migrate pure-logic tests to vitest (phase 1)

__tests__/lib/email.test.ts

@@ -1,4 +1,3 @@
-import {describe, expect, it} from '@jest/globals'
 import tldts from 'tldts'
 
 import {isEmailMaybeInvalid} from '#/lib/strings/email'

__tests__/lib/strings/url-helpers.test.ts

@@ -1,5 +1,3 @@
-import {describe, expect, it} from '@jest/globals'
-
 import {
   getChatInviteCodeFromUrl,
   isPossiblyAUrl,