feat: render OneNote notebook hierarchy

src/App.test.tsx

@@ -169,6 +169,7 @@ describe('OneNoteApplication', () => {
       sourceSize: 1,
       entries: [],
       sections: [],
+      tree: { interpreted: false, nodes: [] },
       diagnostics: [],
     };
     render(
@@ -237,11 +238,36 @@ describe('OneNoteApplication', () => {
           ],
         },
       ],
+      tree: {
+        interpreted: true,
+        tocPath: 'Open Notebook.onetoc2',
+        nodes: [
+          {
+            kind: 'section-group',
+            id: 'Notes',
+            displayName: 'Notes',
+            children: [
+              {
+                kind: 'section',
+                id: 'readable',
+                sectionId: 'readable',
+                displayName: 'Readable',
+              },
+              {
+                kind: 'section',
+                id: 'broken',
+                sectionId: 'broken',
+                displayName: 'Broken',
+              },
+            ],
+          },
+        ],
+      },
       diagnostics: [
         {
           severity: 'warning',
-          code: 'TOC_NOT_INTERPRETED',
-          message: 'Package path order is temporary.',
+          code: 'TEST_PACKAGE_WARNING',
+          message: 'Example recoverable package warning.',
           recoverable: true,
         },
       ],
@@ -263,10 +289,12 @@ describe('OneNoteApplication', () => {
     expect(
       await screen.findByRole('heading', { name: 'Package summary' })
     ).toBeInTheDocument();
+    expect(screen.getByText('Notes')).toBeVisible();
+    expect(screen.getByText('OneNote notebook order')).toBeVisible();
     expect(
       screen.getByRole('button', { name: /Broken, failed/i })
     ).toBeVisible();
-    expect(screen.getByText('TOC_NOT_INTERPRETED')).toBeInTheDocument();
+    expect(screen.getByText('TEST_PACKAGE_WARNING')).toBeInTheDocument();
     expect(
       await within(
         screen.getByRole('article', { name: 'First meeting' })