feat: render OneNote notebook hierarchy

src/onenote/onepkg/toc-hierarchy.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from 'vitest';
+
+import { resolveTocChildPath } from './toc-hierarchy.js';
+
+describe('ONEPKG TOC child paths', () => {
+  it('joins a single NFC-normalized child name within its section group', () => {
+    expect(resolveTocChildPath('Projects', 'Cafe\u0301.one')).toBe(
+      'Projects/Café.one'
+    );
+  });
+
+  it.each(['../Secret.one', '..', 'nested/Secret.one', 'C:\\Secret.one'])(
+    'rejects unsafe FolderChildFilename %s',
+    (filename) => {
+      expect(() => resolveTocChildPath('Projects', filename)).toThrow(
+        /Unsafe FolderChildFilename/u
+      );
+    }
+  );
+});