Replace Adw.Squeezer with Adw.Breakpoint to switch to the small view mode

[Diego-Ivan]

Since AdwSqueezer will be deprecated in the next major release of Libadwaita, we have to migrate to the new AdwBreakpoint API, which does not seem very complicated and I think it will simplify how the current implementation works.

https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/migrating-to-breakpoints.html#replace-adwsqueezer