Visualize Spots, Point Color range and Visualize HDR are drawn on the
loupe's 1:1-8:1 window like mask overlays: the range and HDR views act
per pixel, the spots high pass reads within the window's margin. New
pipeline test: each overlay's window equals the whole-frame render's
pixels. The GPU finish kernel now soft-proofs output-space proofs
(destination and display gamut warnings) like the CPU; an output-device
profile's table still renders on the CPU. New GPU equivalence test.
Stacked on pr/zoom-detail (#1027).
Sources: own design.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
