Raise loaded documents to the schema their blocks need, and bring the old browser checks back

The kant-it.de header used the hamburger switch at schema 19, so the server refused its
preview and save; the editor now raises a loaded document to the version its blocks and
properties require. The admin, button and navigation checks select blocks through the
structure tab, find the motion button by id and expect what the site's motion setting says.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/navigation-ux-check.mjs

@@ -34,7 +34,10 @@ try {
   data.document.blocks.push({ id: 'qa-anchor', type: 'section', children: [{ id: 'qa-anchor-title', type: 'heading', props: { text: 'Kontaktbereich', level: 2 } }] });
   assert.equal((await context.request.post(api + '/draft', { headers: { 'X-CSRF-Token': data.csrfToken }, data: { document: data.document, expectedVersion: data.version } })).status(), 200);
   await page.goto(`${origin}/admin/pages/${fixture.homeId}`);
+  // Im Reiter „Struktur“ wählen und mit „Bearbeiten“ öffnen, wie im Editor selbst.
+  await page.getByRole('tab', { name: 'Struktur', exact: true }).click();
   await page.locator('#structure [data-block-id="qa-anchor"]').click();
+  await page.locator('#structure [data-edit-block="qa-anchor"]').click();
   await page.locator('#property-anchor').fill('#kontakt-check'); await page.locator('#property-anchor').blur();
   await page.locator('#save').click(); await page.locator('#save-status').filter({ hasText: 'Entwurf gespeichert' }).waitFor();
   await page.locator('#publish').click(); await page.locator('#confirm-publish').click(); await page.locator('#save-status').filter({ hasText: 'Veröffentlicht' }).waitFor();