Implement version 0.0.8 features

- Remove Current Version field from product license settings
- Derive current version from latest product version in database
- Refactor email system to use WooCommerce email notification classes
- Add LicenseExpirationEmail WC_Email class for expiration warnings
- Add customizable email templates (HTML and plain text)
- Update settings to link to WooCommerce email configuration
- Update translations for new email-related strings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/emails/license-expiration.php

@@ -0,0 +1,97 @@
+<?php
+/**
+ * License Expiration Warning Email (HTML)
+ *
+ * This template can be overridden by copying it to yourtheme/woocommerce/emails/license-expiration.php.
+ *
+ * @package Jeremias\WcLicensedProduct\Templates\Emails
+ * @version 0.0.8
+ *
+ * @var \Jeremias\WcLicensedProduct\License\License $license
+ * @var int $days_remaining
+ * @var string $product_name
+ * @var string $expiration_date
+ * @var string $email_heading
+ * @var string $additional_content
+ * @var bool $sent_to_admin
+ * @var bool $plain_text
+ * @var \Jeremias\WcLicensedProduct\Email\LicenseExpirationEmail $email
+ */
+
+defined('ABSPATH') || exit;
+
+/*
+ * @hooked WC_Emails::email_header() Output the email header
+ */
+do_action('woocommerce_email_header', $email_heading, $email);
+
+$customer = get_userdata($license->getCustomerId());
+$customer_name = $customer ? $customer->display_name : __('Customer', 'wc-licensed-product');
+$account_url = wc_get_account_endpoint_url('licenses');
+?>
+
+<p><?php printf(esc_html__('Hello %s,', 'wc-licensed-product'), esc_html($customer_name)); ?></p>
+
+<?php if ($days_remaining === 1) : ?>
+    <p style="color: #dc3545; font-weight: 600;">
+        <?php printf(
+            esc_html__('Your license for %s will expire tomorrow (%s).', 'wc-licensed-product'),
+            esc_html($product_name),
+            esc_html($expiration_date)
+        ); ?>
+    </p>
+<?php else : ?>
+    <p style="color: #856404; font-weight: 600;">
+        <?php printf(
+            esc_html__('Your license for %1$s will expire in %2$d days (%3$s).', 'wc-licensed-product'),
+            esc_html($product_name),
+            $days_remaining,
+            esc_html($expiration_date)
+        ); ?>
+    </p>
+<?php endif; ?>
+
+<h2><?php esc_html_e('License Details', 'wc-licensed-product'); ?></h2>
+
+<div style="margin-bottom: 40px;">
+    <table class="td" cellspacing="0" cellpadding="6" style="width: 100%; font-family: 'Helvetica Neue', Helvetica, Roboto, Arial, sans-serif;" border="1">
+        <tbody>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('Product:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left;"><?php echo esc_html($product_name); ?></td>
+            </tr>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('License Key:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left;">
+                    <code style="background: #f5f5f5; padding: 3px 8px; border-radius: 3px; font-family: monospace;">
+                        <?php echo esc_html($license->getLicenseKey()); ?>
+                    </code>
+                </td>
+            </tr>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('Domain:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left;"><?php echo esc_html($license->getDomain()); ?></td>
+            </tr>
+            <tr>
+                <th class="td" scope="row" style="text-align:left;"><?php esc_html_e('Expires:', 'wc-licensed-product'); ?></th>
+                <td class="td" style="text-align:left; color: #dc3545; font-weight: 600;"><?php echo esc_html($expiration_date); ?></td>
+            </tr>
+        </tbody>
+    </table>
+</div>
+
+<?php if ($additional_content) : ?>
+    <p><?php echo wp_kses_post($additional_content); ?></p>
+<?php endif; ?>
+
+<p style="margin-top: 25px;">
+    <a href="<?php echo esc_url($account_url); ?>" style="display: inline-block; background: #7f54b3; color: #fff; padding: 12px 24px; text-decoration: none; border-radius: 4px; font-weight: 600;">
+        <?php esc_html_e('View My Licenses', 'wc-licensed-product'); ?>
+    </a>
+</p>
+
+<?php
+/*
+ * @hooked WC_Emails::email_footer() Output the email footer
+ */
+do_action('woocommerce_email_footer', $email);