Homepage fixes:
- Add loading state: show TaskListSkeleton while liveQuery loads
- Fix $derived(() => ...) anti-pattern → $derived.by()
- Stabilize date calculations (compute once, not per re-render)
- Remove double error check (mutation errors shown via toast)
TaskItem improvements:
- Show completed-at date (small, 50% opacity) on right side of
completed tasks
- Click completed date to toggle showing created-at date above it
Shared: Add `loading` field to useLiveQueryWithDefault (was missing,
prevented proper loading states in consumers)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
d9e2aeff99