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* feat(video-export): L1 Hyperframes emitter + browser collection + export ZIP (#865) Consume the VideoTimeline IR (#864/#913) and produce a self-contained Hyperframes composition project that `npx hyperframes render` turns into an MP4 (render execution itself is #866). - lib/video-export/emit-hyperframes: pure IR → Hyperframes project emitter (one flat composition, one paused GSAP timeline on window.__timelines, spotlight/laser overlays from lib/choreography descriptors). Stays under the purity boundary; emits HTML/JS strings only. - lib/video-export/subtitles: SRT/VTT serialization of the IR subtitle track. - lib/video-export-app: impure app glue (DI adapters over Dexie, slide-snapshot collection lifted from #849, streaming ZIP packaging, useExportVideo hook). - Vendor GSAP locally (public/vendor/gsap.min.js) — determinism red-line. - Export menu entry with resolution select + i18n across all 8 locales. Verified end-to-end against the real hyperframes CLI: lint passes 0 errors on a real classroom export, and a rendered slice produces a valid H.264+AAC MP4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * feat(video-export): gate Export Video menu behind NEXT_PUBLIC_ENABLE_VIDEO_EXPORT flag The video export UI is experimental until the render pipeline (#866) lands, so hide the "Export Video" affordance behind an off-by-default feature flag. - Add isVideoExportEnabled() to lib/config/feature-flags (NEXT_PUBLIC_, so it inlines at build time for the client-side export menu). - Gate the Export Video block in header-controls on the flag. - Cover the new flag in tests/config/feature-flags.test.ts. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(video-export): ossKey fallback for evicted blobs + emitter dedup Address code-review findings on #931. - collect: resolveBytes() prefers the local Dexie blob and falls back to the record's CDN ossKey (audio) / ossKey+posterOssKey (media/poster) so a live-mode classroom whose local blobs were LRU-evicted still exports a self-contained ZIP. timeline-deps presence checks widened to `blob.size > 0 || !!ossKey` so the compiler keeps these entries instead of marking them absent; video-duration probe stays local-only. - emit-hyperframes: extract one shared escapeHtml + sec into format.ts, dropping the two divergent escapers (attr vs escapeHtml) and the two sec() definitions with different rounding, plus the middle-man escapeAttr. Output is byte-identical (snapshot unchanged). - Add tests/video-export/collect.test.ts (ossKey fallback, local-first, fetch 404/throw, video+poster). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(video-export): restore evicted generated media into base-frame snapshots Address review blocker (P1) on #931: the ossKey fallback covered standalone audio/video/image/poster asset entries but not the slide base-frame path. resolveGeneratedMedia only accepted a non-empty local blob, so a live-mode record with an evicted blob + valid ossKey had its image src cleared (and video/poster not restored) before slideToPng snapshotted the slide — the frame PNG lost the generated media even though the standalone asset was fetched. - resolveGeneratedMedia now resolves bytes via resolveBytes (local blob first, then ossKey / posterOssKey) before creating the snapshot object URLs. - Add frame-collection tests: evicted image restored via ossKey, evicted video+poster restored, and image with no ossKey still cleared. The renderer snapshot is mocked so the frame path runs in plain Node. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: wyuc <wang-yc24@mails.tsinghua.edu.cn>
