Add voice-to-text transcription feature

[LakshmanTurlapati]

Summary

Added voice-to-text transcription to OpenCode CLI. Click "Notate", speak, click "Stop" - transcribed text appears in input.

Changes

• New: src/util/whisper.ts - Whisper API integration
• New: src/util/audio.ts - Audio recording (sox/arecord)
• Modified: src/config/config.ts - Optional whisper config
• Modified: src/cli/cmd/tui/component/prompt/index.tsx - Notate/Stop buttons

Requirements

brew install sox  # macOS
opencode auth login  # Uses existing OpenAI key

Usage

bun install && cd packages/opencode && bun dev

Click "Notate" → speak → click "Stop" → text appears ✨

[dzianisv]

This will be cool, if local whisper could be used, so no need in API keys and API usage. What do you think? Looks like this PR is abandoned, isn't it?