`.btn-link` was a dark-header utility (white text on translucent white)
reused on light surfaces — the RFC breadcrumb action bar, PR diff toggle,
modals, discussion panel — where it rendered white-on-white and looked
like missing buttons (reported: "Metadata"/"Claim ownership"/"Invitations"
absent on a super-draft header). Root-cause fix:
- Base .btn-link is now a light-surface secondary button (white fill,
hairline border, dark label); the dark-header "Sign out" keeps the
translucent-on-dark treatment via an .app-header .btn-link scope.
- .breadcrumb-actions normalizes the toggle, filled CTAs, and secondary
buttons to one height/radius/type as a single control group, and
flex-wraps instead of clipping off the right edge.
- Diff-mode active toggle now reads as clearly selected (filled ink).
CSS-only; patch release, plain frontend rebuild applies it. No upgrade
steps. Driver session 0059.0.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Ben Stull
76c82a5e96