[WIP] Fix bug causing tasks to run indefinitely without timeout

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>🐛 Bug - Executing tasks run indefinitely; no timeout (hangs for 30+ minutes)</issue_title>
<issue_description>▶️ Watch the video (00:30)

Cc:
Hi Josh

Describe the Bug

When processing a 30-second video, the app's MCP starts executing tasks but they run for ~30 minutes and never finish. There is no timeout or failover, so the task appears to hang indefinitely.

To Reproduce

Steps to reproduce the behavior:

1. Open YakShaver Desktop.
2. Start a shave using the provided 30-second video: https://www.youtube.com/watch?v=KNWyjkeD4fc
3. Observe the executing tasks panel — tasks continue running for 30+ minutes and never complete.
4. No timeout is raised and there's no option to retry the task from the UI.

Expected Behavior

Tasks that run longer than a reasonable threshold should time out. After a timeout, the UI should allow the user to retry the task (e.g., a Retry button) and optionally provide a custom prompt for retry configuration.

Tasks

• Investigate
• Fix

More Information

• Reporter: Josh
• Suggested changes: Add a configurable timeout limit for task execution, display a timeout error when reached, and provide a Retry button in the UI that allows re-running the failed task (optionally with a custom prompt).

Environment

• App: YakShaver Desktop
• Video: 30-second repro video (link above)

Screenshots

N/A

Thanks!
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 🐛 Bug - Executing tasks run indefinitely; no timeout (hangs for 30+ minutes) #698

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