Add a lightning bolt button next to the mic on the Timmy tab that opens
a bottom sheet for submitting paid jobs. The sheet includes:
- Text input for job prompts
- Estimate button (POST /api/jobs/estimate) showing cost in sats
- Submit button (POST /api/jobs) that creates the job
- BOLT-11 invoice rendered as QR code for Lightning wallet scanning
- 3s polling loop showing progress states (awaiting payment → paid → executing → complete)
- Expandable result card on completion
- Clear error states for rejected/failed/expired jobs
Works on iOS, Android, and web. Fixes#25
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>