feat(org-chart): add core cards and fixed-layout integration

examples/org-chart-react/index.css

@@ -0,0 +1,9 @@
+@import "@hm-design/ui/theme.css";
+
+/* Consumer content geometry; the chart owns its internal scroll container. */
+body { margin: 0; background: var(--hm-sem-bg-content); color: var(--hm-sem-fg-primary); font-family: var(--hm-font-family-base); }
+main { padding: 16px; }
+.consumer-charts { display: grid; gap: 24px; min-width: 0; }
+.consumer-charts > section { min-width: 0; }
+.consumer-chart { min-width: 0; max-width: 100%; }
+.consumer-note { margin: 0 0 16px; }