feat(shell): header multifunc + window._win + float cart/VIP

Multi-type publish/VIP CTA in nav, zibll-like _win runtime bridge for
lightbox flags, and floating shop_cart/pay_vip commerce buttons.

footer.php

@@ -396,6 +396,18 @@ if ($floating_enabled) :
 		<i class="fas fa-sun float-btn__icon-sun" aria-hidden="true"></i>
 		<i class="fas fa-moon float-btn__icon-moon" aria-hidden="true"></i>
 	</a>
+	<?php elseif ($item_type === 'shop_cart') :
+			$cart_html = function_exists('aksrt_get_float_shop_cart_html') ? aksrt_get_float_shop_cart_html($item) : '';
+			if ($cart_html !== '') {
+				echo $cart_html; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+			}
+		?>
+	<?php elseif ($item_type === 'pay_vip') :
+			$vip_html = function_exists('aksrt_get_float_pay_vip_html') ? aksrt_get_float_pay_vip_html($item) : '';
+			if ($vip_html !== '') {
+				echo $vip_html; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+			}
+		?>
 	<?php elseif ($item_type === 'service_wechat') :
             $item_class .= ' service-wechat';
             $wechat_img = $item['wechat_img'] ?? ($item['qrcode_img'] ?? '');
@@ -471,7 +483,17 @@ if ($floating_enabled) :
 		<?php endif; ?>
 	</a>
 	<?php endif; ?>
-	<?php endforeach; ?>
+			<?php
+		// Commerce floats when admin list omits them.
+		$float_types = array_column($floating_items, 'type');
+		if (!in_array('shop_cart', $float_types, true) && function_exists('aksrt_get_float_shop_cart_html')) {
+			echo aksrt_get_float_shop_cart_html(['icon' => 'fas fa-shopping-cart']); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+		}
+		if (!in_array('pay_vip', $float_types, true) && function_exists('aksrt_get_float_pay_vip_html')) {
+			echo aksrt_get_float_pay_vip_html(['icon' => 'fa fa-diamond']); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+		}
+		?>
+<?php endforeach; ?>
 </div>
 <?php endif; ?>