refactor(theme-studio): unify color dropdowns on the swatch picker

The UI and package tables used a native <select> for fg/bg, while the syntax table used the swatch-div dropdown (mkColorDropdown). The native select rendered its option swatch colors unreliably on Linux Chrome — the reason the swatch div exists. Routed all three tiers through mkColorDropdown and deleted colorDropdown, so every color picker now shows real swatches. The inherit column stays a select; it picks a face name, not a color.

Pulled the option-list construction into a shared ddList helper (default entry, palette, plus a "(gone)" entry when the current color left the palette) — the syntax table built that inline, the other tiers now reuse it. To keep fg/bg columns sorting by color value rather than by displayed name, the swatch dropdown exposes its value as data-val and cellVal reads it. Updated #locktest's UI assertion to the div lock mechanism (data-locked) since the UI control is no longer a select.

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