Combobox active-option timing — BEFORE/AFTER
BEFORE = origin/main components/motion/combobox/context.tsx; AFTER = this PR. One sitting, dev server restarted across the swap.
Browser numbers are whole-frame. Simulator numbers are the web view only
(top rows cropped: safari-iphone 186, safari-ipad 172 — iOS status bar plus Safari chrome).

combobox-closed
    chrome-desktop : identical (max channel diff 0)
    chrome-mobile  : identical (max channel diff 0)
    safari-ipad    : identical (max channel diff 0)
    safari-iphone  : (not captured)

combobox-disabled-open
    chrome-desktop : max 108 at (453, 477), 29135 px differ, bbox (437, 463, 843, 643)
    chrome-mobile  : max 108 at (47, 469), 23519 px differ, bbox (31, 455, 359, 635)
    safari-ipad    : max 108 at (447, 1389), 116538 px differ, bbox (428, 1362, 1240, 1722)
    safari-iphone  : (not captured)

combobox-filtered-open
    chrome-desktop : identical (max channel diff 0)
    chrome-mobile  : identical (max channel diff 0)
    safari-ipad    : identical (max channel diff 0)
    safari-iphone  : (not captured)

combobox-moved-open
    chrome-desktop : identical (max channel diff 0)
    chrome-mobile  : identical (max channel diff 0)
    safari-ipad    : identical (max channel diff 0)
    safari-iphone  : (not captured)

combobox-open
    chrome-desktop : identical (max channel diff 0)
    chrome-mobile  : identical (max channel diff 0)
    safari-ipad    : identical (max channel diff 0)
    safari-iphone  : (not captured)

15 pairs across 5 scenes · worst max channel diff 108