TypeScript error fixes:
- Fix UUID mock type in chunker.test.ts
- Remove invalid timestamp property from Message types in tests
- Fix mockFetch type in client.test.ts
- Add missing parameters property to tool definition in test
Accessibility fixes (109 → 40 warnings, remaining are CSS @apply):
- Add aria-labels to all toggle switches and icon-only buttons
- Add tabindex="-1" to all dialog elements with role="dialog"
- Add onkeydown handlers to modal backdrops for keyboard accessibility
- Fix form labels: change decorative labels to spans, use fieldset/legend for groups
- Convert fileInput variables to $state() for proper reactivity
- Fix closure captures in ThinkingBlock and HtmlPreview with $derived()
- Add role="region" to drag-and-drop zones
- Restore keyboard navigation to BranchNavigator
All 547 tests pass.
vikingowl
a564f7ec77