실시간 차트 우측 상단 주가, 등락율 현재가로 반영

frontend/src/App.css

@@ -569,6 +569,12 @@ html.theme-blue {
 }
 
 .upbit-market  { font-weight: 700; color: var(--text); }
+.upbit-quote-group {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-shrink: 0;
+}
 .upbit-price   { font-weight: 700; font-size: 13px; }
 .upbit-change.up   { color: var(--up); font-weight: 600; }
 .upbit-change.down { color: var(--down); font-weight: 600; }
@@ -844,14 +850,44 @@ html.theme-blue {
   position: absolute;
   top: 6px;
   left: 8px;
+  right: 8px;
   z-index: 10;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  gap: 4px;
+  pointer-events: none;
+  font-size: 12px;
+}
+.tv-legend-top {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  width: 100%;
+  min-width: 0;
+}
+.tv-legend-meta {
   display: flex;
   align-items: center;
   flex-wrap: wrap;
   gap: 6px;
-  pointer-events: none;
-  font-size: 12px;
-  max-width: calc(100% - 80px);
+  min-width: 0;
+}
+.tv-legend-quote {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-shrink: 0;
+  font-weight: 700;
+}
+.tv-legend-quote-price { font-size: 13px; }
+.tv-legend-quote-chg { font-size: 12px; font-weight: 600; }
+.tv-legend-bottom {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 6px;
+  max-width: calc(100% - 72px);
 }
 .tv-legend-sym {
   display: flex;

frontend/src/App.tsx

@@ -100,6 +100,11 @@ import VerificationBoardPage from './components/VerificationBoardPage';
 import DashboardPage from './components/DashboardPage';
 import { loadPaperSummary, resetPaperAccount, loadActiveLiveStrategySettings, expandLiveStrategySubscriptions } from './utils/backendApi';
 import ChartLegendBar from './components/ChartLegendBar';
+import {
+  formatChartLiveChangePct,
+  formatChartLivePrice,
+  resolveChartLiveQuote,
+} from './utils/chartLiveQuote';
 import RightSidePanel from './components/RightSidePanel';
 import {
   type BacktestSettingsDto,
@@ -1655,12 +1660,12 @@ function App() {
     : (bars.length > 0 ? bars[bars.length - 1] : null);
   /** 크로스헤어 OHLC·지표 범례 */
   const hoverBar = legend ?? lastKnownBar;
-  /** 종목명 옆 시세 — 실시간 현재가만 */
+  /** 종목명 옆·우측 상단 시세 — 실시간 티커/최신 봉 (크로스헤어 무관) */
   const quoteBar = lastKnownBar;
-  const isUp = quoteBar ? quoteBar.close >= quoteBar.open : true;
-  const prevClose = bars.length > 1 ? bars[bars.length - 2].close : quoteBar?.open ?? 0;
-  const dailyChange    = quoteBar ? quoteBar.close - prevClose : 0;
-  const dailyChangePct = prevClose > 0 ? dailyChange / prevClose * 100 : 0;
+  const liveQuote = useMemo(
+    () => resolveChartLiveQuote(chartTicker, quoteBar, bars),
+    [chartTicker, quoteBar, bars],
+  );
 
   const openNotificationsPage = useCallback(() => guardedSetMenuPage('notifications'), [guardedSetMenuPage]);
 
