Changelog 2026-03-05 (Accessibility Theme Toggle + Status Feed Pass 7)

Changed

• Upgraded theme toggle behavior to announce state with aria-pressed, dynamic aria-label, and matching tooltip text.
• Ensured theme toggle state is initialized on page load even when no localStorage preference exists.
• Updated reliability incidents rendering from generic divs to semantic list markup (ul/li).
• Added aria-busy lifecycle handling on the reliability incidents region during async feed loading.

Why

• Improves screen-reader clarity for interactive state changes and makes dynamic reliability updates more semantically structured.