Fix email validation to use validator.js

[MantisClone]

Problem

web-components/packages/create-invoice-form/src/lib/invoice/form.svelte

Line 48 in dc9eaf4

const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

Current email regex accepts the following invalid emails:

• <<<>>>@domain.com
• !#$%^&*@domain.com
• user@domain..com
• user@domain...com
• user@dom#ain.com
• user@dom&ain.com
• 😊@domain.com
• user@😊.com

Proposed Solution

Use isEmail from validator.js