fix: Decode HTML entities in chat responses and improve n8n error handling

- Add HTML entity decoding for chat responses (fixes ' display issue)
- Add timeout handling for n8n webhook requests (30s chat, 10s status)
- Improve error logging with detailed error information
- Add N8N_SECRET_TOKEN support for authentication
- Better fallback handling when n8n is unavailable
- Fix server-side HTML entity decoding for chat and status endpoints

app/components/ChatWidget.tsx

@@ -125,9 +125,19 @@ export default function ChatWidget() {
 
       const data = await response.json();
 
+      // Decode HTML entities in the reply
+      let replyText = data.reply || "Sorry, I couldn't process that. Please try again.";
+      
+      // Decode HTML entities client-side as well (double safety)
+      if (typeof window !== 'undefined') {
+        const textarea = document.createElement('textarea');
+        textarea.innerHTML = replyText;
+        replyText = textarea.value;
+      }
+
       const botMessage: Message = {
         id: (Date.now() + 1).toString(),
-        text: data.reply || "Sorry, I couldn't process that. Please try again.",
+        text: replyText,
         sender: "bot",
         timestamp: new Date(),
       };