refactor(theme-studio): extract crHtml and mkStyleButtons table helpers

Three tables repeated two scaffolds. The contrast-cell readout (a WCAG ratio colored by its AA/AAA rating, plus the rating word) was copy-pasted at five sites; pulled the shared formatting into crHtml(r) and called it from the syntax, UI, and package cells (the picker readout renders differently and stays as is). The B/I/U/S style-button loop was duplicated near-verbatim in the UI and package tables; pulled it into mkStyleButtons(isOn, onToggle), which returns the button list so the caller still hands them to mkLockCell.

Left the syntax table's bold/italic buttons alone — two buttons, a different state model (the BOLD/ITALIC dicts), and an in-place refresh closure make it a poor fit for the same helper. Didn't introduce a shared row scaffold either; the three tables differ enough in columns and order that one would leak.

Behavior-preserving: the runtime-rendered tables are byte-identical to before (a DOM dump diff shows only the inline-script source changing, never a built tr/td/button/span). All hash gates, the node suite, and #locktest stay green.

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