feat(10-03): search, sort, filter, page and bulk-delete any list

- List state (search, sort, dir, page, per_page, filter[<name>]) lives in
  the URL query through parseListQuery/toListQuery; every change is a
  router replace and clears the selection; search is debounced 300 ms and
  resets the page
- DataTable renders the schema columns with a tri-state page checkbox,
  asc/desc/none sorting with aria-sort, selected rows, a sticky header,
  eight skeleton rows while loading and an empty slot
- CellValue renders text (muted dash when empty, arrays comma-joined),
  datetime as YYYY-MM-DD HH:mm and switch as the Tak/Nie pills
- The heading shows the plural recordCount and the create button;
  delete sits in the toolbar, disabled without a selection, and confirms
  with the plural deleteConfirm in a Reka alert dialog before POSTing
  bulk-delete; a 409 shows a danger toast
- FilterBar renders switch (JSON of the option value), daterange
  (from..to) and scope filters (choices from filters/{scope}/options)
- Pagination shows the range, the per-page select over perPageOptions
  (hidden with one choice) and a pager with ellipsis
- The tracer smoke test skips the new checkbox column; new backend::lang
  list keys; boardwalk/dist rebuilt

phrasebook/backend/lang/en/lang.yaml

@@ -44,6 +44,13 @@ list:
   select_row: Select row
   sort_ascending: Sort ascending
   sort_descending: Sort descending
+  search: Search
+  delete_failed: The selected records could not be deleted.
+  filters: Filters
+  filter_all: All
+  filter_from: From
+  filter_to: To
+  pagination: Pagination
 form:
   save: Save
   save_and_close: Save and close

phrasebook/backend/lang/pl/lang.yaml

@@ -48,6 +48,13 @@ list:
   select_row: Zaznacz wiersz
   sort_ascending: Sortuj rosnąco
   sort_descending: Sortuj malejąco
+  search: Szukaj
+  delete_failed: Nie udało się usunąć zaznaczonych rekordów.
+  filters: Filtry
+  filter_all: Wszystkie
+  filter_from: Od
+  filter_to: Do
+  pagination: Stronicowanie
 form:
   save: Zapisz
   save_and_close: Zapisz i zamknij