ReactionsDialog: drop email, make rows clickable

[maxphilippov]

• don't show email in reactions dialog unless user has no display name
• clicking on a row in reactions dialog opens a user profile
• resolved remove email address from reaction details & make details tappable #4066

[WofWca]

The "click to open contact" is nice, but I'm not sure if removing the address is good.

[r10s]

but I'm not sure if removing the address is good

tuning down email adresses is an ongoing process and needed for chatmail, this PR and reactions is only one small step in that effort.

for reasoning, see eg. https://delta.chat/en/2024-05-31-instant-onboarding#are-we-de-emphasizing-e-mail-addresses-in-the-user-interface - the approach was recently confirmed several times by user get stuck using email adresses. it is better to push to other ways to get in contact, as using invite links or qr codes. but if user see an email address before, they will try with that and fail :)

[r10s]

• if is better when tapping the "Me" self-reaction just does nothing; opening "Saved messages" is not helpful and is unexpected. on Android, we also just do nothing

• when doing an action from the contact, eg. tap a shared chat or tap "send-message", it is weird that the "reaction" dialog stays opened (cmp corresponding discussion about that in the linked issue)

otherwise, functionalty-wise, this lgtm. thanks a lot for pushing that foward