[Panel] Login button improvements

[jenstornell]

I think the login button can be improved.

• It has a really strong icon and a much weaker text. I don't feel the balance between them.
• It's a bit too much space between the icon and the text.
• I perfer to have it positioned to the right.
• It looks more like a link than a button and I miss the edges in this case.

It may not need to look like a traditional button, but with some enhancements, I think it would look more like a solid action than it does now.

[bastianallgeier]

✅ at least part of it is implemented now :)