[all components][docs] Document missing transition data attributes

[atomiks]

• I have followed (at least) the PR section of the contributing guide.

[mui-bot]

Bundle size report

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+285B(+0.06%)	🔺+94B(+0.06%)

Details of bundle changes

---

Check out the code infra dashboard for more information about this PR.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/@base-ui/react@4098
  

  pnpm add https://pkg.pr.new/@base-ui/utils@4098
  

commit: c43a063

[netlify]

✅ Deploy Preview for base-ui ready!

Name	Link
🔨 Latest commit	21b248c
🔍 Latest deploy log	https://app.netlify.com/projects/base-ui/deploys/6992ebb1db85fa00084257b8
😎 Deploy Preview	https://deploy-preview-4098--base-ui.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[greptile-apps]

Greptile Summary

This PR documents previously missing transition-related data attributes (data-starting-style and data-ending-style) across 10 components. The changes are purely documentation additions - creating new DataAttributes.ts files for components that had none, and updating existing files to include transition attributes. All corresponding generated JSON documentation files and the main components page have been updated to reflect these additions.

The implementation follows established patterns:

• Transition attributes are imported from TransitionStatusDataAttributes for simple components
• Drawer components use CommonPopupDataAttributes which includes both transition and open/closed state attributes
• Generated documentation and MDX files are automatically updated to reflect the TypeScript changes

No functional changes to component behavior.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• This is a documentation-only PR that adds missing transition data attribute documentation across components. All changes follow consistent patterns, properly reference shared enums from utility files, and the generated JSON files correctly reflect the TypeScript definitions. No behavioral changes to components.
• No files require special attention

Important Files Changed

Filename	Overview
packages/react/src/avatar/fallback/AvatarFallbackDataAttributes.ts	Adds transition data attributes (starting-style, ending-style) for Avatar Fallback component
packages/react/src/avatar/image/AvatarImageDataAttributes.ts	Adds transition data attributes (starting-style, ending-style) for Avatar Image component
packages/react/src/drawer/backdrop/DrawerBackdropDataAttributes.ts	Adds transition and open/closed state data attributes for Drawer Backdrop component
packages/react/src/drawer/popup/DrawerPopupDataAttributes.ts	Adds transition and open/closed state data attributes for Drawer Popup component
packages/react/src/drawer/viewport/DrawerViewportDataAttributes.ts	Adds transition, open/closed, and nesting-related data attributes for Drawer Viewport component
packages/react/src/field/error/FieldErrorDataAttributes.ts	Adds transition data attributes (starting-style, ending-style) to existing Field Error attributes
packages/react/src/tabs/panel/TabsPanelDataAttributes.ts	Adds transition data attributes (starting-style, ending-style) to existing Tabs Panel attributes
docs/src/app/(docs)/react/components/page.mdx	Updated component documentation with newly added transition data attributes

_{Last reviewed commit: cc0c756}

[LukasTy]

Nitpick: did you go for dialog here since there are other cases of this data attributes on other role="dialog" components?

[atomiks]

No, this was incorrect as DrawerViewport doesn't have this variable. I've removed it (and if it did have it, it'd be named as drawer)

[greptile-apps]

Automatic reviews are disabled for this repository.