feat(ui): add ContentTabs component (Exchanges | Dashboard | Runtime)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ui/src/components/ContentTabs.tsx

@@ -0,0 +1,26 @@
+import { SegmentedTabs } from '@cameleer/design-system';
+import type { TabKey } from '../hooks/useScope';
+import styles from './ContentTabs.module.css';
+
+const TABS = [
+  { label: 'Exchanges', value: 'exchanges' as const },
+  { label: 'Dashboard', value: 'dashboard' as const },
+  { label: 'Runtime', value: 'runtime' as const },
+];
+
+interface ContentTabsProps {
+  active: TabKey;
+  onChange: (tab: TabKey) => void;
+}
+
+export function ContentTabs({ active, onChange }: ContentTabsProps) {
+  return (
+    <div className={styles.wrapper}>
+      <SegmentedTabs
+        tabs={TABS}
+        active={active}
+        onChange={(v) => onChange(v as TabKey)}
+      />
+    </div>
+  );
+}