feat(theme-selector): category-flash, full-height mock, contrast-limit masking

I made three preview and picker fixes. Clicking a category name in the code/color assignments table now flashes the matching tokens in the code sample, the reverse of clicking a token to flash its row, and falls back to flashing the example cell when the language has no token of that category. The live buffer preview now syncs its height to the ui-faces table so the two end together. The picker gains an any / AA+ / AAA limit: the saturation-value square masks the region that fails the chosen contrast against the background, and the reuse chips dim the colors that don't pass, so it's hard to land on an illegible color.

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