Split custom world generation into staged lightweight batches

src/hooks/useGameFlow.ts

@@ -3,6 +3,7 @@ import { useEffect, useState } from 'react';
 import {
   buildCustomWorldPlayableCharacters,
   createCharacterSkillCooldowns,
+  getCharacterMaxHp,
   getCharacterMaxMana,
   setRuntimeCharacterOverrides,
 } from '../data/characterPresets';
@@ -16,7 +17,7 @@ import { getScenePreset,getWorldCampScenePreset } from '../data/scenePresets';
 import { AnimationState, Character, CustomWorldProfile, Encounter, GameState, SceneNpc, WorldType } from '../types';
 import type { BottomTab } from '../types/navigation';
 
-const PLAYER_MAX_HP = 180;
+const PLAYER_BASE_MAX_HP = 180;
 
 export type {BottomTab} from '../types/navigation';
 
@@ -71,8 +72,8 @@ function createInitialGameState(): GameState {
     playerActionMode: 'idle',
     scrollWorld: false,
     inBattle: false,
-    playerHp: PLAYER_MAX_HP,
-    playerMaxHp: PLAYER_MAX_HP,
+    playerHp: PLAYER_BASE_MAX_HP,
+    playerMaxHp: PLAYER_BASE_MAX_HP,
     playerMana: 0,
     playerMaxMana: 0,
     playerSkillCooldowns: {},
@@ -165,6 +166,11 @@ export function useGameFlow() {
       ? buildInitialNpcState(initialEncounter, gameState.worldType, gameState)
       : null;
     const initialEquipment = buildInitialEquipmentLoadout(character);
+    const playerMaxHp = getCharacterMaxHp(
+      character,
+      gameState.worldType,
+      gameState.customWorldProfile,
+    );
 
     setGameState(prev =>
       ensureSceneEncounterPreview(
@@ -188,8 +194,8 @@ export function useGameFlow() {
           playerActionMode: 'idle',
           scrollWorld: false,
           inBattle: false,
-          playerHp: PLAYER_MAX_HP,
-          playerMaxHp: PLAYER_MAX_HP,
+          playerHp: playerMaxHp,
+          playerMaxHp: playerMaxHp,
           playerMana: getCharacterMaxMana(character),
           playerMaxMana: getCharacterMaxMana(character),
           playerSkillCooldowns: createCharacterSkillCooldowns(character),