feat(theme-studio): re-bind "(gone)" assignments when a name returns

Deleting a palette color leaves any assignment pointing at it showing "(gone)". Recreating a color with the same deleted name now re-points those stranded assignments to the new color, even when its hex differs, instead of leaving them stuck on the old hex forever.

Delete records the removed name and hex; the next add of that name re-points every reference (syntax map, UI faces, package faces) to the new hex and consumes the record. The registry clears on import so a stale name from a previous theme can't re-bind across a load. I pulled the re-point loop that update-selected already used into a shared helper. A #healtest gate covers delete-then-recreate-with-a-new-hex.

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