feat(FN-3472): expand org chart regression test assertions

The merge adds expanded regression assertions for the org chart feature, covering agent CSS classes and mobile agents view components. The tests verify styling and layout behavior across both desktop and mobile contexts.

Fusion-Task-Id: FN-3472

packages/dashboard/app/components/agentsOrgChartLayout.ts

@@ -0,0 +1,48 @@
+import type { OrgTreeNode } from "../api";
+
+export type OrgChartLayoutMode = "horizontal" | "vertical";
+
+export interface OrgChartLayoutInput {
+  tree: OrgTreeNode[];
+  availableWidth: number;
+}
+
+const DEFAULT_NODE_WIDTH = 220;
+const DEFAULT_SIBLING_GAP = 24;
+const DEFAULT_ROOT_GAP = 24;
+const DEFAULT_CHART_PADDING = 16;
+
+function getLeafCount(node: OrgTreeNode): number {
+  if (node.children.length === 0) {
+    return 1;
+  }
+  return node.children.reduce((sum, child) => sum + getLeafCount(child), 0);
+}
+
+function estimateSubtreeWidth(node: OrgTreeNode): number {
+  const leaves = getLeafCount(node);
+  return leaves * DEFAULT_NODE_WIDTH + Math.max(0, leaves - 1) * DEFAULT_SIBLING_GAP;
+}
+
+export function estimateOrgChartWidth(tree: OrgTreeNode[]): number {
+  if (tree.length === 0) {
+    return DEFAULT_NODE_WIDTH;
+  }
+  const rootWidths = tree.map(estimateSubtreeWidth);
+  const totalRootsWidth = rootWidths.reduce((sum, width) => sum + width, 0);
+  const rootGapWidth = Math.max(0, tree.length - 1) * DEFAULT_ROOT_GAP;
+  return totalRootsWidth + rootGapWidth + DEFAULT_CHART_PADDING * 2;
+}
+
+export function resolveOrgChartLayoutMode(input: OrgChartLayoutInput): OrgChartLayoutMode {
+  const safeAvailableWidth = Number.isFinite(input.availableWidth) && input.availableWidth > 0
+    ? input.availableWidth
+    : 0;
+
+  if (safeAvailableWidth === 0 || input.tree.length <= 1) {
+    return "horizontal";
+  }
+
+  const estimatedWidth = estimateOrgChartWidth(input.tree);
+  return estimatedWidth > safeAvailableWidth ? "vertical" : "horizontal";
+}