@@ -2074,15 +2079,20 @@ function App() {
           <span className="upbit-market">{getKoreanName(symbol)} <span style={{opacity:0.5, fontSize:'11px'}}>{symbol}</span></span>
           {isLoading && <span className="upbit-loading">데이터 로딩 중...</span>}
           {error && <span className="upbit-error">⚠ {error}</span>}
-          {!isLoading && !error && quoteBar && (
-            <>
-              <span className="upbit-price" style={{ color: isUp ? 'var(--up)' : 'var(--down)' }}>
-                {quoteBar.close.toLocaleString()} KRW
+          {!isLoading && !error && liveQuote.price != null && (
+            <div className="upbit-quote-group">
+              <span
+                className="upbit-price"
+                style={{ color: liveQuote.isUp ? 'var(--up)' : 'var(--down)' }}
+              >
+                {formatChartLivePrice(liveQuote.price)}
               </span>
-              <span className={`upbit-change ${isUp ? 'up' : 'down'}`}>
-                {isUp ? '▲' : '▼'} {Math.abs(dailyChangePct).toFixed(2)}%
-              </span>
-            </>
+              {liveQuote.changePct != null && (
+                <span className={`upbit-change ${liveQuote.isUp ? 'up' : 'down'}`}>
+                  {formatChartLiveChangePct(liveQuote.changePct)}
+                </span>
+              )}
+            </div>
           )}
           <span className="upbit-hint">💡 업비트 마켓: KRW-BTC, KRW-ETH, KRW-XRP ...</span>
         </div>
@@ -2196,6 +2206,7 @@ function App() {
                 chartLiveReceiveHighlight={chartLiveReceiveHighlight}
                 chartRealtimeSource={chartRealtimeSource as 'BACKEND_STOMP' | 'UPBIT_DIRECT'}
                 displayTimezone={displayTimezone}
+                marketTickers={marketTickers}
                 compactMode
                 chartVisible={chartVisible}
               />
@@ -2235,6 +2246,7 @@ function App() {
                     chartLiveReceiveHighlight={chartLiveReceiveHighlight}
                     chartRealtimeSource={chartRealtimeSource as 'BACKEND_STOMP' | 'UPBIT_DIRECT'}
                     displayTimezone={displayTimezone}
+                    marketTickers={marketTickers}
                     compactMode
                     chartVisible={chartVisible}
                   />
@@ -2253,10 +2265,7 @@ function App() {
             wsStatus={wsStatus}
             mode={mode}
             currentBar={hoverBar}
-            quoteBar={quoteBar}
-            isUp={isUp}
-            dailyChange={dailyChange}
-            dailyChangePct={dailyChangePct}
+            liveQuote={liveQuote}
             indicators={indicators}
             legend={legend}
           />
@@ -2626,7 +2635,7 @@ function App() {
       )}
       {showAlert && (
         <AlertManager
-          alerts={alerts} currentPrice={quoteBar?.close ?? 0}
+          alerts={alerts} currentPrice={liveQuote.price ?? quoteBar?.close ?? 0}
           onAdd={(price, label) => { managerRef.current?.addAlert(price, label); setAlerts(prev => [...prev, { price, label }]); }}
           onRemove={price => { managerRef.current?.removeAlert(price); setAlerts(prev => prev.filter(a => Math.abs(a.price - price) > 0.0001)); }}
           onClose={() => setShowAlert(false)}

frontend/src/components/ChartLegendBar.tsx

@@ -6,6 +6,11 @@ import type { WsStatus } from '../hooks/useUpbitData';
 import type { ChartMode, IndicatorConfig, LegendData } from '../types';
 import type { ChartLegendVisibility } from '../types/chartLegend';
 import { formatPrice } from '../utils/dataGenerator';
+import {
+  formatChartLiveChangePct,
+  formatChartLivePrice,
+  type ChartLiveQuote,
+} from '../utils/chartLiveQuote';
 import { getIndicatorDef, getIndicatorChartTitle } from '../utils/indicatorRegistry';
 import { formatBbLegendLabel } from '../utils/bollingerConfig';
 
@@ -28,13 +33,10 @@ export interface ChartLegendBarProps {
   useUpbit: boolean;
   wsStatus: WsStatus;
   mode: ChartMode;
-  /** 크로스헤어·OHLC 범례용 (없으면 quoteBar) */
+  /** 크로스헤어 OHLC·지표 값 */
   currentBar: LegendData | null;
-  /** 종목명 옆 시세·등락 — 실시간 현재가만 (크로스헤어 미반영) */
-  quoteBar?: LegendData | null;
-  isUp: boolean;
-  dailyChange: number;
-  dailyChangePct: number;
+  /** 우측 현재가·등락 (티커/최신 봉, 크로스헤어 무관) */
+  liveQuote: ChartLiveQuote;
   indicators: IndicatorConfig[];
   legend: LegendData | null;
 }
@@ -46,86 +48,107 @@ export const ChartLegendBar: React.FC<ChartLegendBarProps> = ({
   useUpbit,
   wsStatus,
   mode,
-  currentBar,
-  quoteBar: quoteBarProp,
-  isUp,
-  dailyChange,
-  dailyChangePct,
+  currentBar: ohlcBar,
+  liveQuote,
   indicators,
   legend,
 }) => {
-  const ohlcBar = currentBar;
-  const quoteBar = quoteBarProp ?? currentBar;
-  const showOhlc = ohlcBar && (v.open || v.high || v.low || v.close || v.change);
+  const ohlcUp = ohlcBar ? ohlcBar.close >= ohlcBar.open : true;
+  const showOhlc = ohlcBar && (v.open || v.high || v.low || v.close);
+  const showLiveQuote = (v.close || v.change) && liveQuote.price != null;
   const showAny =
     v.symbol || v.timeframe || (useUpbit && v.liveStatus) || (mode === 'trading' && v.tradingBadge)
-    || showOhlc || (v.indicators && indicators.length > 0);
+    || showLiveQuote || showOhlc || (v.indicators && indicators.length > 0);
 
