feat: completar fases 3 y 4 del roadmap mvp (gradebook, drag-and-drop, impersonacion) y actualizar README

frontend/views/admin/commissions/detail.html

@@ -101,6 +101,18 @@
             </li>
             {% endif %}
           </ul>
+
+          <div class="mt-3 pt-2 border-top">
+            <a href="/schedule/gradebook/{{ commission.id }}" class="btn btn-primary btn-sm w-100 shadow-sm d-flex align-items-center justify-content-center gap-2">
+              <i class="bi bi-journal-check fs-6"></i>
+              <span class="fw-semibold">Libro de Calificaciones (Actas)</span>
+            </a>
+            {% if commission.grades_closed %}
+              <div class="badge bg-danger-subtle text-danger border border-danger-subtle w-100 mt-2 py-2 text-center">
+                <i class="bi bi-lock-fill me-1"></i>Acta Cerrada: {{ commission.acta_number }}
+              </div>
+            {% endif %}
+          </div>
         </div>
       </div>
 

frontend/views/admin/users/list.html

@@ -183,6 +183,9 @@
                                     <i class="bi bi-pencil"></i>
                                 </a>
                                 {% if u.id != user.id %}
+                                    <a href="/auth/impersonate/{{ u.id }}" class="btn btn-outline-info" title="Impersonar usuario (Iniciar sesión como {{ u.name }})">
+                                        <i class="bi bi-incognito"></i>
+                                    </a>
                                     <form action="/admin/user_toggle" method="POST" class="d-inline">
                                         <input type="hidden" name="id" value="{{ u.id }}">
                                         <button type="submit" class="btn {% if u.is_active %}btn-outline-warning{% else %}btn-outline-success{% endif %}"