Initial commit: webtrees Family Navigator Graph sidebar module

SVG-based sidebar widget displaying immediate family relationships
(parents, siblings, spouses, children) with compact card layout,
multi-spouse routing, wrapped rows, and ancestor/descendant indicators.

resources/js/modules/lib/d3.js

@@ -0,0 +1,4 @@
+/**
+ * D3 re-exports used by the family navigator graph.
+ */
+export { select } from "d3-selection";