Claude
af69f98583
Streams previously prefetched every particle through an unbounded Firestore subscription. This adds a windowed source that anchors a `created_at desc` limit query at the newest particle and grows it backward on demand, so the already-seen history before a viewer's playback marker is no longer loaded. - `useWindowedStreamParticles`: tail-anchored live window that grows backward to cover the resume marker and to service `loadOlder()` (list scroll-up). Because the window always includes the newest particle, new arrivals stream in and forward playback never needs a fetch. Includes anti-eviction growth so a new tail particle never pushes loaded particles out of the window. - `useStreamPlayback`: consumes the windowed source instead of loading all children. New-tail and removal handling are derived from the children array (Firestore change events can't tell a genuine arrival from pagination backfill). Resume-from-marker waits for backward growth to reach an older marker; `prev` at the window edge pulls in older history. Playback resume, forward-only marker persistence, auto-advance-on-new, and removal fallback are all preserved. List view and progress indicator continue to render off the (now windowed) children; their pagination UX is a follow-up. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01V8gsmdVd7R8PJtn4UFnC4J