Stop active and queued generation on cancellation

[Ankit6149]

Advances #27 and #29 without claiming either issue complete.

Implemented:

• Studio generation now owns an AbortController and exposes a visible Cancel generation action
• browser abort propagates through /api/launch_kit into generateStudioPackage
• bounded destination lanes stop starting queued work after cancellation
• every supported hosted/local provider receives a linked caller-abort + timeout signal
• caller cancellation is distinct from provider timeout in the safe ProviderError contract
• cancelled regeneration preserves existing drafts/edits and records a distinct cancelled state
• cancelled destinations remain blocked from publishing and can be retried independently
• regression coverage verifies queue stop, cancellation-vs-timeout, API/provider propagation, and preserved draft state

Still open for #27:

• live per-destination queued/generating/revising/completed progress
• provider-specific concurrency policy / long-form scheduling
• request/duration/retry/model metrics
• full twelve-destination cancellation/stress acceptance

Still open for #29:

• live queued/generating/revising state persistence
• save/reopen acceptance for cancelled transitions
• dedicated keyboard/screen-reader acceptance

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1 Skipped Deployment

Project	Deployment	Actions	Updated
signal-flow-studio	Ignored	Preview	Sep 25, 2026 11:09am UTC