feat(theme-studio): flag gone color assignments with a border

An assignment pointing at a color no longer in the palette showed only as "(gone)" on hover. I added a distinct solid border to the swatch whenever its current value resolves to "(gone)", so a broken assignment reads at a glance. The solid red outline is set apart from the dashed unused-tile flag, keeping the two palette-state cues distinguishable. A #gonetest gate covers the flagged and unflagged cases.

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