Aug 7 - Update remove the switching design button from the sidebar

app/templates/layouts/modern.html

@@ -293,16 +293,10 @@
             </a>
         </nav>
 
-        <div class="jqc-sidebar-foot">
-            <form method="POST" action="{{ url_for('ui.switch_theme') }}">
-                <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
-                <input type="hidden" name="theme" value="classic">
-                <input type="hidden" name="next" value="{{ request.full_path }}">
-                <button type="submit" class="jqc-switch-btn" title="Switch back to the classic design">
-                    <i class="bi bi-arrow-left-right"></i> Classic Design
-                </button>
-            </form>
-        </div>
+        {# The design switcher was removed from the sidebar in phase50, when
+           modern became the default — it no longer belongs in the primary nav.
+           The same action still exists in the account menu (top right), so
+           anyone who needs the classic design can still get to it. #}
     </aside>
     <div class="jqc-sidebar-backdrop d-lg-none" id="jqcSidebarBackdrop"></div>
     {% endif %}