The thumbnails-off-by-default toggle (6b5ea8257) left this test asserting
thumbnail content without enabling thumbnails, so it produced no thumbnail
content and failed. Enable thumbnailsEnabled for the case and reset it in
afterEach; the label ownership assertion is unchanged (TimelineClip owns names).
Dev-server thumbnail generation only probed three hardcoded system Chrome paths,
so on a machine with no system Chrome install (but a Puppeteer-cached
Chrome-for-Testing) it found no browser and every thumbnail request 500'd.
Resolve the executable from PUPPETEER_EXECUTABLE_PATH / CHROME_PATH / CHROME_BIN,
then a broader set of system browsers, then the Puppeteer cache (highest
version).
Background thumbnail generation (per-clip composition/video frame capture)
lags timeline scrubbing on long videos (#2428). Adds a persisted
thumbnailsEnabled setting, default OFF, so the timeline is snappy out of
the box; a toggle next to Fit in the zoom toolbar turns thumbnails on.
When off, clips render as plain bars (audio still shows its waveform).
## What changed
- adds a stage-aware review guide for plan, sketch, animation, and final-review states
- makes the review loop explicit: review frames → save feedback → reply in agent chat
- adds copyable agent handoff and approval messages
- keeps frame status agent-owned and presents planned frames before previews exist
- clarifies voiceover ownership, save state, feedback errors, and preview availability
- improves responsive layout and surfaces storyboard warnings without dominating the board
- adds unit coverage for review-stage and handoff-step derivation
## Why
Storyboard reviewers could leave comments, but the UI did not clearly explain when a pass was ready, what to inspect, or how saved feedback reaches the agent. This makes the human-to-agent iteration loop visible while preserving the existing file-based handoff.
## Impact
Users get a clear next action throughout the storyboard lifecycle and can copy the exact message needed to continue the agent workflow. The underlying storyboard and frame-comment formats are unchanged.
## Validation
- `bun run --filter @hyperframes/studio test --run src/components/storyboard/storyboardReviewStage.test.ts` — 13 tests passed
- `bun run --filter @hyperframes/studio typecheck`
- pre-commit: tracked artifacts, lint, formatting, Fallow audit, typecheck
Miguel Angel Simon Sierra