pagination: fix paginator regression caused by Rails 7.

Fix the paginator not detecting the first or last page correctly during
sequential pagination.

Caused by the fact that we fetch one more record than needed to detect
whether we're on the last page, then throw that record away by
overriding Rails' internal `records` method. An upstream refactoring
meant that the `size` method now counts the number of records *after*
the extra record is thrown away, where before it counted *before* the
extra record was thrown away.

app/logical/pagination_extension.rb

@@ -82,7 +82,8 @@ module PaginationExtension
     when :sequential_before
       false
     when :sequential_after
-      size <= records_per_page
+      load
+      @records.size <= records_per_page
     end
   end
 
@@ -91,7 +92,8 @@ module PaginationExtension
     when :numbered
       current_page >= total_pages
     when :sequential_before
-      size <= records_per_page
+      load
+      @records.size <= records_per_page
     when :sequential_after
       false
     end