Replace raw <button> elements with Button variant="ghost" in stat-block panel, toast, player modals. Add icon-sm size variant (h-6 w-6) for compact contexts. Consolidate text button sizes into a single default (h-8 px-3), removing the redundant sm variant. Add size prop to ConfirmButton for consistent sizing. Button now has three sizes: default (text), icon, icon-sm. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>