Allow easier profile switching

### Problem I have

I often switch profiles and the fastest way at the moment is to long-tap the profile pic in the header. This gets a bit annoying with time, since that's the least reachable corner on the screen.

### Solution I'd like

Allowing the header (home bar, navigation bar?) to be moved to the bottom of the screen, similar to mobile sites on elk.zone, threads, twitter

### Alternatives considered

Adding a shortcut to switch profiles could also kind of solve this issue. I could then use the "menu bar" option and put it at the bottom.

### Other

_No response_