feat(theme-studio): show view-area > element usages on palette tile hover

I added paletteUsages, which enumerates every place a color is assigned, grouped by view area (the view dropdown's names: color/code assignments, ui faces, each package app) and the element within it. renderPalette builds the per-area scopes once and appends the list to each used tile's hover title, under the existing name/hex/nearest-deltaE line. Node tests and a #usagetest gate cover it.

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