🚀 VERSION 16.0.0 RELEASE: Complete Plugin Modernization

📋 VERSION UPDATE:
- Updated plugin version to 16.0.0
- Updated CFORMS2_VERSION constant to 16.0.0
- Added comprehensive changelog for version 16.0.0

�� MAJOR FEATURES IN 16.0.0:
✅ TIMEZONE FIX: Completely resolved 2-hour shift issue in form start/end dates
✅ MOBILE ADMIN: Touch-optimized interface with 44px+ buttons and full-width textareas
✅ DESKTOP MODERNIZATION: Modern card-based admin interface with professional styling
✅ SECURITY: Enterprise-level CSRF protection, input sanitization, and rate limiting
✅ PERFORMANCE: Optimized asset loading, advanced caching, and session management
✅ CODE QUALITY: Removed 800+ lines of unused code while preserving functionality

📝 CHANGELOG HIGHLIGHTS:
- Proper WordPress timezone integration with DateTime objects
- German user guidance and landscape orientation tips
- Multi-layer CSRF protection with session validation
- Context-aware input sanitization for all field types
- Comprehensive file upload security checks
- Rate limiting and brute-force protection
- Security event logging and monitoring
- Conditional CSS/JS loading for better performance
- Advanced caching for locale and datetime formats
- Frontend remains unchanged (admin-only improvements)

This major release transforms cforms2 into a modern, secure, and
mobile-friendly WordPress plugin while maintaining full backward compatibility.

Author: Wolfgang Tischer

cforms.php

@@ -20,13 +20,13 @@
  * Plugin URI: https://wordpress.org/plugins/cforms2/
  * Description: cformsII is a customizable, flexible and powerful form plugin including simple spam protection, multi-step forms, role manager support and custom themes.
  * Author: Oliver Seidel, Bastian Germann
- * Version: 15.1.2
+ * Version: 16.0.0
  * Requires at least: 6.9
  * Text Domain: cforms2
  */
 namespace Cforms2;
 
-define('CFORMS2_VERSION', '15.1.2');
+define('CFORMS2_VERSION', '16.0.0');
 
 // Debug message handling.
 if (!defined('WP_DEBUG_CFORMS2')) {

readme.txt

@@ -92,6 +92,29 @@ The tracking database feature and its view are removed with cformsII 15.0+. Your
 
 == Changelog ==
 
+= 16.0.0 =
+
+* feature:  TIMEZONE FIX: Completely resolved 2-hour shift issue in form start/end dates
+* feature:  MOBILE ADMIN INTERFACE: Touch-optimized form navigation with 44px+ buttons
+* feature:  MOBILE ADMIN INTERFACE: Full-width textareas for comfortable mobile editing
+* feature:  MOBILE ADMIN INTERFACE: German user guidance and landscape orientation tips
+* feature:  DESKTOP MODERNIZATION: Modern card-based admin interface design
+* feature:  DESKTOP MODERNIZATION: Professional styling with shadows and rounded corners
+* enhanced: CODE QUALITY: Removed unused mobile-responsive.css (800+ lines cleaned up)
+* enhanced: CODE QUALITY: Cleaned up unnecessary comments while preserving meaningful documentation
+* enhanced: SECURITY: Enterprise-level multi-layer CSRF protection with session validation
+* enhanced: SECURITY: Context-aware input sanitization for all field types
+* enhanced: SECURITY: Comprehensive file upload security checks and validation
+* enhanced: SECURITY: Rate limiting and brute-force protection mechanisms
+* enhanced: SECURITY: Security event logging and monitoring capabilities
+* enhanced: PERFORMANCE: Optimized asset loading with conditional CSS/JS inclusion
+* enhanced: PERFORMANCE: Advanced caching strategies for locale and datetime formats
+* enhanced: PERFORMANCE: Improved session management with conditional session starts
+* enhanced: TIMEZONE HANDLING: Proper WordPress timezone integration with DateTime objects
+* enhanced: TIMEZONE HANDLING: Consistent local time display and processing
+* enhanced: FRONTEND UNCHANGED: No mobile optimizations in frontend (admin-only improvements)
+* other:    This major update transforms cforms2 into a modern, secure, mobile-friendly WordPress plugin
+
 = 15.1.2 =
 
 * bugfix:   Construct multipart/alternative emails