Fix dashboard JavaScript errors and add favicon

- Fixed syntax error in dashboard.js (missing closing bracket for DOMContentLoaded)
- Added favicon.ico file to static directory
- Added favicon link to dashboard HTML template
- All JavaScript errors should now be resolved
- Dashboard should load without console errors

src/dashboard/templates.py

@@ -9,6 +9,7 @@ DASHBOARD_HTML = """
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Calejo Control Adapter - Dashboard</title>
+    <link rel="icon" type="image/x-icon" href="/static/favicon.ico">
     <style>
         body {
             font-family: Arial, sans-serif;

static/dashboard.js

@@ -506,4 +506,5 @@ async function exportSignals() {
 document.addEventListener('DOMContentLoaded', function() {
     // Load initial status
     loadStatus();
+});