feat: add shared admin UI components (StatusBadge, RefreshableCard, ConfirmDeleteDialog)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/admin/StatusBadge.tsx

@@ -0,0 +1,17 @@
+import styles from './StatusBadge.module.css';
+
+export type Status = 'healthy' | 'warning' | 'critical' | 'unknown';
+
+interface StatusBadgeProps {
+  status: Status;
+  label?: string;
+}
+
+export function StatusBadge({ status, label }: StatusBadgeProps) {
+  return (
+    <span className={styles.badge}>
+      <span className={`${styles.dot} ${styles[status]}`} />
+      {label && <span className={styles.label}>{label}</span>}
+    </span>
+  );
+}