shell: Fold home screen when a new toplevel appears

Closes #154
5 jobs for fold-home-on-new-toplevel in 5 minutes and 59 seconds
latest
Status Job ID Name Coverage
  Build
passed #136972
librem5
build:native

00:01:31

 
  Test
passed #136974
librem5
test:smoke:one-output

00:02:25

passed #136975
librem5
test:smoke:two-outputs

00:02:25

passed #136973
librem5
unit-test:native

00:01:31

6.0%
 
  Package
passed #136976
librem5
package:deb

00:01:44