app: Bring back push mode
app: Bring back push mode

This reverts commit 75fdf32d33ebe17a03fda294e60e676e5b43e975.

cozy-labs/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop