feat(theme-studio): custom weight/slant dropdowns with previews

Replace the native weight and slant selects with a custom dropdown themed like the color dropdown. The values are spelled out (semibold instead of "semi", and an unset control reads "weight"/"slant" rather than "wt"/"sl"), and each popup option renders in its own weight or slant so the choice previews itself. The trigger shows the current value in that style too.

mkEnumDropdown mirrors the color dropdown's popup, lock, and outside-click handling, so the new control opens, locks, and closes the same way. The style-cluster gates drive the popup instead of a native select and check the spelled-out range plus the per-option preview.

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