fix: imports inutilisés frontend (useEffect, CombatResult)

frontend/src/api/endpoints.ts

@@ -1,6 +1,6 @@
 import { api } from './client';
 import type {
-  User, Character, Monster, CombatResult, CombatLog,
+  User, Character, Monster, CombatLog,
   CharacterItem, CharacterMaterial, Recipe, CraftJob, Item,
 } from './types';
 

frontend/src/pages/CombatPage.tsx

@@ -1,4 +1,4 @@
-import { useState, useEffect, useCallback } from 'react';
+import { useState, useCallback } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { combatApi, characterApi } from '../api/endpoints';
 import type { Monster, CombatResult, MultiCombatResult, CombatLog } from '../api/types';