fix: Fix group section accordion not working

frontend/src/pages/StrategySettings.tsx

@@ -11,7 +11,7 @@ import {
     getPresetDiff,
 } from '../utils/strategyPresets'
 
-// ── 타입 ──────────────────────────────────────
+// ── 타입 ──────────────────────────────────────────────
 
 interface StrategyConfig {
     id: number
@@ -28,7 +28,7 @@ interface StrategyConfig {
     updated_by: string | null
 }
 
-// ── 그룹 한글 레이블 ────────────────────────────
+// ── 그룹 한글 레이블 ────────────────────────────────────────
 
 const GROUP_LABELS: Record<string, string> = {
     INDICATOR: '기술 지표',
@@ -59,7 +59,7 @@ const CORE_PARAMS = [
     'DAY_TRADE_ENABLED',
 ]
 
-// ── 프리셋 카드 컴포넌트 ────────────────────────────
+// ── 프리셋 카드 컴포넌트 ────────────────────────────────────────
 
 interface PresetCardProps {
     presetKey: PresetKey
@@ -113,7 +113,7 @@ function PresetCard({ presetKey, isSelected, onSelect }: PresetCardProps) {
     )
 }
 
-// ── 개별 파라미터 행 컴포넌트 ────────────────────────
+// ── 개별 파라미터 행 컴포넌트 ────────────────────────────────
 
 interface ConfigRowProps {
     cfg: StrategyConfig
@@ -233,7 +233,7 @@ function ConfigRow({ cfg, onSave, onToggle, onReset, isSaving }: ConfigRowProps)
     )
 }
 
-// ── 그룹 섹션 컴포넌트 ──────────────────────────────
+// ── 그룹 섹션 컴포넌트 ──────────────────────────────────────────────
 
 interface GroupSectionProps {
     groupKey: string
@@ -242,19 +242,33 @@ interface GroupSectionProps {
     onToggle: (key: string) => void
     onReset: (key: string) => void
     isSaving: boolean
-    defaultExpanded?: boolean
+    isExpanded: boolean
+    onToggleExpand: () => void
 }
 
-function GroupSection({ groupKey, configs, onSave, onToggle, onReset, isSaving, defaultExpanded = false }: GroupSectionProps) {
-    const [collapsed, setCollapsed] = useState(!defaultExpanded)
+function GroupSection({ 
+    groupKey, 
+    configs, 
+    onSave, 
+    onToggle, 
+    onReset, 
+    isSaving, 
+    isExpanded,
+    onToggleExpand 
+}: GroupSectionProps) {
     const modifiedCount = configs.filter(c => c.value !== c.default_value).length
 
     return (
         <div>
             {/* 그룹 헤더 */}
             <button
-                onClick={() => setCollapsed(!collapsed)}
-                className="w-full flex items-center justify-between py-2 mb-3 group"
+                onClick={(e) => {
+                    e.preventDefault()
+                    e.stopPropagation()
+                    onToggleExpand()
+                }}
+                type="button"
+                className="w-full flex items-center justify-between py-2 mb-3 group hover:bg-slate-800/30 rounded px-2 transition-colors"
             >
                 <div className="flex items-center gap-2">
                     <span>{GROUP_ICONS[groupKey] || '📁'}</span>
@@ -268,14 +282,14 @@ function GroupSection({ groupKey, configs, onSave, onToggle, onReset, isSaving,
                         </span>
                     )}
                 </div>
-                {collapsed
-                    ? <ChevronRight size={15} className="text-slate-500" />
-                    : <ChevronDown size={15} className="text-slate-500" />
+                {isExpanded
+                    ? <ChevronDown size={15} className="text-slate-500 group-hover:text-slate-300 transition-colors" />
+                    : <ChevronRight size={15} className="text-slate-500 group-hover:text-slate-300 transition-colors" />
                 }
             </button>
 
             {/* 파라미터 카드 그리드 */}
-            {!collapsed && (
+            {isExpanded && (
                 <div className="grid grid-cols-3 gap-2 mb-4">
                     {configs.map((cfg) => (
                         <ConfigRow
@@ -293,18 +307,31 @@ function GroupSection({ groupKey, configs, onSave, onToggle, onReset, isSaving,
     )
 }
 
-// ── 메인 페이지 ──────────────────────────────────────
+// ── 메인 페이지 ──────────────────────────────────────────────────────
 
 const StrategySettings = () => {
     const queryClient = useQueryClient()
     const [notification, setNotification] = useState<{ type: 'success' | 'error'; msg: string } | null>(null)
     const [showPresets, setShowPresets] = useState(true)
+    const [expandedGroups, setExpandedGroups] = useState<Set<string>>(new Set())
 
     const showNotification = (type: 'success' | 'error', msg: string) => {
         setNotification({ type, msg })
         setTimeout(() => setNotification(null), 3000)
     }
 
+    const toggleGroupExpand = (groupKey: string) => {
+        setExpandedGroups(prev => {
+            const next = new Set(prev)
+            if (next.has(groupKey)) {
+                next.delete(groupKey)
+            } else {
+                next.add(groupKey)
+            }
+            return next
+        })
+    }
+
     // 전략 파라미터 목록 조회
     const { data: configs = [], isLoading, refetch } = useQuery<StrategyConfig[]>({
         queryKey: ['strategy-config'],
@@ -558,7 +585,8 @@ const StrategySettings = () => {
                             onToggle={(key) => toggleMutation.mutate(key)}
                             onReset={(key) => resetOneMutation.mutate(key)}
                             isSaving={updateMutation.isPending}
-                            defaultExpanded={false}
+                            isExpanded={expandedGroups.has(groupKey)}
+                            onToggleExpand={() => toggleGroupExpand(groupKey)}
                         />
                     ))}
                 </div>