Fix: Add safe localStorage wrapper and QZ Tray toggle feature

- Created storage-utils.js with safeStorage wrapper to prevent tracking prevention errors
- Updated script.js to use safeStorage for theme persistence
- Added conditional QZ Tray connection based on 'Enable Scan to Boxes' toggle
- Fixed 404 error by removing non-existent /api/backup/path endpoint call
- Enhanced fg_scan.html to disable QZ Tray and socket connections when toggle is off
- Prevents console errors when browser tracking prevention blocks localStorage access

py_app/app/templates/base.html

@@ -65,6 +65,8 @@
     <div class="main-content">
         {% block content %}{% endblock %}
     </div>
+    <!-- Safe localStorage utility (must load first) -->
+    <script src="{{ url_for('static', filename='js/storage-utils.js') }}"></script>
     {% if request.endpoint != 'main.fg_quality' %}
     <script src="{{ url_for('static', filename='script.js') }}"></script>
     {% endif %}

py_app/app/templates/settings.html

@@ -2834,27 +2834,11 @@ document.getElementById('restore-btn')?.addEventListener('click', function() {
 
 // Load backup location path
 function loadBackupPath() {
-    fetch('/api/backup/path')
-        .then(response => response.json())
-        .then(data => {
-            const pathElement = document.getElementById('backup-location-path');
-            if (pathElement) {
-                if (data.success && data.backup_path) {
-                    pathElement.textContent = data.backup_path;
-                } else {
-                    // Use fallback if API fails
-                    pathElement.textContent = '/srv/quality_app/backups';
-                }
-            }
-        })
-        .catch(error => {
-            console.error('Error loading backup path:', error);
-            // Set fallback if fetch fails
-            const pathElement = document.getElementById('backup-location-path');
-            if (pathElement) {
-                pathElement.textContent = '/srv/quality_app/backups';
-            }
-        });
+    // Set the default backup path directly (no API call needed)
+    const pathElement = document.getElementById('backup-location-path');
+    if (pathElement) {
+        pathElement.textContent = '/srv/quality_app/backups';
+    }
 }
 
 // Load backup data on page load