Is your feature request related to a problem? Please describe.

As a Nextcloud Mail user I want to quickly open the (single) attachment of an email. E.g. see the attached PDF for an invoice.

Describe the solution you'd like

Show the attachment name in the thread list and make it clickable.

Describe alternatives you've considered

N/a

Work packages

• feat: provide attachement names for messages #11596
• feat: thread attachement list front end #11608

Follow-ups

• feat: store envelopes as list of threads #11529

Additional context

N/a