Adjust the stack count of a stackable active effect.
Clamps the result to [0, maxStacks] and updates the effect document.
Handles both actor-owned and party-held (via partyEffectLink) effects.
This is a shared helper used by both the actor sheet's quick controls
and the party sheet for per-member stack adjustments.
Parameters
actor: Actor
The actor that owns the effect or a partyEffectLink pointing to it
effectId: string
The ID of the stackable effect to adjust
delta: number
The change in stack count (can be positive or negative)
Adjust the stack count of a stackable active effect. Clamps the result to [0, maxStacks] and updates the effect document. Handles both actor-owned and party-held (via partyEffectLink) effects.
This is a shared helper used by both the actor sheet's quick controls and the party sheet for per-member stack adjustments.