Stability and group-conversation improvements:

• Group mode now tells speakers apart by voice, with a new "How many people?" setting for more accurate labels
• Captions keep going through phone calls, Bluetooth connections, and sound alerts — and resume on their own
• Fixed captioning while a Bluetooth hearing aid or AirPods is connected
• Faster first-time setup with a smaller default model (Small is still available in Settings)
• The screen stays awake while captioning, and long conversations scroll more smoothly
• Fixes to transcript timestamps, model downloads, VoiceOver, and more