Создание вкладки "Расписание занятий"

frontend/admin/index.html

@@ -86,6 +86,15 @@
                 </svg>
                 Дисциплины
             </a>
+            <a href="#" class="nav-item" data-tab="schedule">
+                <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                    <rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect>
+                    <line x1="16" y1="2" x2="16" y2="6"></line>
+                    <line x1="8" y1="2" x2="8" y2="6"></line>
+                    <line x1="3" y1="10" x2="21" y2="10"></line>
+                </svg>
+                Расписание занятий
+            </a>
         </nav>
         <div class="sidebar-footer">
             <button class="btn-logout" id="btn-logout">