feat(charts): manage investigation charts in a scrolling workspace

src/features/workbench/utils/presentation-chart-blocks.ts

@@ -0,0 +1,23 @@
+import type { AnswerUiBlock } from "@/features/agent";
+
+/** Include only reachable Chart nodes, preserving report props and their source. */
+export function presentationChartBlocks(blocks: AnswerUiBlock[]): AnswerUiBlock[] {
+  return blocks.flatMap((block) => {
+    const charts: AnswerUiBlock[] = [];
+    const visited = new Set<string>();
+    const visit = (id: string) => {
+      if (visited.has(id)) return;
+      visited.add(id);
+      const element = block.spec.elements[id];
+      if (!element) return;
+      if (element.type === "Chart") charts.push({
+        ...block,
+        block_id: `${block.block_id}:${id}`,
+        spec: { root: id, elements: { [id]: element } }
+      });
+      else element.children?.forEach(visit);
+    };
+    visit(block.spec.root);
+    return charts;
+  });
+}