Everyone has the Notebooks chooser

From the development repository at 1ccf212.

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

client/js/chooser.js

@@ -15,6 +15,10 @@
  * a Trash the entries are moved there, and the button says so;
  * in the browser they are gone for good, and the button says that.  The
  * notebook being written in cannot be marked: its mark explains.
+ * Everyone has the chooser (Andy, 2026-10-11), so that a guest can see
+ * and clear what their notebook holds, in a browser above all; loading
+ * a page into the session is for the host and co-hosts, and a card says
+ * so to anyone else.
  */
 
 import { discardNotebook, discardPage, listKeptPages, listNotebooks, readPage } from './notebook.js';
@@ -75,6 +79,8 @@ export class NotebookChooser {
     this.notebook = '';
     /** The notebook being written in, which cannot be deleted while it is. */
     this.writing = '';
+    /** Whether this participant may load a page into the session. */
+    this.mayLoad = true;
     /** Whether deletions go to a Trash (the local program's) or are for good. */
     this.trash = false;
     /** Counts openings, so that pictures fetched for an earlier one are dropped. */
@@ -99,10 +105,12 @@ export class NotebookChooser {
   /**
    * Show the notebooks, or the pages of the only notebook.
    * @param {string} [notebook]  Open on this notebook: the one being written in.
+   * @param {boolean} [mayLoad]  Whether a page may be loaded into the session.
    */
-  async open(notebook) {
+  async open(notebook, mayLoad = true) {
     this.opening += 1;
     this.writing = notebook ?? '';
+    this.mayLoad = mayLoad;
     this.clearMarks();
     this.dialog.showModal();
     element('chooser_message').textContent = '';
@@ -190,6 +198,10 @@ export class NotebookChooser {
       title.textContent = pageTitle(pageName);
       card.append(picture, title);
       card.addEventListener('click', async () => {
+        if (!this.mayLoad) {
+          this.say('Only the host and co-hosts can start a page for everyone from a kept page.');
+          return;
+        }
         const text = await readPage(notebook, pageName);
         if (text === null) return;
         this.dialog.close();