Login screen: provide a Super Cow image for the .../admin page

[WordsOfMe]

Summary

I don't know how many times I have now entered my mailbox credentials at the .../admin page and my admin credentials at the standard login screen.

I think having separate login forms is basically a good idea, but IMHO they look to similar. Maybe the iconic cow could be changed into a mailcow Super Cow for the .../admin page, so you could see at a glance which login form you are currently using.

Motivation

Assuming 50.000 mailcow installations globally and each administrator losing 10 seconds per day for using the wrong login form, at an hourly rate of EUR 50 only we are at 139 hours of lost lifetime or EUR 6940 (USD 7810) in net loss - per year! ;-)

Additional context

No response

[mrclschstr]

For example (created with ChatGPT):

[FreddleSpl0it]

Quicklinks will show below the login forms in the next update.
You can hide them via UI customization. Hope that clears it up!

#6521