Change wording on cutoff banner

This improves the content in this banner for clarity

Jira-Issue: MAV-5301

Author: alistair-white-horne-tng

app/views/immunisation_imports/new.html.erb

@@ -7,12 +7,16 @@
 <% content_for :page_title, title %>
 
 <% if (cutoff_date = current_team.national_reporting_cut_off_date) && cutoff_date.today? %>
-  <%= govuk_notification_banner(title_text: "#{cutoff_date.to_fs(:long)} - Check where to upload records") do |notification_banner| %>
-    <% notification_banner.with_heading(text: "Vaccinations given:") %>
-    <ul>
-      <li>before <%= cutoff_date.to_fs(:long) %> must be uploaded to NIVS by the end of today</li>
-      <li>on or after <%= cutoff_date.to_fs(:long) %> must be uploaded to Mavis national reporting only</li>
-    </ul>
+  <%= govuk_notification_banner(title_text: "Important") do %>
+    <h3 class="nhsuk-notification-banner__heading">
+      Mavis national reporting replaces NIVS on <%= cutoff_date.to_fs(:long) %>
+    </h3>
+
+    <h4 class="nhsuk-u-margin-bottom-2">Vaccinations given before <%= cutoff_date.to_fs(:long) %></h4>
+    <p>Upload to NIVS by <%= cutoff_date.to_fs(:long) %>. After this, NIVS will no longer be available.</p>
+
+    <h4 class="nhsuk-u-margin-bottom-2">Vaccinations given on or after <%= cutoff_date.to_fs(:long) %></h4>
+    <p>Upload to Mavis national reporting only.</p>
   <% end %>
 <% end %>
 

spec/features/import_vaccination_records_national_reporting_spec.rb

@@ -79,14 +79,17 @@
         given_i_am_signed_in_as_a_national_reporting_user
         when_i_navigate_to_the_upload_page
         expect(page).to have_css(".nhsuk-notification-banner")
-        expect(page).to have_content("20 April 2026")
-        expect(page).to have_content("Check where to upload records")
         expect(page).to have_content(
-          "before 20 April 2026 must be uploaded to NIVS by the end of today"
+          "Mavis national reporting replaces NIVS on 20 April 2026"
         )
+        expect(page).to have_content("Vaccinations given before 20 April 2026")
         expect(page).to have_content(
-          "on or after 20 April 2026 must be uploaded to Mavis national reporting only"
+          "Upload to NIVS by 20 April 2026. After this, NIVS will no longer be available."
         )
+        expect(page).to have_content(
+          "Vaccinations given on or after 20 April 2026"
+        )
+        expect(page).to have_content("Upload to Mavis national reporting only.")
       end
     end
   end