Place the overlay button inside the preview screen as a pill toggle,
add it as a tutorial step that auto-skips in device calibration mode.
Tutorial engine now skips hidden/missing targets in both directions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add explicit led_count to PictureColorStripSource (0 = auto from calibration)
- Stream pads with black or truncates to match led_count exactly
- Calibration dialog: show led_count input above visual editor in CSS mode
- Calibration dialog: pre-populate led_count with effective count (cal sum) when stored value is 0
- Calibration dialog: sync preview label live as led_count input changes
- CSS editor: group brightness/saturation/gamma into collapsible "Color Corrections" section
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>