Handler shape for arc-rotate camera interactions. Property names are the canonical interaction type strings used in inputMap entries. All handlers are plain functions since none need multi-method lifecycle.
Pan by pre-scaled pixel deltas
Orbit by pre-scaled pixel deltas
Zoom by a pre-computed delta (already scaled by input)
Handler shape for arc-rotate camera interactions. Property names are the canonical interaction type strings used in inputMap entries. All handlers are plain functions since none need multi-method lifecycle.