In sidebar, mark which measures are in dataset unit vs voxel space.

[fm3]

It is not always obvious which measures are in multiples of the dataset unit (e.g. nm, µm), and which are in voxels. Should be shown, possibly in a tooltip or just next to the input field.

Examples are particle size, movement speed in the left sidebar in dataset/annotation view, or the coordinates box in the navbar.

Originally suggested in https://github.com/scalableminds/webknossos/issues/8931#issuecomment-3307720058

Related: #8932