### What?
After clicking "Select all" `toggleAll(true)`, manually deselecting an
item does not update the overall selection status.
The bulk actions remain visible, and `selectAll` incorrectly stays as
`AllAvailable`.
### How?
Updated `setSelection()` logic to adjust `selectAll` when deselecting an
item if it was previously set to `AllAvailable`.
This ensures that the selection state updates correctly without altering
the effect logic.
`selectAll` switches to Some when an item is deselected after selecting
all.
Bulk actions now hide correctly if no items are selected.
Fixes#10836
5817b81289