This commit improves the handling of tabs in the samll deck layout. We
are now saving the selected tabs index in the newly added
"LayoutRepository" so that we can reuse the selected tab when a user
switches between the small and large layout. We can now also set the tab
which should be initially selected in the large layout when a user
selects a column in the navigation rail. Last but not least we can also
reset the initial tab index when a user selects a new deck in the
settings, so that we always display the first column instead of the
column with the same index as it was selected in the previous deck.
This commit fixes the border radius for the drawer used in the large
deck layout. Until now the drawer used the border radius on all edges.
This is now fixed to only use the border radius on the right side of the
drawer. This is more aligned how the border radius is used in the side
sheet for the item details, where we also only use it on the left side.
