*: pos_hr_restaurant, pos_restaurant
In #108891 the navbar was extracted out of the Chrome and into its own
components, but when a temp screen is shown, an overlay is placed over
the navbar to prevent the user from using it to navigate away as this
can break some flows, and the overlay was not moved inside the navbar.
This caused the overlay to go over the entire Chrome which was not the
goal.
This commit moves the block-header overlay into the navbar (and adapts
some code to make the tempScreen state accessible inside the navbar).
closesodoo/odoo#109456
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>