feat(theme-studio): reflow the B/I/U/S style buttons into a 2x2 cluster

The four style buttons sat in a horizontal row, the widest part of the style column. I wrapped them in the same 2x2 grid the box control uses, so they form a square (still multi-toggle, since bold and italic combine). The column narrows to roughly half its width across all three tiers.

A #styletest gate confirms the four buttons live in a .stylecluster.

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