refactor(tabs): centralize tab wiring in base Component.setupTabs with onChange hook; persist and restore NodeDetails active tab; reuse base tabs in ClusterMembersComponent

public/scripts/framework.js

@@ -570,7 +570,8 @@ class Component {
     }
 
     // Tab helpers
-    setupTabs(container = this.container) {
+    setupTabs(container = this.container, options = {}) {
+        const { onChange } = options;
         const tabButtons = container.querySelectorAll('.tab-button');
         const tabContents = container.querySelectorAll('.tab-content');
         tabButtons.forEach(button => {
@@ -578,6 +579,9 @@ class Component {
                 e.stopPropagation();
                 const targetTab = button.dataset.tab;
                 this.setActiveTab(targetTab, container);
+                if (typeof onChange === 'function') {
+                    try { onChange(targetTab); } catch (_) {}
+                }
             });
         });
         tabContents.forEach(content => {