Dorian 4706dd16e7 release(v1.7.17-alpha): cancel download + stall detection ...

Add Cancel Download button + stall detection so a wedged download can
be recovered instead of leaving the UI stuck on a frozen progress bar.

Backend:
- update.rs: DOWNLOAD_CANCEL AtomicBool + DOWNLOAD_PROGRESS_AT AtomicU64
- download loop checks cancel between chunks and during retry backoff
  (500ms slices instead of one exponential sleep, so Cancel wakes fast)
- cancel_download() wipes staging + clears update_in_progress
- update.status exposes download_progress.stalled (30s no-progress)
- RPC: update.cancel-download + dispatcher entry

Frontend:
- SystemUpdate.vue: Cancel Download button, amber stall styling,
  stalled copy, cancel-download confirm branch in modal
- i18n keys (en + es) for cancel/stall flow
- v1.7.17-alpha What's New block in AccountInfoSection

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-20 19:10:34 -04:00

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