feat: add Refresh Prices button to pull WC prices for existing mappings

Existing mapped products had no WC price since they were fetched before
the woo_price field existed. action_refresh_prices fetches current prices
from WC API for all mapped products.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fusion-woo-odoo/fusion_woocommerce/models/woo_instance.py

@@ -280,6 +280,34 @@ class WooInstance(models.Model):
                        'Fetched %d products, auto-matched %d by SKU' % (total_fetched, auto_matched))
         return True
 
+    def action_refresh_prices(self):
+        """Refresh WC prices for all mapped products from WooCommerce API."""
+        self.ensure_one()
+        if self.state != 'connected':
+            raise UserError("Instance is not connected.")
+        client = self._get_client()
+        maps = self.env['woo.product.map'].search([
+            ('instance_id', '=', self.id),
+            ('woo_product_id', '>', 0),
+        ])
+        updated = 0
+        for m in maps:
+            try:
+                wc_prod = client.get_product(m.woo_product_id)
+                wc_price = 0.0
+                try:
+                    wc_price = float(wc_prod.get('regular_price') or wc_prod.get('price') or 0)
+                except (ValueError, TypeError):
+                    pass
+                if wc_price != m.woo_price:
+                    m.woo_price = wc_price
+                    updated += 1
+            except Exception as e:
+                _logger.warning("Failed to refresh price for WC#%s: %s", m.woo_product_id, e)
+        self._log_sync('product', 'woo_to_odoo', self.name, 'success',
+                       'Refreshed prices for %d products' % updated)
+        return True
+
     def action_sync(self):
         """Manual sync trigger from the UI."""
         self.ensure_one()