feat(theme-studio): surface the five remaining font-lock faces

Add the font-lock faces the syntax tier didn't cover (warning, doc-markup, negation-char, and the two regexp-grouping faces) as their own editable categories: warn, dmark, neg, rxgb, rxgc. Each maps 1:1 to its face, seeds from the stock defaults, and is exercised in the code-sample preview via a TODO comment, a docstring substitution, a string regexp, and a C negation.

Injected only the five new faces into the default-faces snapshot rather than regenerating it wholesale. A full recapture pulls in unrelated package-inventory drift.

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