UX Track 2 — Perceived speed: remaining slices

[os-zhuang]

Part of the 4-track top-tier-UX elevation effort. This track makes the app feel instant.

Shipped:

• feat(ux): optimistic detail edits + seed-from-cache (perceived speed) #137 optimistic detail edits + status transitions + seed-from-cache (no skeleton flash on prev/next & arrival)
• feat(ux): optimistic swipe-delete on list (perceived speed) #138 optimistic swipe-delete on the list
• perf(ux): drive Skeleton pulse on the reanimated UI thread #140 skeleton pulse moved to the reanimated UI thread (no per-frame re-renders)

Remaining:

• Prefetch-on-press — warm the detail query when a list row is pressed (or on press-in) so the detail paints from cache instantly. A usePrefetch hook already exists (hooks/usePrefetch.ts) but is per-component local state; needs a shared/module-level cache (or react-query prefetchQuery) so the list screen's prefetch is readable by the detail screen.
• Skeleton → content crossfade — when a list/detail finishes loading, fade the content in over the skeleton instead of a hard swap. Watch for double-animation with the existing entrance animations (detail sections already FadeInDown).
• Optimistic create — after submitting the create form, prepend the new record to the list optimistically (temp id) and reconcile on the server response; navigate back without waiting on a refetch.

Pattern reference: the optimistic snapshot-set-rollback approach in #137/#138 (app/(app)/[appName]/[objectName]/index.tsx, …/[id].tsx).