   if (!showAny) return null;
 
   return (
     <div className="tv-legend">
-      {v.symbol && (
-        <span className="tv-legend-sym">
-          <span className="tv-legend-dot" style={{ background: isUp ? 'var(--up)' : 'var(--down)' }} />
-          {symbol}
-        </span>
-      )}
-      {v.timeframe && <span className="tv-legend-tf">· {timeframe}</span>}
-      {useUpbit && v.liveStatus && <WsBadge status={wsStatus} isUpbit={true} />}
-      {mode === 'trading' && v.tradingBadge && <span className="tv-legend-badge trading">✏</span>}
-      {showOhlc && (
-        <span className="tv-legend-ohlcv">
-          {v.open && ohlcBar && (
-            <span>O <b className={isUp ? 'up' : 'down'}>{formatPrice(ohlcBar.open)}</b></span>
-          )}
-          {v.high && ohlcBar && (
-            <span>H <b className="up">{formatPrice(ohlcBar.high)}</b></span>
-          )}
-          {v.low && ohlcBar && (
-            <span>L <b className="down">{formatPrice(ohlcBar.low)}</b></span>
-          )}
-          {v.close && quoteBar && (
-            <span>C <b className={isUp ? 'up' : 'down'}>{formatPrice(quoteBar.close)}</b></span>
-          )}
-          {v.change && (
-            <span className={`tv-legend-chg ${isUp ? 'up' : 'down'}`}>
-              {isUp ? '▲' : '▼'} {formatPrice(Math.abs(dailyChange))} ({Math.abs(dailyChangePct).toFixed(2)}%)
+      <div className="tv-legend-top">
+        <div className="tv-legend-meta">
+          {useUpbit && v.liveStatus && <WsBadge status={wsStatus} isUpbit={true} />}
+          {v.symbol && (
+            <span className="tv-legend-sym">
+              <span
+                className="tv-legend-dot"
+                style={{ background: liveQuote.isUp ? 'var(--up)' : 'var(--down)' }}
+              />
+              {symbol}
             </span>
           )}
-        </span>
-      )}
-      {v.indicators && indicators.map(ind => {
-        const def = getIndicatorDef(ind.type);
-        const vals = legend?.indicatorValues?.[ind.type];
-        const plots = ind.plots ?? def?.plots ?? [];
-        const label = ind.type === 'BollingerBands'
-          ? formatBbLegendLabel(ind.params ?? {})
-          : getIndicatorChartTitle(ind.type);
-        const fmtVal = (n: number) =>
-          Math.abs(n) >= 1000
-            ? n.toLocaleString('ko-KR', { maximumFractionDigits: 1 })
-            : n.toFixed(2);
-        return def ? (
-          <span key={ind.id} className="tv-legend-ind">
-            <span className="tv-legend-ind-name">{label}</span>
-            {v.indicatorValues && vals && vals.length > 0 && (
-              <span className="tv-legend-ind-vals">
-                {vals.map((n, i) =>
-                  Number.isFinite(n) ? (
-                    <b
-                      key={i}
-                      style={{ color: (plots[i]?.color ?? def.plots?.[i]?.color ?? '#42A5F5').slice(0, 7) }}
-                    >
-                      {fmtVal(n)}
-                    </b>
-                  ) : null,
+          {showLiveQuote && (
+            <div className="tv-legend-quote" aria-label="실시간 현재가">
