fix(admin): Agregar rows para estructura 2 columnas

- Agregado cierre de row después del card 1
- Agregado apertura de row para cards 2-4
- Corregida indentación de headers dentro de card-body

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

admin-panel/admin/pages/main.php

@@ -61,7 +61,7 @@ if (!defined('ABSPATH')) {
 				<div class="col-md-6">
 					<div class="form-section card shadow-sm border-0 mb-4 h-100">
 						<div class="card-body">
-					<h4 class="section-title">
+							<h4 class="section-title">
 						<span class="title-icon">
 							<i class="bi bi-toggle-on"></i>
 						</span>
@@ -139,13 +139,14 @@ if (!defined('ABSPATH')) {
 				</div>
 			</div>
 
+			<div class="row">
 				<!-- ============================= -->
 				<!-- GRUPO 2: CONTENIDO            -->
 				<!-- ============================= -->
 				<div class="col-md-6">
 					<div class="form-section card shadow-sm border-0 mb-4 h-100">
 						<div class="card-body">
-					<h4 class="section-title">
+							<h4 class="section-title">
 						<span class="title-icon">
 							<i class="bi bi-card-text"></i>
 						</span>
@@ -328,6 +329,7 @@ if (!defined('ABSPATH')) {
 							</div>
 						</div>
 						</div>
+						</div>
 					</div>
 				</div>
 			</div>
@@ -340,7 +342,7 @@ if (!defined('ABSPATH')) {
 				<div class="col-md-6">
 					<div class="form-section card shadow-sm border-0 mb-4 h-100">
 						<div class="card-body">
-					<h4 class="section-title">
+							<h4 class="section-title">
 						<span class="title-icon">
 							<i class="bi bi-palette"></i>
 						</span>