Google Merchant Center trust signal improvements

- Add contact.php (was 404, linked from footer and returns page)
- Add shippingDetails and hasMerchantReturnPolicy to product schema
- Add priceValidUntil to product Offer schema
- Improve merchant feed descriptions (use DB description when present)
- Add handling/transit times and return_policy_label to feed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

product.php

@@ -69,12 +69,32 @@ $productSchemaData = [
     'description' => $metaDescription,
     'brand'    => ['@type' => 'Brand', 'name' => "Tom's Java Jive"],
     'offers'   => [
-        '@type'         => 'Offer',
-        'priceCurrency' => 'USD',
-        'price'         => number_format((float) $displayPrice, 2, '.', ''),
-        'availability'  => $inStock ? 'https://schema.org/InStock' : 'https://schema.org/OutOfStock',
-        'url'           => $canonicalUrl,
-        'seller'        => ['@type' => 'Organization', 'name' => "Tom's Java Jive"],
+        '@type'              => 'Offer',
+        'priceCurrency'      => 'USD',
+        'price'              => number_format((float) $displayPrice, 2, '.', ''),
+        'priceValidUntil'    => date('Y-12-31', strtotime('+1 year')),
+        'availability'       => $inStock ? 'https://schema.org/InStock' : 'https://schema.org/OutOfStock',
+        'url'                => $canonicalUrl,
+        'seller'             => ['@type' => 'Organization', 'name' => "Tom's Java Jive"],
+        'shippingDetails'    => [
+            '@type'              => 'OfferShippingDetails',
+            'shippingRate'       => ['@type' => 'MonetaryAmount', 'value' => '5.99', 'currency' => 'USD'],
+            'shippingDestination'=> ['@type' => 'DefinedRegion', 'addressCountry' => 'US'],
+            'deliveryTime'       => [
+                '@type'           => 'ShippingDeliveryTime',
+                'handlingTime'    => ['@type' => 'QuantitativeValue', 'minValue' => 1, 'maxValue' => 2, 'unitCode' => 'DAY'],
+                'transitTime'     => ['@type' => 'QuantitativeValue', 'minValue' => 3, 'maxValue' => 7, 'unitCode' => 'DAY'],
+            ],
+        ],
+        'hasMerchantReturnPolicy' => [
+            '@type'                    => 'MerchantReturnPolicy',
+            'applicableCountry'        => 'US',
+            'returnPolicyCategory'     => 'https://schema.org/MerchantReturnFiniteReturnWindow',
+            'merchantReturnDays'       => 30,
+            'returnMethod'             => 'https://schema.org/ReturnByMail',
+            'returnFees'               => 'https://schema.org/FreeReturn',
+            'returnPolicyLink'         => 'https://tomsjavajive.com/returns.php',
+        ],
     ],
 ];
 if ($reviewCount > 0) {