Skip LEDs at the start/end of the strip are blacked out while the full screen perimeter is resampled onto the remaining active LEDs using linear interpolation. Calibration canvas tick labels show per-edge display ranges clipped to the active LED range. Moved LED offset control from inline overlay to a dedicated form row alongside the new skip inputs. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>