feat(theme-selector): edit palette colors in place, taller mock frame

I made palette colors editable. Click a chip and its hex and name load into the editor and the chip is selected. "Update selected" rewrites that entry and remaps every syntax and ui assignment from the old hex to the new, so nudging a color no longer means redoing the assignments that used it. "Add color" still appends a fresh one.

The ui-faces mock frame now stretches to the height of its face table, with the buffer filling and the mode-line pinned to the bottom like a real window. I also renamed "interface faces" to "ui faces."

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