Ignagduk: Freeze/CC blocked during intro & phase transitions

During the fight with Ignagduk the Bog Witch, freeze-based mechanics and damage don’t apply during the boss’s intro “charging” animation and phase transitions.

1) Freeze buildup caps at ~25% and cannot trigger full freeze.
2) Damage applied is ignored until the animation ends, then HP drops suddenly.
3) Visual feedback suggests the boss can be affected, but mechanics are temporarily disabled.

It would help if the boss clearly indicated when it’s immune (such as a greyed-out HP bar, an ‘Immune’ tag, or a visual/audio cue) and prevented the freeze buildup from showing during these inactive phases