fix: campaign cards equal height — h-full + flex col to fill grid row

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/campaigns/campaign-card.tsx

@@ -57,7 +57,7 @@ export const CampaignCard = ({ campaign, ads, leads }: CampaignCardProps) => {
     return (
         <div
             className={cx(
-                'rounded-2xl border border-secondary bg-primary overflow-hidden transition hover:shadow-lg cursor-pointer',
+                'flex flex-col rounded-2xl border border-secondary bg-primary overflow-hidden transition hover:shadow-lg cursor-pointer h-full',
                 isPaused && 'opacity-60',
             )}
         >