votes: show votes when hovering over post score.

Make it so you can hover over a post's score to see the list of public
upvotes. Also show the upvote count, the downvote count, and the upvote
ratio.

test/functional/post_votes_controller_test.rb

@@ -10,8 +10,8 @@ class PostVotesControllerTest < ActionDispatch::IntegrationTest
     context "index action" do
       setup do
         @user = create(:user, enable_private_favorites: true)
-        create(:post_vote, user: @user, score: 1)
-        create(:post_vote, user: @user, score: -1)
+        @upvote = create(:post_vote, user: @user, score: 1)
+        @downvote = create(:post_vote, user: @user, score: -1)
       end
 
       should "render" do
@@ -19,6 +19,16 @@ class PostVotesControllerTest < ActionDispatch::IntegrationTest
         assert_response :success
       end
 
+      should "render for a compact view" do
+        get post_votes_path(variant: "compact")
+        assert_response :success
+      end
+
+      should "render for a tooltip" do
+        get post_votes_path(search: { post_id: @upvote.post_id }, variant: "tooltip")
+        assert_response :success
+      end
+
       context "as a user" do
         should "show the user all their own votes" do
           get_auth post_votes_path, @user