fix(web): add @base-ui/react dependency

UI components require @base-ui/react which was missing from
dependencies, causing build failures on Vercel.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ArthurDEV44

apps/web/package.json

@@ -11,6 +11,7 @@
     "check-types": "tsc --noEmit"
   },
   "dependencies": {
+    "@base-ui/react": "^1.0.0",
     "@distill/shared": "workspace:*",
     "@react-three/drei": "^10.7.7",
     "@react-three/fiber": "^9.4.2",