21. Enhance validation messages for shared email input field on the `Manage List` page.

[rachelspencer]

Summary

Its important that users get the best experience when inputing information into forms. Research some best practices and where/if possible alter the way validation is shown to a user when they're actively typing in an email into the input field on the Manage List page.

Currently the message Please enter a valid email, e.g., example@example.com. is displayed as soon a 1 keystroke is added into the input field. Is this the best way or should the user see a validation message after they submit and the format of their email is not correct. You're research into this should shed some light on this.

Acceptance criteria

• The users experience concerning validation messages when entering an email to share on the Manage List considers best practices
• The validation messages are accessible

Notes:

• Consider using ARIA labels to enhance accessibility of the validation messages