Hold (~450ms) a profile square — or right-click → Color… — to open a
shadcn Popover of swatches and override its rail color, with Auto to fall
back to the deterministic hue. The hold timer rides alongside the dnd
pointer listener (a real drag cancels it, the trailing click is
suppressed), so reorder/select/recolor stay distinct gestures.
Overrides persist in localStorage ($profileColors), resolved via
resolveProfileColor (override wins, else the name-hashed hue). Cosmetic
and gated on the multi-profile rail, so single-profile users are
unaffected. Adds a reusable ui/popover.tsx (radix-ui umbrella).
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