Add aria-pressed to in comments votes component

In order to the users using screen readers know whether the button is pressed
or not.

app/components/comments/votes_component.html.erb

@@ -6,6 +6,7 @@
     <%= button_to vote_comment_path(comment, value: "yes"),
                   method: "post",
                   remote: can?(:vote, comment),
+                  "aria-pressed": pressed?("yes"),
                   title: t("votes.agree") do %>
       <span class="show-for-sr"><%= t("votes.agree") %></span>
     <% end %>
@@ -16,6 +17,7 @@
     <%= button_to vote_comment_path(comment, value: "no"),
                   method: "post",
                   remote: can?(:vote, comment),
+                  "aria-pressed": pressed?("no"),
                   title: t("votes.disagree") do %>
       <span class="show-for-sr"><%= t("votes.disagree") %></span>
     <% end %>

app/components/comments/votes_component.rb

@@ -1,8 +1,19 @@
 class Comments::VotesComponent < ApplicationComponent
   attr_reader :comment
-  delegate :can?, to: :helpers
+  delegate :can?, :current_user, to: :helpers
 
   def initialize(comment)
     @comment = comment
   end
+
+  def pressed?(value)
+    case current_user&.voted_as_when_voted_for(comment)
+    when true
+      value == "yes"
+    when false
+      value == "no"
+    else
+      false
+    end
+  end
 end