Close the small gaps: tests, demos, docs pages, VisuallyHidden and LiveRegion

Tests for DateCalendar, HelpText, RequiredMarker and ThaanaToggle.
Demos in the examples app for HelpText, RequiredMarker and ThaanaToggle.
Complete the ~12 docs pages missing a props table or accessibility section (e.g. form-context, use-listing-state, help-text, export-rows), and make the docs check catch it.
Public VisuallyHidden and LiveRegion (plus an announcer hook) in foundations, replacing the three private copies.

Close the small gaps: tests, demos, docs sections, VisuallyHidden and…

Done in e1e00f6 (merged in 7cc2335).

Tests: DateCalendar, HelpText, RequiredMarker and ThaanaToggle, plus direct tests for the providers, the media-query hooks and translate.
Demos: HelpText, RequiredMarker and ThaanaToggle, plus VisuallyHidden and LiveRegion.
Docs: 14 pages completed. scripts/check-docs.mjs now fails when a page lacks a Props table or an Accessibility section. Hook and function pages are exempt via front matter (reference: hook), and no-props / no-accessibility opt-outs need a reason.
A11y components: public VisuallyHidden, LiveRegion, useAnnouncer and announce(). The four private announcer/live-message copies are replaced.

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