## What kind of change does this PR introduce?
Chore / docs update. Related to DEPR-551. Stacked on #46053.
## What is the current behavior?
`Admonition` still accepts `label` as a backwards-compatible alias for
`title`, and a few www blog posts plus the Docs MkDocs admonition
transform still use or emit that alias.
## What is the new behavior?
Removes the `label` prop from `AdmonitionProps`, migrates the remaining
www blog Admonitions to `title`, and updates the Docs MkDocs transform
to emit `title` directly.
This leaves `title`, `description`, and `children` as the supported
Admonition content API.
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## Summary by CodeRabbit
* **Refactor**
* Admonition now uses a single required title prop for headings; the
legacy label prop is removed and no longer used.
* **Documentation**
* Updated docs and blog posts to pass admonition heading via title and
removed notes about label support.
* **Tests**
* Component tests adjusted to validate the new title-only behavior and
to ensure legacy label usage is rejected.
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---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
strictNullChecks was off for docs, which lets errors slip through and
leads to incorrect required/optional typing on Zod-inferred types. This
PR enables strictNullChecks and fixes all the existing violations.
* Add all missing libraries in the packages/apps.
* Add all missing Vitest imports to the tests.
* Add some missing exports to ui.
* Fix the admonition export.
* Fix various minor bugs.
* Migrate the ui package to use vitest.
* fix: streamline admonition types
Streamline types available for admonitions:
- Remove `info` and replace with `note`
- Add `deprecation`
Display the type on all admonitions, even if they have a label. Makes it
explicit what level of advice you are looking at (since color and icon
are ambiguous).
* change admonition to use alert under the hood
