fix: category selection, checkout redirect, sidebar shipping visibility

1. Category Selection Bug:
   - Added 'id' alias to category/tag API responses
   - Frontend uses cat.id which was undefined (API returned term_id)

2. Checkout Redirect:
   - Changed from window.location.href + reload to navigate()
   - Added !isProcessing check to empty cart condition

3. Sidebar Shipping for Virtual-Only:
   - Hide Shipping Method section when isVirtualOnly
   - Hide Shipping row in totals when isVirtualOnly

4. License Table:
   - Table creation runs via ensure_tables() on plugins_loaded

customer-spa/src/pages/Checkout/index.tsx

@@ -304,11 +304,11 @@ export default function Checkout() {
 
         toast.success('Order placed successfully!');
 
-        // Use full page reload instead of SPA routing
-        // This ensures auto-registered users get their auth cookies properly set
-        const thankYouUrl = `${window.location.origin}/store/#/order-received/${data.order_id}?key=${data.order_key}`;
-        window.location.href = thankYouUrl;
-        window.location.reload();
+        // Navigate to thank you page via SPA routing
+        // Using window.location.replace to prevent back button issues
+        const thankYouUrl = `/order-received/${data.order_id}?key=${data.order_key}`;
+        navigate(thankYouUrl, { replace: true });
+        return; // Stop execution here
       } else {
         throw new Error(data.error || 'Failed to create order');
       }
@@ -320,8 +320,8 @@ export default function Checkout() {
     }
   };
 
-  // Empty cart redirect
-  if (cart.items.length === 0) {
+  // Empty cart redirect (but only if not processing)
+  if (cart.items.length === 0 && !isProcessing) {
     return (
       <Container>
         <div className="text-center py-16">
@@ -771,7 +771,7 @@ export default function Checkout() {
                 </div>
 
                 {/* Shipping Options */}
-                {elements.shipping_options && (
+                {!isVirtualOnly && elements.shipping_options && (
                   <div className="mb-4 pb-4 border-b">
                     <h3 className="font-medium mb-3">Shipping Method</h3>
                     <div className="space-y-2">
@@ -806,10 +806,12 @@ export default function Checkout() {
                       <span>-{formatPrice(discountTotal)}</span>
                     </div>
                   )}
-                  <div className="flex justify-between text-sm">
-                    <span>Shipping</span>
-                    <span>{shipping === 0 ? 'Free' : formatPrice(shipping)}</span>
-                  </div>
+                  {!isVirtualOnly && (
+                    <div className="flex justify-between text-sm">
+                      <span>Shipping</span>
+                      <span>{shipping === 0 ? 'Free' : formatPrice(shipping)}</span>
+                    </div>
+                  )}
                   {tax > 0 && (
                     <div className="flex justify-between text-sm">
                       <span>Tax</span>