- Grid layout for source controls: camera + switch on top row (equal
width), upload full-width below; preview area uses aspect-ratio 4/3
- "使用摄像头" no longer changes label text; uses is-active highlight only
- "切换摄像头" now actually cycles through real video devices via
enumerateDevices(); falls back to facingMode flip on mobile/single-cam;
button disabled until camera is active and ≥2 devices are detected
- Default-selects first sample image when drawer opens so "拍摄完成"
is immediately pressable without requiring a capture/upload first
- Fix: camera prompt text is now locked to CAMERA_STATE_PROMPTS[state]
and no longer overwritten by assistant replies
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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