Major improvements: Fix download limits, enhance license display, fix software filenames

🔧 Bug Fixes:
- Fixed download limits defaulting to 5 instead of 0 for unlimited downloads
- Fixed software license filename sanitization (spaces→dashes, dots→underscores, proper .zip extension)
- Software downloads now show as "Test-Plugin-v2-2-0.zip" instead of "Test Plugin v2.2.0"

✨ UI/UX Enhancements:
- Redesigned license key display to span full table width with FontAwesome copy icons
- Added responsive CSS styling for license key rows
- Integrated FontAwesome CDN for modern copy icons

🏗️ Architecture Improvements:
- Added comprehensive filename sanitization in both download handler and API paths
- Enhanced software license product handling for local package files
- Improved error handling and logging throughout download processes

📦 Infrastructure:
- Added Gitea workflows for automated releases on push to main
- Created comprehensive .gitignore excluding test files and browser automation
- Updated documentation with all recent improvements and technical insights

🔍 Technical Details:
- Software license products served from wp-content/uploads/wpdd-packages/
- Download flow: token → process_download_by_token() → process_download() → deliver_file()
- Dual path coverage for both API downloads and regular file delivery
- Version placeholder system for automated deployment

🤖 Generated with [Claude Code](https://claude.ai/code)

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

includes/class-wpdd-paypal.php

@@ -109,12 +109,23 @@ class WPDD_PayPal {
         $paypal_order = self::api_request('/v2/checkout/orders', $order_data, 'POST');
         
         if (isset($paypal_order['id'])) {
-            $_SESSION['wpdd_paypal_order_' . $paypal_order['id']] = array(
-                'product_id' => $product_id,
-                'amount' => $final_price,
-                'customer_email' => sanitize_email($_POST['customer_email'] ?? ''),
-                'customer_name' => sanitize_text_field($_POST['customer_name'] ?? '')
-            );
+            // Ensure session is available before storing data
+            if (WP_Digital_Download::ensure_session()) {
+                $_SESSION['wpdd_paypal_order_' . $paypal_order['id']] = array(
+                    'product_id' => $product_id,
+                    'amount' => $final_price,
+                    'customer_email' => sanitize_email($_POST['customer_email'] ?? ''),
+                    'customer_name' => sanitize_text_field($_POST['customer_name'] ?? '')
+                );
+            } else {
+                // Fallback: use WordPress options table with short expiry
+                set_transient('wpdd_paypal_order_' . $paypal_order['id'], array(
+                    'product_id' => $product_id,
+                    'amount' => $final_price,
+                    'customer_email' => sanitize_email($_POST['customer_email'] ?? ''),
+                    'customer_name' => sanitize_text_field($_POST['customer_name'] ?? '')
+                ), 600); // 10 minutes
+            }
             
             wp_send_json_success(array('orderID' => $paypal_order['id']));
         } else {
@@ -134,7 +145,17 @@ class WPDD_PayPal {
         $capture_response = self::api_request('/v2/checkout/orders/' . $paypal_order_id . '/capture', array(), 'POST');
         
         if (isset($capture_response['status']) && $capture_response['status'] === 'COMPLETED') {
-            $session_data = $_SESSION['wpdd_paypal_order_' . $paypal_order_id] ?? array();
+            // Try to get data from session first, then fallback to transient
+            $session_data = array();
+            if (WP_Digital_Download::ensure_session() && isset($_SESSION['wpdd_paypal_order_' . $paypal_order_id])) {
+                $session_data = $_SESSION['wpdd_paypal_order_' . $paypal_order_id];
+            } else {
+                // Try transient fallback
+                $session_data = get_transient('wpdd_paypal_order_' . $paypal_order_id);
+                if ($session_data === false) {
+                    $session_data = array();
+                }
+            }
             
             // Add error logging for debugging session issues
             if (empty($session_data)) {
@@ -212,7 +233,11 @@ class WPDD_PayPal {
             update_post_meta($session_data['product_id'], '_wpdd_sales_count', 
                 intval(get_post_meta($session_data['product_id'], '_wpdd_sales_count', true)) + 1);
             
-            unset($_SESSION['wpdd_paypal_order_' . $paypal_order_id]);
+            // Clean up stored data (both session and transient)
+            if (WP_Digital_Download::ensure_session() && isset($_SESSION['wpdd_paypal_order_' . $paypal_order_id])) {
+                unset($_SESSION['wpdd_paypal_order_' . $paypal_order_id]);
+            }
+            delete_transient('wpdd_paypal_order_' . $paypal_order_id);
             
             wp_send_json_success(array(
                 'redirect_url' => add_query_arg(
@@ -267,8 +292,26 @@ class WPDD_PayPal {
     private static function generate_download_link($order_id) {
         global $wpdb;
         
+        // Get the order to find the product
+        $order = $wpdb->get_row($wpdb->prepare(
+            "SELECT * FROM {$wpdb->prefix}wpdd_orders WHERE id = %d",
+            $order_id
+        ));
+        
+        if (!$order) {
+            return false;
+        }
+        
+        // Get download limit from product settings
+        $download_limit = get_post_meta($order->product_id, '_wpdd_download_limit', true);
+        $download_limit = $download_limit ?: 0; // Default to 0 (unlimited) if not set
+        
+        // Get download expiry from product settings
+        $download_expiry = get_post_meta($order->product_id, '_wpdd_download_expiry', true);
+        $download_expiry = $download_expiry ?: 30; // Default to 30 days if not set
+        
         $token = wp_hash(uniqid() . $order_id . time());
-        $expires_at = date('Y-m-d H:i:s', strtotime('+7 days'));
+        $expires_at = date('Y-m-d H:i:s', strtotime('+' . $download_expiry . ' days'));
         
         $wpdb->insert(
             $wpdb->prefix . 'wpdd_download_links',
@@ -276,7 +319,7 @@ class WPDD_PayPal {
                 'order_id' => $order_id,
                 'token' => $token,
                 'expires_at' => $expires_at,
-                'max_downloads' => 5,
+                'max_downloads' => $download_limit,
                 'created_at' => current_time('mysql')
             ),
             array('%d', '%s', '%s', '%d', '%s')