Highlight new articles with animated badges and update UI elements

Fetch all articles to count them per media outlet and display a "NEW" badge with a subtle animation on cards with new content.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 0fb68265-c270-4198-9584-3d9be9bddb41
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/0fb68265-c270-4198-9584-3d9be9bddb41/hntn6cC

client/src/index.css

@@ -123,6 +123,25 @@
   .card-hover {
     transition: all 0.2s ease-in-out;
   }
+
+  @keyframes float {
+    0%, 100% {
+      transform: translateY(0px);
+    }
+    50% {
+      transform: translateY(-8px);
+    }
+  }
+
+  .animate-float {
+    animation: float 3s ease-in-out infinite;
+  }
+
+  @media (prefers-reduced-motion: reduce) {
+    .animate-float {
+      animation: none;
+    }
+  }
   
   .card-hover:hover {
     transform: translateY(-2px);