Remove stale Replit catalog deps from mockup-sandbox

@replit/vite-plugin-cartographer and @replit/vite-plugin-runtime-error-modal
were removed from the workspace catalog during de-Replit-isation but remained
in mockup-sandbox/package.json, breaking pnpm install. Lockfile regenerated.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

artifacts/mockup-sandbox/package.json

@@ -38,8 +38,6 @@
     "@radix-ui/react-toggle": "^1.1.10",
     "@radix-ui/react-toggle-group": "^1.1.11",
     "@radix-ui/react-tooltip": "^1.2.8",
-    "@replit/vite-plugin-cartographer": "catalog:",
-    "@replit/vite-plugin-runtime-error-modal": "catalog:",
     "@tailwindcss/vite": "catalog:",
     "@types/node": "catalog:",
     "@types/react": "catalog:",