Bug: Dreamwalker takes reduced healing

### Current Behaviour

Dreamwalker takes reduced healing, presumably autobalance reduces NPC healing received to match new hp.

### Expected Behaviour

This reduction should be limited to npc-cast spells, not player spells, as with damaging spells on NPCs.

### Steps to reproduce the problem

cast any heal on dreamwalker

### Extra Notes

_No response_

### AutoBalance Debug Commands

_No response_

### AC rev. hash/commit

n/a

### Operating system

Windows

### Custom changes or Modules

_No response_

Start by reproducing the issue by casting any heal on Dreamwalker, then trace the AutoBalance healing adjustment and compare it with the existing handling for damaging spells on NPCs. Done means player-cast healing is not reduced while NPC-cast healing remains subject to the intended reduction.

Written by the indexing model from the issue text.