Add URL refresh strategy for storage sync pre-signed URLs

[sestinj]

Summary by cubic

Adds automatic refresh for storage sync pre-signed URLs to prevent expiry-related upload failures. The CLI refreshes proactively at 50 minutes and reacts to 403 errors, with safe concurrency and improved error handling.

• New Features
  • Tracks URL expiration and schedules refresh 10 minutes before expiry.
  • Triggers an immediate refresh when uploads return 403 Forbidden.
  • Prevents concurrent refresh calls with a lock; reschedules after successful refresh.
  • Clears refresh timers on stop and logs upload errors without stopping the service.
  • Updates docs with the URL Refresh Strategy and adds tests for 403-triggered refresh and concurrency.

^{Written for commit 02c3cc3. Summary will update automatically on new commits.}

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Documentation review completed. The PR already includes appropriate documentation updates in extensions/cli/docs/storage-sync.md:

• Updated the expiration section to reflect the 60-minute TTL
• Added a new "URL Refresh Strategy" section explaining the dual-strategy approach (proactive + reactive refresh)
• Removed the resolved item from "Open Questions & Future Enhancements"

The documentation changes are well-scoped and maintain consistency with the existing document structure. No additional documentation updates are needed.

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[cubic-dev-ai]

No issues found across 3 files

[sestinj]

🎉 This PR is included in version 1.33.0 🎉

The release is available on:

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• GitHub release

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[sestinj]

🎉 This PR is included in version 1.8.0 🎉

The release is available on:

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• GitHub release

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[sestinj]

🎉 This PR is included in version 1.37.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[sestinj]

🎉 This PR is included in version 1.7.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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