+              {v.close && (
+                <span className={`tv-legend-quote-price ${liveQuote.isUp ? 'up' : 'down'}`}>
+                  {formatChartLivePrice(liveQuote.price)}
+                </span>
+              )}
+              {v.change && liveQuote.changePct != null && (
+                <span className={`tv-legend-quote-chg ${liveQuote.isUp ? 'up' : 'down'}`}>
+                  {formatChartLiveChangePct(liveQuote.changePct)}
+                </span>
+              )}
+            </div>
+          )}
+          {v.timeframe && <span className="tv-legend-tf">· {timeframe}</span>}
+          {mode === 'trading' && v.tradingBadge && (
+            <span className="tv-legend-badge trading">✏</span>
+          )}
+        </div>
+      </div>
+      {(showOhlc || (v.indicators && indicators.length > 0)) && (
+        <div className="tv-legend-bottom">
+          {showOhlc && (
+            <span className="tv-legend-ohlcv">
+              {v.open && (
+                <span>O <b className={ohlcUp ? 'up' : 'down'}>{formatPrice(ohlcBar!.open)}</b></span>
+              )}
+              {v.high && (
+                <span>H <b className="up">{formatPrice(ohlcBar!.high)}</b></span>
+              )}
+              {v.low && (
+                <span>L <b className="down">{formatPrice(ohlcBar!.low)}</b></span>
+              )}
+              {v.close && (
+                <span>C <b className={ohlcUp ? 'up' : 'down'}>{formatPrice(ohlcBar!.close)}</b></span>
+              )}
+            </span>
+          )}
+          {v.indicators && indicators.map(ind => {
+            const def = getIndicatorDef(ind.type);
+            const vals = legend?.indicatorValues?.[ind.type];
+            const plots = ind.plots ?? def?.plots ?? [];
+            const label = ind.type === 'BollingerBands'
+              ? formatBbLegendLabel(ind.params ?? {})
+              : getIndicatorChartTitle(ind.type);
+            const fmtVal = (n: number) =>
+              Math.abs(n) >= 1000
+                ? n.toLocaleString('ko-KR', { maximumFractionDigits: 1 })
+                : n.toFixed(2);
+            return def ? (
+              <span key={ind.id} className="tv-legend-ind">
+                <span className="tv-legend-ind-name">{label}</span>
+                {v.indicatorValues && vals && vals.length > 0 && (
+                  <span className="tv-legend-ind-vals">
+                    {vals.map((n, i) =>
+                      Number.isFinite(n) ? (
+                        <b
+                          key={i}
+                          style={{
+                            color: (plots[i]?.color ?? def.plots?.[i]?.color ?? '#42A5F5').slice(0, 7),
+                          }}
+                        >
+                          {fmtVal(n)}
+                        </b>
+                      ) : null,
+                    )}
+                  </span>
                 )}
               </span>
-            )}
-          </span>
-        ) : null;
-      })}
+            ) : null;
+          })}
+        </div>
+      )}
     </div>
   );
 };

