Fix focus traps in dialogs

[fynnfeldpausch]

Catalyst components often don't really work well with the focus trap of Angular CDK. This comes down to the focus management of the custom web components in general.

The idea is to properly implement focus delegation for buttons, which should fix the issue. A first spike can be found at https://github.com/haiilo/catalyst/tree/spike/focus. Additional components need to be aligned the same (or a similar) way.