refactor(theme-studio): fold the box control into mkLineStyleControl

mkBoxControl duplicated the whole cluster/dropdown/paint/syncLocked machinery that mkLineStyleControl already provides for underline/strike/overline; it differed only in that its state object carries a width. I gave mkLineStyleControl an optional toState builder and reduced mkBoxControl to a wrapper that supplies it. The clear/reset tier functions already delegate their shared loop to clearUnlockedRows, so they were left as is. The buildTable/buildUITable/buildPkgTable skeleton merge is deferred: their shared control/expander/detail-editor/CSS machinery is now all extracted, and what remains is genuine per-tier column divergence that the browser gates pin by exact cell position.

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