Button used Tailwind's bare `transition` utility, whose default
property list includes background-color. Since the button's bg is a
CSS custom property recomputed every frame by the same 600ms hue
animation the main background uses, that extra transition smoothed it
on a different (~150ms) timing, so its color change didn't match the
page background's.
Add a btn-transition utility that mirrors Tailwind's default
transition list minus background-color, so the button's background
tracks the hue animation frame-for-frame like the rest of the app,
while hover/focus feedback (text color, ring, filter) still transitions
normally.
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