This changes how initial searches can be handled via config rather than
specific action so they can be considered in how the initial data load
is done, to prevent the default empty state loading and overwriting the
search data if it lands later (which was commonly likely).
For #4778
- Adapted existing page picker to be usable elsewhere.
- Added endpoint for getting templates for entity picker.
- Added search template filter to support above.
- Updated book save handling to check/validate submitted template.
- Allows non-visible pages to flow through the save process, if not
being changed.
- Updated page deletes to handle removal of default usage on books.
- Tweaked wording and form styles to suit.
- Updated migration to explicity reflect default value.
- Removed having sort items in tabbing order since they have no action.
- Updated "show other books" list to add upon single selection since it
was not clear how these were added (double press) without then seeing
the add button, and even then the add button would be after the scroll
list.
