✨ Restart Processing - Allow restarting the SSW.Tiger flow after cancellation

[ssw-yakshaver]

Requested by: @suiyangqiu via YakShaver.ai 🦬
cc: @yaqi-lyu, @suiyangqiu, @calumjs, @joshbermanssw

Hi Team!

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Pain

When the SSW.Tiger meeting processing flow is cancelled (either accidentally or due to an error), there is currently no way to restart it. This change adds a clear option to restart the processing flow after it has been cancelled, reducing frustration and avoiding the need for manual workarounds.

Acceptance Criteria

1. When a meeting processing flow has been cancelled, a visible 'Restart processing' button is available to users with appropriate permissions.
2. Clicking 'Restart processing' restarts the SSW.Tiger flow for the same meeting from the beginning.
3. The restart action sends a new processing card/status update, consistent with the initial processing behaviour.
4. If the flow is already running, the restart option is not shown or is disabled.
5. The system handles accidental double-clicks or repeated restart attempts gracefully without creating duplicate flows.
6. Audit/logging clearly records that the processing flow was restarted and by whom.