Improve CARD action error messages and default loader columns

Show actual CARD API error messages (e.g., 'Cannot redirect asset
because Team is neither confirmed nor pending owner') instead of
generic 'Redirect failed.' or 'confirm failed.' messages.

Also auto-select IPV4_ADDRESS, EQUIP_NAME, and RESPONSIBLE_TEAM
columns by default in the Loader Modal for better initial UX.

frontend/src/components/LoaderModal.js

@@ -94,12 +94,16 @@ export default function LoaderModal({ isOpen, onClose, initialDevices }) {
     setValidationWarnings([]);
   }, [isOpen, initialDevices]);
 
-  // Auto-select required columns when operation type changes
+  // Auto-select required columns + useful defaults when operation type changes
   useEffect(() => {
     const required = getRequiredColumns(operationType);
     setSelectedColumns(prev => {
       const next = new Set(prev);
       required.forEach(id => next.add(id));
+      // Always include these useful columns by default
+      next.add('IPV4_ADDRESS');
+      next.add('EQUIP_NAME');
+      next.add('RESPONSIBLE_TEAM');
       return next;
     });
   }, [operationType]);