refactor(a11y): 44×44 touch targets + normalize accent-bg alpha

ordinis-admin-ui/src/components/layout/Sidebar.tsx

@@ -317,7 +317,8 @@ function SidebarFooter({
           <button
             type="button"
             onClick={() => i18n.changeLanguage(next)}
-            className="h-7 px-2.5 rounded-md border border-line bg-surface text-cap text-ink-2 hover:bg-surface-2 hover:text-ink transition-colors"
+            // h-11 + min-w-11 — DESIGN.md §13 touch target enforcement.
+            className="h-11 min-w-11 px-2.5 rounded-md border border-line bg-surface text-cap text-ink-2 hover:bg-surface-2 hover:text-ink transition-colors inline-flex items-center justify-center"
             aria-label={`Language: ${cur.toUpperCase()}, click to switch`}
           >
             {cur.toUpperCase()}
@@ -398,7 +399,8 @@ function AuthedUserBlock({
           onClick={() => auth.signoutRedirect().catch(() => auth.removeUser())}
           title={t('auth.logout', { defaultValue: 'Logout' })}
           aria-label={t('auth.logout', { defaultValue: 'Logout' })}
-          className="size-7 rounded-md text-mute hover:text-ink hover:bg-surface-2 inline-flex items-center justify-center transition-colors shrink-0"
+          // size-11 = 44×44 WCAG AAA per DESIGN.md §13.
+          className="size-11 rounded-md text-mute hover:text-ink hover:bg-surface-2 inline-flex items-center justify-center transition-colors shrink-0"
         >
           <span aria-hidden>⎋</span>
         </button>