fix: Don't overlay nav bar on modals

[v-almonacid]

This is probably a temporal solution because a good fix involves re-structuring the layout and/or the navigation hierarchy.

For now it's totally fine (and maybe even the right way) to display "modal" pages over the whole screen.

[Xavier-Charles]

I think the right solution would be to use the PagedMobilleLayout component instead of MobileLayout for the UserFilters and also setup the routing so that its a page. It's a quick change.

Removing the zIndex may have some unprecedented effects

[v-almonacid]

I think the right solution would be to use the PagedMobilleLayout component instead of MobileLayout for the UserFilters and also setup the routing so that its a page. It's a quick change.

Removing the zIndex may have some unprecedented effects

I disagree. The bottom navigation bar shouldn't be force displayed on top of the the rest of the content.
You are right in that a correct fix should be done using a good layout. But even the "paged layout" isn't a proper solution. We shouldn't handle manually "back" events for instance. That should be handled by the navigation stack which is what I'm exploring in #242.