- Fix timelineSegments useMemo stale cache: the Perf-5 optimization used
timeline.linkedTimelines as its only dep, but that reference never changes
when events are added in-place; adding eventsLength as a dep makes it
recompute on every new live event so the binary search always finds the
new item
- Add LobbySkeleton: shimmer placeholder for space lobby (header + hero +
room list rows) shown while the Lobby chunk lazy-loads
- Add AuthSkeleton: shimmer placeholder for auth pages (logo + server
picker + form fields) shown while AuthLayout chunk lazy-loads
- Wire both into Router.tsx fallback props
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>