Healbot

Reduced unnecessary UNIT_HEALTH processing by ignoring unrelated units and repeated health values.
Updated only the affected Healbot health bar when a unit health event is received.
Limited resurrection button refreshes to the affected unit instead of scanning the full party on every health update.
Fixed class detection for the current Chronicles of Arcadia class order.
Restored Healbot skill buttons for valid Priest and Druid class combinations.
Improved Priest secondary handling for Mage, Scout, and Knight combinations.
Preserved existing Healbot behavior while reducing UI workload during party combat.