Various fixes

[NicoPennec]

Problem

• In video game productions, you can create assets without chapters, but it is required.
• On the People page, after updating the email with an invalid domain, the user form does not reset.
• Users don't always know how to close the full-screen preview modal.
• Some npm dependencies are outdated.

Solution

• Fix episode selection in the asset form.
• Fix email error handling in the user form on the People page.
• Add a close button and improve UX on the full-screen preview modal.
• Bump npm dependencies.