Multi-provider transcription with side-by-side comparison.
Test guide:
1. Open Settings (gear icon) and set the Coordinator URL.
2. Add one or more Transcribers and Refiners.
3. Start recording, then Stop.
4. A comparison modal opens with all transcripts side by side.
5. Click Refine on any card to see refined versions below.
6. Click Insert to put any result into the target field.