Like the "From this node to the previous node with a defined radius" mode, but interpolates radii for intermediate nodes by distance, just like how virtual nodes are drawn in the tracing overlay. When rapidly adding radii to existing skeletons, this would produce much smoother and more representative annotations.

Sometimes, one wants to paste a decimal position (e.g., 0.5, 3.3, 4.4) from somewhere into webKnossos which is not supported. However, our internal position is stored as floats, so it would make sense to support this input format. Proposed approach:

• correctly parse float positions
• also jump to that precise float position
• on blur, render the position as integers (as it's done currently