fix(assistant): a book page card draws the page after as the server's trial made it

The Studio drew the page after a held edit or cover change by running the
card's operations on its own book, which knows nothing of the journey's
photos, words and figures, so a caption from a photo, a text from an entry
or a map from the route came out differently or not at all. The card now
carries the page the server's trial made with the full context, read with
the book's schema and within the card's size, and the Studio draws it while
its book stands at the version the trial ran on. A book that moved on, a
card from before and a page too heavy to carry still run the operations on
the book on screen, the book the change will run on. The receipt leaves the
page out, since an applied change is drawn from the book itself.

server/tests/e2e/assistant-book-cards.e2e.test.ts

@@ -6,16 +6,16 @@
  *
  * Covered: a page edit that would leave empty frames goes back to the model
  * once, the same call made again is held with its page card (pages, the
- * operations, the findings), applied with a receipt card, and taken back in
- * one undo while nothing was saved since; an operation the engine refuses
- * never reaches the user; new pages are not taken back once the book moved on,
- * and neither is an edited page once that page was saved since (the restore
- * checks the page as the change left it). A save to another page does not
- * hold an edit's undo back, so of two changes to one page applied together
- * "undo all" takes back the newer, then the older; changes apply in the order
- * the decisions name them. A page is previewed with the ops of an edit before
- * it is proposed, nothing saved; on this text-only model the preview is the
- * page's description alone.
+ * operations, the findings, the page after as the trial made it), applied
+ * with a receipt card, and taken back in one undo while nothing was saved
+ * since; an operation the engine refuses never reaches the user; new pages
+ * are not taken back once the book moved on, and neither is an edited page
+ * once that page was saved since (the restore checks the page as the change
+ * left it). A save to another page does not hold an edit's undo back, so of
+ * two changes to one page applied together "undo all" takes back the newer,
+ * then the older; changes apply in the order the decisions name them. A page
+ * is previewed with the ops of an edit before it is proposed, nothing saved;
+ * on this text-only model the preview is the page's description alone.
  */
 import { buildApp } from '../../src/bootstrap';
 import { withRequestContext } from '../../src/nest/database/request-context';
@@ -240,6 +240,10 @@ describe('Studio book cards e2e', () => {
       code: 'empty_frame',
       severity: 'severe',
     });
+    // The page after rides on the card as the server's trial made it: the layout's two frames, both empty.
+    const trialPage = change?.data.card?.kind === 'bookPage' ? change.data.card.after : undefined;
+    expect(trialPage?.id).toBe(j.inner);
+    expect(trialPage?.elements.filter((element) => element.kind === 'photo')).toHaveLength(2);
     const threadId = ofType(turn, 'data-trek-thread')[0]?.data.threadId ?? 0;
 
     const decided = await approve(j.base, j.userId, threadId, held?.toolCallId ?? '');
@@ -248,6 +252,8 @@ describe('Studio book cards e2e', () => {
       toolCallId: held?.toolCallId,
       card: { kind: 'bookPage', baseVersion: 2, pages: [{ spreadId: j.inner }] },
     });
+    // Once applied the Studio draws the page as it is: the receipt carries no page of the trial.
+    expect(receipt?.data.card).not.toHaveProperty('after');
     // The pages the answer kept for the undo never reach the model or the chat.
     expect(JSON.stringify(ofType(decided, 'tool-output-available'))).not.toContain('previous_spreads');
     expect(JSON.stringify(ofType(decided, 'tool-output-available'))).not.toContain('page_digests');