bug: placing box annotation in 3D moves the second point while placing without moving the cursor

Example [link](https://neuroglancer-demo.appspot.com/#!%7B%22dimensions%22:%7B%22x%22:%5B4e-9%2C%22m%22%5D%2C%22y%22:%5B4e-9%2C%22m%22%5D%2C%22z%22:%5B4e-8%2C%22m%22%5D%7D%2C%22position%22:%5B80889.1328125%2C78199.9921875%2C4053.3623046875%5D%2C%22crossSectionScale%22:2.1875%2C%22projectionOrientation%22:%5B-0.08939177542924881%2C-0.9848012924194336%2C-0.07470247149467468%2C0.12882165610790253%5D%2C%22projectionScale%22:168016.97613286867%2C%22layers%22:%5B%7B%22type%22:%22image%22%2C%22source%22:%22precomputed://gs://neuroglancer-fafb-data/fafb_v14/fafb_v14_orig%22%2C%22tab%22:%22annotations%22%2C%22volumeRendering%22:%22on%22%2C%22volumeRenderingGain%22:-9%2C%22name%22:%22fafb_v14%22%7D%2C%7B%22type%22:%22annotation%22%2C%22source%22:%7B%22url%22:%22local://annotations%22%2C%22transform%22:%7B%22outputDimensions%22:%7B%22x%22:%5B4e-9%2C%22m%22%5D%2C%22y%22:%5B4e-9%2C%22m%22%5D%2C%22z%22:%5B4e-8%2C%22m%22%5D%7D%7D%7D%2C%22tool%22:%22annotateBoundingBox%22%2C%22tab%22:%22annotations%22%2C%22annotations%22:%5B%7B%22pointA%22:%5B129989.546875%2C60296.55859375%2C1400.4124755859375%5D%2C%22pointB%22:%5B80889.1328125%2C78199.9921875%2C4053.3623046875%5D%2C%22type%22:%22axis_aligned_bounding_box%22%2C%22id%22:%226d0c337534fe96d86a4539e6331a81ebfae477ed%22%7D%5D%2C%22name%22:%22annotation%22%7D%5D%2C%22showAxisLines%22:false%2C%22selectedLayer%22:%7B%22visible%22:true%2C%22layer%22:%22annotation%22%7D%2C%22layout%22:%223d%22%2C%22selection%22:%7B%22layers%22:%7B%22annotation%22:%7B%22annotationId%22:%226d0c337534fe96d86a4539e6331a81ebfae477ed%22%2C%22annotationSource%22:0%2C%22annotationSubsource%22:%22default%22%7D%7D%7D%7D). In the video, the box point updates even when the cursor is still

https://github.com/user-attachments/assets/7a4856a8-a7de-49e1-948c-493f6e96796f