feat: render OneNote notebook hierarchy

src/onenote/onepkg/package.ts

@@ -8,6 +8,7 @@ import type { ParserDiagnostic } from '../model/diagnostics.js';
 import { checkCancellation } from './cancellation.js';
 import { extractCabinet } from './cabinet.js';
 import { diagnosticFromUnknown, OnePkgError, warning } from './errors.js';
+import { buildOneNotePackageTree } from './toc-hierarchy.js';
 import type {
   CabOpenOptions,
   ExtractedCabFile,
@@ -162,6 +163,12 @@ export async function openOneNotePackage(
     });
   }
 
+  const treeResult = buildOneNotePackageTree(
+    extraction.extractedEntries,
+    packagedSections
+  );
+  diagnostics.push(...treeResult.diagnostics);
+
   return {
     package: {
       format: 'onepkg',
@@ -169,6 +176,7 @@ export async function openOneNotePackage(
       sourceSize: bytes.byteLength,
       entries: packageEntries,
       sections: packagedSections,
+      tree: treeResult.tree,
       diagnostics,
     },
     extractedEntries: extraction.extractedEntries,