fix: ignore job cancellation on notification

[jvsena42]

Related to #692

This PR prevents error notifications from being shown to users when the WakeNodeWorker job is cancelled.

Description

• Adds early return for CancellationException in WakeNodeWorker.doWork() failure handler
• Skips setting error notification content when work is cancelled
• Logs cancellation as debug instead of error since it's expected behavior

Preview

N/A - no UI changes

QA Notes

1. Trigger a push notification that wakes the node
2. Kill the app while the node is starting up
3. Verify no "Lightning error" notification is shown to the user
4. Check logs show "Work cancelled" debug message instead of error

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[ovitrif]

utAck