Capture authored camera poses through the shared snapshot pipeline

[Aymericr]

External camera tools can now request a still from an explicit world-space pose, including roll and output framing, without moving the working viewport. Requests use the existing snapshot pipeline and receive correlated saved/failed events; queued frames restore scene visibility and materials before asynchronous readback.

Background captures no longer trigger manual capture feedback or close an unrelated capture overlay. Manual shutters queue behind uploads; dismissing capture releases movement, and viewport camera changes preserve queued authored frames while scene disposal cancels stale captures. The core barrel also exposes the existing synchronous edit context so external node systems can include derived edits in the originating undo/collaboration transaction. Sidebar rail buttons now expose accessible names and pressed state.

Validation: isolated frozen install with Bun 1.3.14; full lint, check-types, tests, and build passed. The final 19 targeted capture tests pass and cover framing, failures, queueing, restoration, and manual/background event separation.

[pascal]

I hit an error while handling your request (Model unavailable on AI Gateway free tier: Free tier users do not have access to this model. Upgrade to paid credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up for unrestricted…).

Please try again, rephrase, or reach out if it keeps failing.

Error id: 3f321fb0-5330-4797-b207-c4e63d42fdcc

[cursor]

Stale Bugbot comment from a previous run.

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 2 potential issues.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 88ef4f6. Configure here.}