Tooltips in the Notebooks chooser

From the development repository at e819bc4.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

client/js/browser_notebook.js

@@ -136,7 +136,8 @@ export const backend = {
   },
 
   async listPages(notebook) {
-    return transaction('readonly', async (pages) => (await pagesOf(pages, notebook)).map((page) => page.name));
+    return transaction('readonly', async (pages) =>
+      (await pagesOf(pages, notebook)).map((page) => ({ name: page.name, changed: page.changed })));
   },
 
   async readPage(notebook, pageName) {