fix(theme-selector): stop accidental duplicate colors when editing a value

Editing a color's value could create a new color instead of updating it. Enter in the hex or name field now applies to the selected color rather than adding, and Add color refuses a name that already exists with a noticeable inline notice, so re-saving an existing color can't silently spawn a duplicate. Picking from the native swatch focuses the hex field so Enter applies right after, and both add and update report what happened in the same notice line.

0 files changed, 0 insertions, 0 deletions