chore: Refactor tests to use findBy queries for better async handling, update mock implementations, and clean up imports across various test files. Adjust toast utility to use for-of loops for callback execution. Update Vite and Vitest configuration files for consistency.

frontend/src/api/dnsDetection.ts

@@ -1,4 +1,5 @@
 import client from './client'
+
 import type { DNSProvider } from './dnsProviders'
 
 /** DNS provider detection result */