feat: Go-to-Account button + wishlist merge on login

1. ThankYou page - Go to Account button:
   - Added for logged-in users (next to Continue Shopping)
   - Shows in both receipt and basic templates
   - Uses outline variant with User icon

2. Wishlist merge on login:
   - Reads guest wishlist from localStorage (woonoow_guest_wishlist)
   - POSTs each product to /account/wishlist API
   - Handles duplicates gracefully (skips on error)
   - Clears localStorage after successful merge

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

@@ -2,7 +2,7 @@ import React, { useEffect, useState } from 'react';
 import { useParams, Link, useSearchParams } from 'react-router-dom';
 import { useThankYouSettings } from '@/hooks/useAppearanceSettings';
 import Container from '@/components/Layout/Container';
-import { CheckCircle, ShoppingBag, Package, Truck } from 'lucide-react';
+import { CheckCircle, ShoppingBag, Package, Truck, User } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { formatPrice } from '@/lib/currency';
 import { apiClient } from '@/lib/api/client';
@@ -16,6 +16,7 @@ export default function ThankYou() {
   const [relatedProducts, setRelatedProducts] = useState<any[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
+  const isLoggedIn = (window as any).woonoowCustomer?.user?.isLoggedIn;
 
   useEffect(() => {
     const fetchOrderData = async () => {
@@ -186,14 +187,24 @@ export default function ThankYou() {
                     : 'Thank you for your business!'}
                 </p>
 
-                {elements.continue_shopping_button && (
-                  <Link to="/shop">
-                    <Button size="lg" className="gap-2">
-                      <ShoppingBag className="w-5 h-5" />
-                      Continue Shopping
-                    </Button>
-                  </Link>
-                )}
+                <div className="flex flex-col sm:flex-row gap-3 justify-center">
+                  {elements.continue_shopping_button && (
+                    <Link to="/shop">
+                      <Button size="lg" className="gap-2">
+                        <ShoppingBag className="w-5 h-5" />
+                        Continue Shopping
+                      </Button>
+                    </Link>
+                  )}
+                  {isLoggedIn && (
+                    <Link to="/my-account">
+                      <Button size="lg" variant="outline" className="gap-2">
+                        <User className="w-5 h-5" />
+                        Go to Account
+                      </Button>
+                    </Link>
+                  )}
+                </div>
               </div>
             </div>
 
@@ -430,17 +441,25 @@ export default function ThankYou() {
             </div>
           )}
 
-          {/* Continue Shopping Button */}
-          {elements.continue_shopping_button && (
-            <div className="text-center">
+          {/* Action Buttons */}
+          <div className="text-center flex flex-col sm:flex-row gap-3 justify-center">
+            {elements.continue_shopping_button && (
               <Link to="/shop">
                 <Button size="lg" className="gap-2">
                   <ShoppingBag className="w-5 h-5" />
                   Continue Shopping
                 </Button>
               </Link>
-            </div>
-          )}
+            )}
+            {isLoggedIn && (
+              <Link to="/my-account">
+                <Button size="lg" variant="outline" className="gap-2">
+                  <User className="w-5 h-5" />
+                  Go to Account
+                </Button>
+              </Link>
+            )}
+          </div>
 
           {/* Related Products */}
           {elements.related_products && relatedProducts.length > 0 && (