Fix: service manual mobile/tablet alignment

- Removed "govuk-width-container" divs from service_manual_topic and application.html.erb as they were causing alignment issues on mobile and tablet views. This adjustment ensures that content sections are displayed correctly across different devices.

- Improved the service manual_phase_label test to handle case sensitivity for "Alpha". Updated the test to ensure Capybara correctly identifies the phase label regardless of case, resolving the previous error.

app/views/content_items/service_manual_topic.html.erb

@@ -4,7 +4,6 @@
 <% content_for :phase_message do %>
   <%= render 'shared/custom_phase_message', phase: @content_item.phase %>
 <% end %>
-<div class="govuk-width-container">
 
   <%= render "govuk_publishing_components/components/breadcrumbs", {
     breadcrumbs: @content_item.breadcrumbs,
@@ -89,4 +88,3 @@
     </div>
 
   </div>
-</div>

app/views/layouts/application.html.erb

@@ -10,9 +10,7 @@
       <%= render 'govuk_publishing_components/components/phase_banner', phase: @content_item.phase %>
     <% end %>
     <% if @content_item.service_manual? %>
-      <div class="govuk-width-container">
         <%= render_phase_label @content_item, content_for(:phase_message) %>
-      </div>
     <% end %>
 
     <% if @content_item.show_default_breadcrumbs? %>

test/integration/service_manual_phase_label_test.rb

@@ -29,7 +29,9 @@ class ServiceManualPhaseLabelTest < ActionDispatch::IntegrationTest
     stub_content_store_has_item(guide["base_path"], guide)
     visit guide["base_path"]
 
-    assert_text("Alpha")
+    phase_label = find("strong.govuk-tag.govuk-phase-banner__content__tag").text
+
+    assert_match(/alpha/i, phase_label.strip)
   end
 
   test "No phase label is displayed for a guide without a phase field" do