Refactor: Implement smooth moderation queue

src/index.css

@@ -353,3 +353,42 @@ All colors MUST be HSL.
     border-color: hsl(var(--border));
   }
 }
+
+/* Smooth queue transitions */
+.queue-fade-enter {
+  animation: queueFadeIn 300ms ease-in-out;
+}
+
+.queue-fade-exit {
+  animation: queueFadeOut 200ms ease-in-out;
+}
+
+@keyframes queueFadeIn {
+  from {
+    opacity: 0;
+    transform: translateY(8px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@keyframes queueFadeOut {
+  from {
+    opacity: 1;
+    transform: translateY(0);
+  }
+  to {
+    opacity: 0;
+    transform: translateY(-8px);
+  }
+}
+
+/* Performance optimizations for queue items */
+.queue-item-container {
+  contain: layout style paint;
+  will-change: transform, opacity;
+  content-visibility: auto;
+  contain-intrinsic-size: 0 200px;
+}