a1d4a96a0a
- drawMaskOverlay: reduce green overlay max alpha 140→80 (~31% opacity), lighten green from (0,200,0) to (60,220,60) so photo stays visible - resolveSheet: when auto-detect is ambiguous, try both green and black sheet modes, pick whichever produces non-trivial slab area (1%-99%) - Knob sliders: debounce full remask to 150ms; oninput redraws with previous mask (cheap), onchange triggers immediate full remask - Add onDestroy cleanup for debounce timeout Fixes: issue #55 — iPad mask preview nearly solid green, knobs laggy