Initial commit: Luftglanz drone website with integrated AI chat assistant

Features:
- Complete Luftglanz drone cleaning website
- AI chat assistant integrated with OpenAI API
- Expert product advice for AGO Quart and Mellerud cleaning products
- Formal German language support (Sie form)
- Secure PHP backend for API calls
- Responsive design with mobile support
- Product-specific knowledge base
- Safety statements from manufacturers
- Multi-page integration (index, products, services, contact)

Technical components:
- AI chat widget (js/ai-chat.js)
- Chat styling (css/components/ai-chat.css)
- Backend API (ai-chat-api.php)
- Product knowledge base with detailed specifications
- Demo and documentation files

js/navigation.js

@@ -0,0 +1,28 @@
+document.addEventListener('DOMContentLoaded', function() {
+    // Get current page path
+    const currentPath = window.location.pathname;
+    const isInPagesDirectory = currentPath.includes('/pages/');
+    
+    // Handle paths based on directory
+    const navLinks = document.querySelectorAll('#mainNav a');
+    navLinks.forEach(link => {
+        // Get href attribute
+        let href = link.getAttribute('href');
+        
+        // Fix paths if in pages directory
+        if (isInPagesDirectory && href.startsWith('index.html')) {
+            link.setAttribute('href', '../' + href);
+        } else if (isInPagesDirectory && href.startsWith('#')) {
+            link.setAttribute('href', '../index.html' + href);
+        } else if (!isInPagesDirectory && href.startsWith('pages/')) {
+            // No change needed for root directory links to pages
+        }
+        
+        // Set active class based on current page
+        if ((currentPath.endsWith('/index.html') || currentPath.endsWith('/')) && href === 'index.html') {
+            link.classList.add('active');
+        } else if (currentPath.includes(href) && href !== 'index.html') {
+            link.classList.add('active');
+        }
+    });
+});