fix: address linting and security warnings in configuration system

- Add type annotations for mypy compliance
- Add nosec comment for intentional bind-all-interfaces configuration
- Add explanatory comment for exception handling
- Minor formatting improvements

frontend/static/css/style.css

@@ -508,15 +508,15 @@ footer.bg-dark .text-muted {
     }
 
     .form-control {
-        background-color: #2d3748;
+        background-color: var(--bg-secondary);
         border-color: #4a5568;
-        color: #f7fafc;
+        color: #333;
     }
 
     .form-control:focus {
-        background-color: #2d3748;
+        background-color: var(--bg-secondary);
         border-color: var(--primary-color);
-        color: #f7fafc;
+        color: #333;
     }
 }