Drawing annotations on 1 bp nodes misses the node itself

Annotating 1bp nodes with blast hits colours past the node, potentially some off-by-one type of error. The blue area on both 1bp nodes is not selectable, because there is no node underneath them annotation on <img width="603" height="428" alt="Image" src="https://github.com/user-attachments/assets/da44756c-ffbe-4bd9-90c1-a7c3adb9ca65" /> annotation off <img width="603" height="428" alt="Image" src="https://github.com/user-attachments/assets/b7af662d-43d8-48f8-b3c9-23643e393e46" />