feat: render OneNote notebook hierarchy

src/onenote/parser/parse-toc.ts

@@ -103,7 +103,7 @@ export function parseOneNoteTableOfContents(
   return {
     sourceName: options.sourceName ?? 'Open Notebook.onetoc2',
     fileIdentity: store.fileIdentity,
-    color: optionalU32(root, TOC_PROPERTY.color),
+    color: optionalColor(root),
     enableHistory: optionalBool(root, TOC_PROPERTY.enableHistory),
     entries,
     diagnostics,
@@ -151,7 +151,7 @@ function parseChildren(
             filename: decodeFolderChildFilename(filename),
             fileIdentity: requiredGuid(child, TOC_PROPERTY.fileIdentity),
             orderingId: requiredU32(child, TOC_PROPERTY.orderingId),
-            color: optionalU32(child, TOC_PROPERTY.color),
+            color: optionalColor(child),
           });
         } else {
           result.push(...parseChildren(context, child, depth + 1));
@@ -293,6 +293,11 @@ function optionalU32(
   return value.value;
 }
 
+function optionalColor(object: StoreObject): number | undefined {
+  const color = optionalU32(object, TOC_PROPERTY.color);
+  return color === 0xffff_ffff ? undefined : color;
+}
+
 function optionalBool(
   object: StoreObject,
   propertyId: number