a11y(achievements): lift the dashboard "View all" link to a 44 px tap target

The `RecentAchievementsCard` "View all" link in the dashboard card
header was 46×16 px. The mobile-viewport e2e check fails at the
WCAG-recommended ≥44 px touch-target floor and the existing project
contract pins the same number. `inline-flex min-h-11 items-center`
keeps the visual styling identical while satisfying the floor.

src/components/gamification/recent-achievements-card.tsx

@@ -99,7 +99,7 @@ export function RecentAchievementsCard() {
         </div>
         <Link
           href="/achievements"
-          className="text-primary hover:text-primary/80 text-xs font-medium underline-offset-4 hover:underline"
+          className="text-primary hover:text-primary/80 inline-flex min-h-11 items-center text-xs font-medium underline-offset-4 hover:underline"
         >
           {t("achievements.dashboardCard.viewAll")}
         </Link>