Add always-on-top mini recorder + bake default Worker URL Mini recorder: floating pill window (340x64) appears when recording starts, main window hides. Shows timer, stop, screenshot, and expand controls. IPC bridge between main and mini renderers via main process. Baked default Worker URL so transcription works out of the box. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>