add aria-current for view-type buttons

app/components/blacklight/response/view_type_button_component.html.erb

@@ -1,4 +1,4 @@
-<%= link_to url, title: label, class: "#{Array(@classes).join(' ')} view-type-#{ @key.to_s.parameterize } #{"active" if selected?}" do %>
+<%= link_to url, title: label, aria: aria_attributes, class: "#{Array(@classes).join(' ')} view-type-#{ @key.to_s.parameterize } #{"active" if selected?}" do %>
   <%= icon %>
   <span class="caption"><%= label %></span>
 <% end %>

app/components/blacklight/response/view_type_button_component.rb

@@ -25,6 +25,12 @@ def label
         @view.display_label
       end
 
+      def aria_attributes
+        return unless selected?
+
+        { current: true }
+      end
+
       def url
         helpers.url_for(@search_state.to_h.merge(view: @key))
       end