feat(dashboard): add visual feedback for spawned agents

dashboard/styles.css

@@ -153,6 +153,16 @@ body {
   animation: modalPanelOut 200ms ease-in forwards;
 }
 
+/* Spawn highlight animation - visual feedback when a newly spawned agent appears */
+@keyframes spawn-highlight {
+  0% { box-shadow: 0 0 0 3px rgba(95, 208, 164, 0.6), 0 0 16px rgba(95, 208, 164, 0.15); }
+  100% { box-shadow: 0 0 0 0 transparent, 0 0 0 transparent; }
+}
+
+.session-card-spawned {
+  animation: spawn-highlight 2.5s ease-out;
+}
+
 /* Accessibility: disable continuous animations for motion-sensitive users */
 @media (prefers-reduced-motion: reduce) {
   .spinner-dot::after {
@@ -171,7 +181,8 @@ body {
     animation: none;
   }
   .animate-float,
-  .animate-fade-in-up {
+  .animate-fade-in-up,
+  .session-card-spawned {
     animation: none !important;
   }
 }