frontend/src/components/ChartSlot.tsx

@@ -14,6 +14,12 @@ import MainChartSettingsModal from './MainChartSettingsModal';
 import { MarketSearchPanel } from './MarketSearchPanel';
 import { generateBars, formatPrice } from '../utils/dataGenerator';
 import { getKoreanName } from '../utils/marketNameCache';
+import type { TickerData } from '../hooks/useMarketTicker';
+import {
+  formatChartLiveChangePct,
+  formatChartLivePrice,
+  resolveChartLiveQuote,
+} from '../utils/chartLiveQuote';
 import { DEFAULT_MAIN_CHART_STYLE } from '../utils/storage';
 import { enrichIndicatorConfig, getIndicatorDef } from '../utils/indicatorRegistry';
 import { normalizeSmaConfig, createDefaultSmaPlotVisibility } from '../utils/smaConfig';
@@ -180,6 +186,8 @@ export interface ChartSlotProps {
   chartVisible?: boolean;
   /** pane 구분선 */
   chartPaneSeparator?: ChartPaneSeparatorOptions;
+  /** 업비트 실시간 티커 맵 (슬롯 심볼별 현재가·등락) */
+  marketTickers?: Map<string, TickerData>;
 }
 
 const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot({
@@ -204,6 +212,7 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
   chartLiveReceiveHighlight = true,
   chartVisible = true,
   chartPaneSeparator,
+  marketTickers,
 }, ref) {
   // ── 전역 지표 파라미터 + 시각 설정 (DB 동기화) ────────────────────────
   const { getParams, saveParams, getVisualConfig, saveVisual } = useIndicatorSettings();
@@ -557,10 +566,11 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
     ? (latestBar ?? (bars.length > 0 ? bars[bars.length - 1] : null))
     : (bars.length > 0 ? bars[bars.length - 1] : null);
   const quoteBar = lastKnownBar;
-  const isUp = quoteBar ? quoteBar.close >= quoteBar.open : true;
-  const prevClose = bars.length > 1 ? bars[bars.length - 2].close : quoteBar?.open ?? 0;
-  const dailyChange    = quoteBar ? quoteBar.close - prevClose : 0;
-  const dailyChangePct = prevClose > 0 ? dailyChange / prevClose * 100 : 0;
+  const slotTicker = marketTickers?.get(symbol) ?? null;
+  const liveQuote = useMemo(
+    () => resolveChartLiveQuote(slotTicker, quoteBar, bars),
+    [slotTicker, quoteBar, bars],
+  );
 
   const receiveSignal = useMemo(() => {
     if (!useUpbit || wsStatus !== 'connected' || !latestBar) return null;
@@ -671,8 +681,8 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
   }, [compactMode, onActivate, showMarket]);
 
   const displayKoName = compactKoName(symbol);
-  const trendUp = compactMode && quoteBar != null && dailyChangePct >= 0;
-  const trendDown = compactMode && quoteBar != null && dailyChangePct < 0;
+  const trendUp = compactMode && liveQuote.price != null && liveQuote.isUp;
+  const trendDown = compactMode && liveQuote.price != null && !liveQuote.isUp;
 
   return (
     <div
@@ -708,20 +718,22 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
               <span className="slot-compact-name-text">{displayKoName}</span>
             </button>
 
-            {quoteBar && (
+            {liveQuote.price != null && (
               <div className="slot-compact-quote" aria-label="현재가">
                 <span
                   className="slot-compact-price"
-                  style={{ color: isUp ? 'var(--up)' : 'var(--down)' }}
+                  style={{ color: liveQuote.isUp ? 'var(--up)' : 'var(--down)' }}
                 >
-                  {formatPrice(quoteBar.close)}
-                </span>
-                <span
-                  className="slot-compact-change"
-                  style={{ color: isUp ? 'var(--up)' : 'var(--down)' }}
-                >
-                  {isUp ? '+' : '-'}{Math.abs(dailyChangePct).toFixed(2)}%
+                  {formatChartLivePrice(liveQuote.price).replace(' KRW', '')}
                 </span>
+                {liveQuote.changePct != null && (
+                  <span
+                    className="slot-compact-change"
+                    style={{ color: liveQuote.isUp ? 'var(--up)' : 'var(--down)' }}
+                  >
+                    {formatChartLiveChangePct(liveQuote.changePct)}
+                  </span>
+                )}
               </div>
             )}
 
@@ -772,12 +784,14 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
                 </button>
               ))}
             </div>
-            {quoteBar && (
-              <span className="slot-price" style={{ color: isUp ? 'var(--up)' : 'var(--down)' }}>
-                {formatPrice(quoteBar.close)}
-                <span className="slot-change" style={{ color: isUp ? 'var(--up)' : 'var(--down)' }}>
-                  {isUp ? '▲' : '▼'} {Math.abs(dailyChangePct).toFixed(2)}%
-                </span>
+            {liveQuote.price != null && (
+              <span className="slot-price" style={{ color: liveQuote.isUp ? 'var(--up)' : 'var(--down)' }}>
+                {formatChartLivePrice(liveQuote.price).replace(' KRW', '')}
+                {liveQuote.changePct != null && (
+                  <span className="slot-change" style={{ color: liveQuote.isUp ? 'var(--up)' : 'var(--down)' }}>
+                    {formatChartLiveChangePct(liveQuote.changePct)}
+                  </span>
+                )}
               </span>
             )}
             {useUpbit && <WsBadge status={wsStatus} isUpbit={true} />}

