Add signature when replying to an email

[mityax]

Is your feature request related to a problem? Please describe.
In the mobile app (as far as I can see), it's impossible to append the configured email signature when replying to email threads – that means we always have to resort to the web interface to reply to support emails, which effectively diminishes Chatwoot's usefulness for us extremely.

Describe the solution you'd like
Adjust the message sending UI to make it possible to add the configured email signature with the press of a button, and optionally enable email signature by default for all email conversations.

Describe alternatives you've considered
Always switching to the web interface, which is annoying and therefore slows down our response time.

[linear]

CW-4053 Add signature when replying to an email