Block inserter button overlaps with UI

[twstokes]

1. Start a new note
2. Add enough text / blocks to enable scrolling
3. Make sure the button inserter is shown on an empty space
4. Scroll the contents upward
5. Observe that the inserter button overlaps the toolbar + nav bar

Blocknotes v1.2 / iPhone 12 / iOS 17.4.1

inserter_overlap.mp4