feat(theme-selector): click a preview token to flash its assignment row

I added the reverse lookup. Clicking a token in the code sample flashes the matching code/color assignment row and scrolls it into view; clicking an element in the mock frame flashes its ui-faces row, or the assignment row when it's a code token. Each token carries its category and each mock element its face as a data attribute, so the lookup survives sorting, reassignment, and palette edits.

Going color-first can't tell you which category owns a shared color, since operator, function, and punctuation all read as silver. Clicking the token answers it directly.

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