fix(custom-widgets): refine v2 authoring

apps/docs/package.json

@@ -26,8 +26,10 @@
     "@docusaurus/plugin-content-docs": "^3.10.1",
     "@docusaurus/plugin-sitemap": "^3.10.1",
     "@docusaurus/preset-classic": "^3.10.1",
+    "@homarr/custom-widgets": "workspace:^",
     "@homarr/definitions": "workspace:^",
     "@homarr/workshop": "workspace:^",
+    "@mantine/core": "catalog:",
     "@mdx-js/react": "^3.1.1",
     "@nivo/line": "^0.99.0",
     "@scalar/api-reference-react": "catalog:",