feat(12.1-02): read-only preview screen with a status hint and record actions

- config_form.yaml preview block (optional headerPartial), reported in the form schema as preview
- fields with context: preview show only on the preview screen and are never written
- form messages preview and edit; recordActions without a preview block stops boot
- SPA route {id}/preview, PreviewView and PreviewField, record actions in the footer
- mapWinterUrl maps preview/:id; the update form returns to the preview
- summer-callout partial style classes for status hints
- README, docs, OpenAPI document, TS types and the embedded build updated

modules/phrasebook/backend/lang/pl/lang.yaml

@@ -73,6 +73,7 @@ form:
   update: Edytuj
   create: Utwórz
   return_to_list: Wróć do listy
+  return_to_preview: Wróć do podglądu
   close: Zamknij
   confirm: Potwierdź
   saving: Zapisywanie…
@@ -199,6 +200,8 @@ messages:
     saved: Zapisano
     delete_confirm: Usunąć ten rekord?
     deleted: Usunięto rekord
+    preview: Podgląd rekordu
+    edit: Edytuj rekord
   relation:
     link: Dodaj
     link_hint: Wybierz rekordy, które chcesz dołączyć.