Accessibility fixes
- Docs layouts render a visually hidden "Skip to Content" link as the first focusable element.
- Escape closes the mobile sidebar drawer, and focus returns to the trigger when the drawer closes.
- The heading "Copy Anchor Link" button is visible on keyboard focus.
- A
Tabidonly links to the tab by URL hash, panels keep the ids that tab triggers pointaria-controlsat. - Multi-word tab labels produce ids without spaces.
- TOC
singlemode highlights the clicked item and no longer skips headings while scrolling. DocsPageeditOnGithubdefaultsshatomainas documented.