nice, thanks for asking.
i like the filter + sort toolbar addition as a separate improvement regardless of the starred feature… please do this no matter what.
stars on left look more natural than having the stars next to trashcan just seems like bad juxtaposition.
the loss of screen real estate is what concerns me, so my suggestion is that both the tab area and the stars display on the left should be toggles .
both off
minimalist and least disrupting configuration with access to the starred feature
filter + sort are available for finding starred items and to mark the star it would appear on the hover tool bar, perhaps to the left of the actions tool instead of next to the trash can.
tabs only
here you can quickly switch to viewing only the starred items while still having access to filter + sort and the hover tool bar for marking
stars only
here you would be able to see and mark the starred items directly while still having access to filter + sort, the star would not show in the hover tool bar.
both on
the full show with both stars on the left for marking as well as tabs for easier access while still having access to the filter + sort.