fix(admin): use templateReferenceId for template navigation

Changed all template actions (edit, download, duplicate, delete) to use
the stable templateReferenceId instead of documentId. The backend findOne
resolves numeric IDs via templateReferenceId lookup, ensuring the correct
template is always opened.

Author: Schero94

admin/src/pages/EmailDesigner/TemplateList.jsx

@@ -1113,8 +1113,8 @@ const TemplateList = () => {
       fetchStats();
 
       // Navigate to the duplicated template
-      if (duplicated?.documentId) {
-        navigate(`/plugins/magic-mail/designer/${duplicated.documentId}`);
+      if (duplicated?.templateReferenceId) {
+        navigate(`/plugins/magic-mail/designer/${duplicated.templateReferenceId}`);
       }
     } catch (error) {
       toggleNotification({
@@ -1523,7 +1523,7 @@ const TemplateList = () => {
             </Thead>
             <Tbody>
               {paginatedTemplates.map((template) => (
-                <Tr key={template.documentId}>
+                <Tr key={template.templateReferenceId}>
                   <Td>
                     <Typography variant="omega" fontWeight="bold" style={{ fontSize: '13px' }}>
                       #{template.templateReferenceId}
@@ -1544,29 +1544,29 @@ const TemplateList = () => {
                     <Flex gap={2} justifyContent="flex-end">
                       <IconButtonPrimary
                         onClick={() =>
-                          navigate(`/plugins/magic-mail/designer/${template.documentId}`)
+                          navigate(`/plugins/magic-mail/designer/${template.templateReferenceId}`)
                         }
                         aria-label="Edit Template"
                         title="Edit Template"
                       >
                         <PencilIcon />
                       </IconButtonPrimary>
                       <IconButton
-                        onClick={() => handleDownload(template.documentId, 'html')}
+                        onClick={() => handleDownload(template.templateReferenceId, 'html')}
                         aria-label="Download HTML"
                         title="Download as HTML"
                       >
                         <DocumentArrowDownIcon />
                       </IconButton>
                       <IconButton
-                        onClick={() => handleDownload(template.documentId, 'json')}
+                        onClick={() => handleDownload(template.templateReferenceId, 'json')}
                         aria-label="Download JSON"
                         title="Download as JSON"
                       >
                         <CodeBracketIcon />
                       </IconButton>
                       <IconButton
-                        onClick={() => handleDuplicate(template.documentId, template.name)}
+                        onClick={() => handleDuplicate(template.templateReferenceId, template.name)}
                         aria-label="Duplicate Template"
                         title="Duplicate Template"
                       >
@@ -1590,7 +1590,7 @@ const TemplateList = () => {
                         <PaperAirplaneIcon />
                       </IconButtonSuccess>
                       <IconButtonDanger
-                        onClick={() => handleDelete(template.documentId, template.name)}
+                        onClick={() => handleDelete(template.templateReferenceId, template.name)}
                         aria-label="Delete Template"
                         title="Delete Template"
                       >