fixing small bugs; improving background handling and removing dead code

components/ConfigurationModal.tsx

@@ -68,7 +68,7 @@ const ConfigurationModal: React.FC<ConfigurationModalProps> = ({
 
   useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
-      if (e.key === 'Escape') handleCloseRef.current();
+      if (e.key === 'Escape' && !e.defaultPrevented) handleCloseRef.current();
     };
     document.addEventListener('keydown', handleKeyDown);
     return () => document.removeEventListener('keydown', handleKeyDown);