frontend/src/types/chartLegend.ts

@@ -55,11 +55,11 @@ export const CHART_LEGEND_SETTING_ITEMS: {
   { key: 'timeframe', label: '타임프레임', desc: '현재 차트 주기(5m, 1D 등)를 표시합니다.' },
   { key: 'liveStatus', label: '실시간 상태', desc: '업비트 WebSocket 연결 상태(실시간·재연결 등)를 표시합니다.' },
   { key: 'tradingBadge', label: '매매 모드', desc: '매매(그리기) 모드일 때 편집 배지를 표시합니다.' },
-  { key: 'open', label: '시가 (O)', desc: '현재(또는 크로스헤어) 봉의 시가를 표시합니다.' },
-  { key: 'high', label: '고가 (H)', desc: '현재(또는 크로스헤어) 봉의 고가를 표시합니다.' },
-  { key: 'low', label: '저가 (L)', desc: '현재(또는 크로스헤어) 봉의 저가를 표시합니다.' },
-  { key: 'close', label: '종가 (C)', desc: '현재(또는 크로스헤어) 봉의 종가를 표시합니다.' },
-  { key: 'change', label: '변동', desc: '전봉 대비 변동 금액과 비율을 표시합니다.' },
+  { key: 'open', label: '시가 (O)', desc: '크로스헤어 위치 봉의 시가를 표시합니다.' },
+  { key: 'high', label: '고가 (H)', desc: '크로스헤어 위치 봉의 고가를 표시합니다.' },
+  { key: 'low', label: '저가 (L)', desc: '크로스헤어 위치 봉의 저가를 표시합니다.' },
+  { key: 'close', label: '현재가', desc: '차트 우측 상단 실시간 현재가(업비트 티커)를 표시합니다. 크로스헤어와 무관합니다.' },
+  { key: 'change', label: '등락률', desc: '전일 대비 등락률(%)을 현재가 옆에 표시합니다. 크로스헤어와 무관합니다.' },
   { key: 'indicators', label: '보조지표 이름', desc: '차트에 적용된 보조지표 이름 뱃지를 표시합니다.' },
   { key: 'indicatorValues', label: '보조지표 값', desc: '보조지표 이름 옆에 현재 수치를 표시합니다.' },
 ];

frontend/src/utils/chartLiveQuote.ts

@@ -0,0 +1,51 @@
+/**
+ * 실시간 차트 상단·우측 현재가·등락률 (크로스헤어와 분리, 업비트 티커 우선)
+ */
+import type { TickerData } from '../hooks/useMarketTicker';
+import type { OHLCVBar } from '../types';
+
+export interface ChartLiveQuote {
+  price: number | null;
+  /** 전일 대비 등락률 (%) */
+  changePct: number | null;
+  isUp: boolean;
+}
+
+export function resolveChartLiveQuote(
+  ticker: TickerData | undefined | null,
+  lastBar: OHLCVBar | null,
+  bars: OHLCVBar[],
+): ChartLiveQuote {
+  const price =
+    ticker?.tradePrice != null && Number.isFinite(ticker.tradePrice)
+      ? ticker.tradePrice
+      : lastBar?.close ?? null;
+
+  if (ticker?.changeRate != null && Number.isFinite(ticker.changeRate)) {
+    const changePct = ticker.changeRate * 100;
+    return { price, changePct, isUp: ticker.changeRate >= 0 };
+  }
+
+  if (lastBar && bars.length > 1) {
+    const prevClose = bars[bars.length - 2].close;
+    if (prevClose > 0) {
+      const ch = lastBar.close - prevClose;
+      const changePct = (ch / prevClose) * 100;
+      return { price, changePct, isUp: ch >= 0 };
+    }
+  }
+
+  const isUp = lastBar ? lastBar.close >= lastBar.open : true;
+  return { price, changePct: null, isUp };
+}
+
+export function formatChartLivePrice(price: number | null): string {
+  if (price == null || !Number.isFinite(price)) return '—';
+  return `${Math.round(price).toLocaleString('ko-KR')} KRW`;
+}
+
+export function formatChartLiveChangePct(changePct: number | null): string {
+  if (changePct == null || !Number.isFinite(changePct)) return '';
+  const up = changePct >= 0;
+  return `${up ? '▲' : '▼'} ${Math.abs(changePct).toFixed(2)}%`;
+}