Add display frames and improve create-page page management.

Store phone/tablet/photo-frame shells with catalogs, append pages from extra images or PDFs, and reorder drafts with drag-and-drop.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/server/catalog-repo.test.ts

@@ -31,6 +31,7 @@ describe("catalog repo", () => {
     const found = repo.getById("abc12xyz90");
     expect(found).toEqual(created);
     expect(found?.flipMs).toBe(1000);
+    expect(found?.frame).toBe("none");
     expect(found?.deleteToken).toBe("token-token-token-token-12");
   });