Split custom world generation into staged lightweight batches

src/data/equipmentEffects.ts

@@ -1,7 +1,7 @@
 import { Character, EquipmentLoadout, EquipmentSlotId, GameState, InventoryItem, ItemRarity } from '../types';
 import { normalizeBuildRole, normalizeBuildTags } from './buildTags';
 import type { CharacterEquipmentItem } from './characterPresets';
-import { getCharacterEquipment, getCharacterMaxMana } from './characterPresets';
+import { getCharacterEquipment, getCharacterMaxHp, getCharacterMaxMana } from './characterPresets';
 
 export type EquipmentBonuses = {
   maxHpBonus: number;
@@ -285,9 +285,14 @@ export function applyEquipmentLoadoutToState(
   state: GameState,
   nextEquipment: EquipmentLoadout,
 ): GameState {
-  const previousBonuses = getEquipmentBonuses(state.playerEquipment ?? createEmptyEquipmentLoadout());
   const nextBonuses = getEquipmentBonuses(nextEquipment);
-  const baseMaxHp = Math.max(1, state.playerMaxHp - previousBonuses.maxHpBonus);
+  const baseMaxHp = state.playerCharacter
+    ? getCharacterMaxHp(
+        state.playerCharacter,
+        state.worldType,
+        state.customWorldProfile,
+      )
+    : Math.max(1, state.playerMaxHp);
   const nextMaxHp = baseMaxHp + nextBonuses.maxHpBonus;
   const nextMaxMana = state.playerCharacter ? getCharacterMaxMana(state.playerCharacter) : state.playerMaxMana;