Fix TypeScript errors

Addresses TypeScript errors related to toast implementation and type definitions.

src/utils/auth/toastUtils.ts

@@ -9,5 +9,9 @@ export const showAuthToast = (
   description: string, 
   variant: 'default' | 'destructive' = 'default'
 ) => {
-  toast({ title, description, variant });
+  toast({ 
+    title, 
+    description, 
+    ...(variant === 'destructive' ? { variant: 'destructive' } : {})
+  });
 };