chore: import upstream snapshot with attribution

apps/sim/lib/pptx-renderer/model/nodes/chart-node.ts

@@ -0,0 +1,55 @@
+/**
+ * Chart node — represents a chart embedded in a graphicFrame element.
+ */
+
+import { type RelEntry, resolveRelTarget } from '../../parser/rel-parser'
+import type { SafeXmlNode } from '../../parser/xml-parser'
+import { type BaseNodeData, parseBaseProps } from './base-node'
+
+export interface ChartNodeData extends BaseNodeData {
+  nodeType: 'chart'
+  chartPath: string // e.g. "ppt/charts/chart1.xml"
+}
+
+/**
+ * Parse a graphicFrame containing a chart reference into a ChartNodeData.
+ *
+ * @param graphicFrame  The graphicFrame XML node
+ * @param slideRels     Relationship entries for the containing slide
+ * @param slidePath     Full path of the slide (e.g. "ppt/slides/slide1.xml")
+ */
+export function parseChartNode(
+  graphicFrame: SafeXmlNode,
+  slideRels: Map<string, RelEntry>,
+  slidePath: string
+): ChartNodeData | undefined {
+  const base = parseBaseProps(graphicFrame)
+
+  // Find chart relationship
+  const graphic = graphicFrame.child('graphic')
+  const graphicData = graphic.child('graphicData')
+
+  // Find the chart reference - look for c:chart element with r:id
+  let chartRId: string | undefined
+  for (const child of graphicData.allChildren()) {
+    if (child.localName === 'chart') {
+      chartRId = child.attr('r:id') || child.attr('id')
+      break
+    }
+  }
+
+  if (!chartRId) return undefined
+
+  const rel = slideRels.get(chartRId)
+  if (!rel) return undefined
+
+  // Resolve chart path relative to slide
+  const slideDir = slidePath.substring(0, slidePath.lastIndexOf('/'))
+  const chartPath = resolveRelTarget(slideDir, rel.target)
+
+  return {
+    ...base,
+    nodeType: 'chart' as const,
+    chartPath,
+  }
+}