Fix consent period copy on the day consent closes

This fixes a bug where the session overview was showing consent as
already closed on the day before the last session date, even though
parents could still submit consent until midnight.

Jira-Issue: MAV-6547

Author: jhenderson

app/helpers/sessions_helper.rb

@@ -9,6 +9,8 @@ def session_consent_period(session)
       "Not provided"
     elsif open_at.future?
       "Opens #{open_at.to_fs(:short)}"
+    elsif close_at.today?
+      "Closes today at midnight"
     elsif close_at.future?
       "Open from #{open_at.to_fs(:short)} until #{close_at.to_fs(:short)}"
     else

spec/helpers/sessions_helper_spec.rb

@@ -23,6 +23,12 @@
       it { should eq("Open from 23 September until 13 October") }
     end
 
+    context "when the consent period closes today" do
+      let(:date) { Date.new(2024, 10, 2) }
+
+      it { should eq("Closes today at midnight") }
+    end
+
     context "when in the far future" do
       let(:date) { Date.new(2025, 1, 1) }