fix: update delete button behavior in TreeCategoryHeader and TeamsList

- Removed unnecessary canDelete prop from TreeCategoryHeader's delete button condition.
- Added disabled state to the delete button based on canDelete logic.
- Updated canDelete prop in TeamsList to reflect whether the direction has members.

components/admin/management/tree-category-header.tsx

@@ -66,7 +66,7 @@ export function TreeCategoryHeader({
             {itemCount} {itemLabel}
             {itemCount > 1 ? "s" : ""}
           </Badge>
-          {isDirection && onDelete && canDelete && (
+          {isDirection && onDelete && (
             <Button
               variant="ghost"
               size="sm"
@@ -75,7 +75,12 @@ export function TreeCategoryHeader({
                 onDelete();
               }}
               className="text-red-400 hover:text-red-300 hover:bg-red-500/20 h-6 w-6 p-0"
-              title={`Supprimer la direction "${category}" et toutes ses équipes`}
+              disabled={!canDelete}
+              title={
+                canDelete
+                  ? `Supprimer la direction "${category}" et toutes ses équipes`
+                  : `Impossible de supprimer la direction "${category}" car elle contient des membres`
+              }
             >
               <Trash2 className="w-3 h-3" />
             </Button>