Storybook Upstream Sync Checker

Analyze recent changes in the official storybookjs/storybook repository and identify which ones may need to be synced to this storybook-rsbuild repo. The storybook-rsbuild project adapts Storybook's official builder and framework packages to work with Rsbuild, so when upstream changes builder-webpack5, builder-vite, or framework integrations, those changes may need to be reflected here.

Upstream to Local Package Mapping

+----------------------------------------+--------------------------------------+
| Upstream (storybookjs/storybook)       | Local (storybook-rsbuild)            |
+----------------------------------------+--------------------------------------+
| code/builders/builder-webpack5         | packages/builder-rsbuild             |
| code/builders/builder-vite             | packages/builder-rsbuild             |
| code/frameworks/react-vite             | packages/framework-react             |
| code/frameworks/react-webpack5         | packages/framework-react             |
| code/frameworks/vue3-vite              | packages/framework-vue3              |
| code/frameworks/web-components-vite    | packages/framework-web-components    |
| code/lib/core-webpack                  | packages/builder-rsbuild (prebundled)|
+----------------------------------------+--------------------------------------+