fix: remove CSS scale animation causing unmapped halos to dance

public/css/style.css

@@ -457,7 +457,7 @@ body {
 /* Device node hover & selection */
 .svg-device {
   cursor: pointer;
-  transition: transform 0.15s ease, filter 0.15s ease;
+  transition: filter 0.15s ease;
 }
 
 .svg-device:hover {
@@ -473,14 +473,8 @@ body {
 }
 
 .svg-unmapped-halo {
-  animation: pulse-ring 2s infinite;
   pointer-events: none;
-}
-
-@keyframes pulse-ring {
-  0% { opacity: 0.8; transform: scale(1); }
-  50% { opacity: 0.3; transform: scale(1.3); }
-  100% { opacity: 0.8; transform: scale(1); }
+  opacity: 0.7;
 }
 
 .svg-breaker-badge {