Initial commit: DNS Things - Comprehensive DNS utility website

Features implemented:
- Modular JavaScript architecture (theme.js, dns-tools.js, whois.js, punycode.js, ip-tools.js, main.js)
- Responsive design with dark/light theme toggle
- DNS Lookup and Reverse DNS Lookup tools
- Whois Lookup functionality
- IDN Punycode Converter with full Unicode support
- Comprehensive IP Address Tools (validation, IPv4-to-IPv6 mapping, IPv6 compression/expansion)
- Dynamic tab descriptions that change based on active tool
- Mobile-responsive horizontal scrollable tabs
- Copy-to-clipboard functionality for all results
- Clean footer with dynamic year
- IPv4-mapped IPv6 address explanation with clear warnings

Technical improvements:
- Separated concerns with modular JS files
- Fixed browser compatibility issues with punycode library
- Implemented proper error handling and user feedback
- Added comprehensive input validation
- Optimized for mobile devices with touch-friendly UI

assets/js/main.js

@@ -0,0 +1,33 @@
+// DNS Things - Main Application Initialization
+
+// Initialize everything when DOM is loaded
+document.addEventListener('DOMContentLoaded', function() {
+    // Initialize core UI components
+    initTheme();
+    initTabs();
+    initCopyButtons();
+    
+    // Initialize DNS tools
+    initIPDisplay();
+    initDNSForm();
+    initReverseDNSForm();
+    
+    // Initialize additional tools
+    initWhoisForm();
+    initPunycodeConverter();
+    initIPTools();
+    
+    // Set dynamic year in footer
+    initFooter();
+    
+    console.log('DNS Things application initialized successfully');
+});
+
+// Initialize footer with dynamic year
+function initFooter() {
+    const yearElement = document.getElementById('current-year');
+    if (yearElement) {
+        const currentYear = new Date().getFullYear();
+        yearElement.textContent = currentYear;
+    }
+}