Every x-btn variant now carries a persistent border + background. Replace the
borderless `ghost`/`ghost-danger` (the latter only reddened on hover) with the
bordered `secondary` and a new `danger-soft` (red-tinted border+bg, always).
Migrate all 10 usages across servers/settings/files.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
boban