admin-btn-danger was referenced but never defined, so the 'Opravdu smazat' confirm rendered as a plain button. Define a solid danger button (uses --danger), matching the primary button's structure; the per-row delete trigger stays an outline via plan.css. (Includes the transparent-border button refinement so variants don't layout-shift.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>