3",
-    "vite-node": "^2.1.9",
+    "vite-node": "^6.0.0",
     "vite-plugin-eslint": "^1.8.1",
     "vite-plugin-externalize-deps": "^0.10.0",
     "vitest": "^4.1.2"

playground/package.json

@@ -29,7 +29,7 @@
     "@blocknote/xl-pdf-exporter": "workspace:^",
     "@emotion/react": "11.14.0",
     "@emotion/styled": "11.14.1",
-    "@liveblocks/core": "^3.17.0",
+    "@liveblocks/client": "^3.17.0",
     "@liveblocks/react": "^3.17.0",
     "@liveblocks/react-blocknote": "^3.17.0",
     "@liveblocks/react-tiptap": "^3.17.0",