fix(chat): capture template name/lang before closing modal in sendTemplate

closeTemplatePicker() sets _tplSelected = null, so accessing
_tplSelected.template_name after the call threw a TypeError caught
as "Error de red al enviar plantilla".

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

modules/turnero/views/chat.php

@@ -1002,7 +1002,10 @@ async function sendTemplate() {
     const missing = params.findIndex(p => !p);
     if (missing !== -1) { inputs[missing].focus(); return; }
 
+    const templateName = _tplSelected.template_name;
+    const templateLang = _tplSelected.language_code;
     closeTemplatePicker();
+
     try {
         const res  = await fetch(BASE + API_SEND, {
             method: 'POST',
@@ -1010,8 +1013,8 @@ async function sendTemplate() {
             body: JSON.stringify({
                 user_id: state.activeUserId,
                 type:     'template',
-                template: _tplSelected.template_name,
+                template: templateName,
-                lang:     _tplSelected.language_code,
+                lang:     templateLang,
                 params
             })
         });