feat: never-expire Telegram session + logout confirmation on both channels

- STATE_TTL: 7200s → 315360000s (10 years) so sessions survive indefinitely
- Telegram: "salir"/"/salir" now shows inline confirmation keyboard instead of going straight to menu; "Cerrar sesión" button added to main menu; logout_ask/logout_confirm/confirmLogout() handler clears state and returns to email prompt
- Web chat: "Cerrar sesión" button in main menu; clicking it shows a confirmation message with "Sí, cerrar sesión" / "No, quedarme" buttons; only the confirmed action calls cerrarSesion()

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Http/Livewire/Chat/PublicChat.php

@@ -171,6 +171,25 @@ class PublicChat extends Component
         $this->paso            = 'email';
     }
 
+    public function confirmarCierreSesion(): void
+    {
+        if (! $this->convId) {
+            return;
+        }
+
+        ChatMessage::create([
+            'conversation_id' => $this->convId,
+            'tipo'            => 'bot',
+            'tipo_ui'         => 'buttons',
+            'contenido'       => '¿Seguro que deseas cerrar sesión? Tendrás que volver a ingresar tu correo y código la próxima vez.',
+            'payload'         => ['botones' => [
+                ['label' => '✅ Sí, cerrar sesión', 'action' => 'sesion.cerrar.confirmar', 'data' => []],
+                ['label' => '❌ No, quedarme',       'action' => 'menu.principal',           'data' => []],
+            ]],
+            'leido' => true,
+        ]);
+    }
+
     public function cerrarSesion(): void
     {
         session()->forget(['chat_user_id', 'chat_conv_id']);
@@ -407,6 +426,8 @@ class PublicChat extends Component
             $action === 'perfil.ver'            => $this->verPerfil(),
             $action === 'asesor.solicitar'      => $this->solicitarAsesor(),
             $action === 'pago.aplicar'          => $this->aplicarRecargaValidada($data),
+            $action === 'sesion.cerrar'         => $this->confirmarCierreSesion(),
+            $action === 'sesion.cerrar.confirmar' => $this->cerrarSesion(),
             default                             => $this->mostrarMenuPrincipal($this->convId),
         };
 
@@ -515,6 +536,7 @@ class PublicChat extends Component
                 ['label' => 'Historial',           'action' => 'historial.ver',       'data' => []],
                 ['label' => 'Mi Perfil',           'action' => 'perfil.ver',          'data' => []],
                 ['label' => 'Hablar con asesor',   'action' => 'asesor.solicitar',    'data' => []],
+                ['label' => '🚪 Cerrar sesión',    'action' => 'sesion.cerrar',       'data' => []],
             ]],
             'leido' => true,
         ]);