feat: improve topology view

public/styles/main.css

@@ -2925,6 +2925,34 @@ p {
     .details-drawer-backdrop { display: none; }
 }
 
+/* Topology hover tooltip for labels */
+.topology-tooltip {
+    position: fixed;
+    z-index: 1001;
+    pointer-events: none;
+    background: var(--bg-primary);
+    border: 1px solid var(--border-primary);
+    box-shadow: var(--shadow-secondary);
+    border-radius: 10px;
+    padding: 0.5rem 0.6rem;
+    opacity: 0;
+    transform: translateY(4px);
+    transition: opacity 0.12s ease, transform 0.12s ease;
+}
+.topology-tooltip.visible {
+    opacity: 1;
+    transform: translateY(0);
+}
+.topology-tooltip .member-labels {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.35rem;
+}
+.topology-tooltip .label-chip {
+    font-size: 0.72rem;
+    padding: 0.2rem 0.5rem;
+}
+
 /* Labels section styling in node details */
 .detail-section {
     margin-top: 20px;