feat: implementacion de dashboards por rol, soporte de clases virtuales concurrentes en importador de sheets y cartelera del dia

frontend/views/partials/language_switcher.html

@@ -0,0 +1,34 @@
+{% if config.LANGUAGES|length > 1 %}
+<div class="dropdown language-switcher">
+    <button class="btn btn-outline-secondary btn-sm dropdown-toggle d-flex align-items-center" type="button" id="languageDropdown" data-bs-toggle="dropdown" aria-expanded="false">
+        <i class="bi bi-globe me-1"></i>
+        <span>
+        {% if current_lang == 'es' %}
+            Español
+        {% else %}
+            English
+        {% endif %}
+        </span>
+    </button>
+    <ul class="dropdown-menu dropdown-menu-end shadow-sm" aria-labelledby="languageDropdown">
+        <li>
+            <a class="dropdown-item d-flex align-items-center justify-content-between {% if current_lang == 'es' %}active{% endif %}" 
+               href="/main/set_language">
+                <span>Español</span>
+                {% if current_lang == 'es' %}
+                    <i class="bi bi-check-lg ms-2 text-white"></i>
+                {% endif %}
+            </a>
+        </li>
+        <li>
+            <a class="dropdown-item d-flex align-items-center justify-content-between {% if current_lang == 'en' %}active{% endif %}" 
+               href="/main/set_language">
+                <span>English</span>
+                {% if current_lang == 'en' %}
+                    <i class="bi bi-check-lg ms-2 text-white"></i>
+                {% endif %}
+            </a>
+        </li>
+    </ul>
+</div>
+{% endif %}

frontend/views/partials/view_switcher.html

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+{# Componente reutilizable: Selector de vista (Tabla / Grilla vs. Tarjetas / Mosaico) #}
+<div class="btn-group btn-group-sm shadow-sm view-switcher-group" 
+     role="group" 
+     aria-label="Selector de Vista" 
+     data-context="{{ context_id|default('default') }}"
+     data-default-view="{{ default_view|default('cards') }}">
+    <button type="button" 
+            class="btn btn-outline-secondary view-switcher-btn" 
+            data-view="table" 
+            title="Vista de Tabla / Grilla (filas, columnas y análisis denso)">
+        <i class="bi bi-table me-1"></i>
+        <span class="d-none d-sm-inline">Tabla</span>
+    </button>
+    <button type="button" 
+            class="btn btn-outline-secondary view-switcher-btn" 
+            data-view="cards" 
+            title="Vista de Tarjetas / Mosaico (amigable, visual y responsive)">
+        <i class="bi bi-grid-fill me-1"></i>
+        <span class="d-none d-sm-inline">Tarjetas</span>
+    </button>
+</div>