- AppSheet: Escape closes any sheet branch; non-modal/inline sheets move focus into panel on open; modal<->inline transition keeps overlay stack - Task detail: initial focus on close button; note textarea aria-label - Global sr-only status region for toast announcements (visual toast hidden from AT to avoid double reading) - Focus view: drop duplicate topbar h1 (page keeps its own single h1) - Archived lists toggle hidden until loaded (no more 'archived 0' flash) - Touch: date-clear/time-remove 44px; edit/preview switch hit area 44px with 3px gap; calendar filter row gets a scroll-right mask hint