fix(B4): show latest bar timestamp in ticker header

web/src/views/HomeView.dom.test.tsx

@@ -110,4 +110,19 @@ describe('TickerHeader', () => {
     await waitFor(() => expect(screen.getAllByText('Apple Inc.').length).toBeGreaterThan(0));
     expect(fetchResearchProfileMock).toHaveBeenCalledTimes(1);
   });
+
+  it('shows the latest chart bar timestamp instead of the render time', async () => {
+    fetchResearchProfileMock.mockResolvedValue({ companyName: 'Apple Inc.' });
+    fetchChartBarsMock.mockResolvedValueOnce([
+      { ts: Date.UTC(2024, 0, 3, 19, 30), open: 210, high: 213, low: 209, close: 212, volume: 1000 },
+      { ts: Date.UTC(2024, 0, 3, 20, 30), open: 212, high: 214, low: 211, close: 213, volume: 1200 },
+    ]);
+
+    renderTickerHeader();
+
+    expect(screen.getByText(/Latest bar pending ET/)).toBeInTheDocument();
+    await waitFor(() => {
+      expect(screen.getByText(/Jan 3, 2024, 03:30 PM ET · NASDAQ/)).toBeInTheDocument();
+    });
+  });
 });

web/src/views/HomeView.tsx

@@ -55,6 +55,19 @@ function formatPriceLabel(ts: number, period: Period) {
   return d.toLocaleDateString([], { month: 'short', day: 'numeric' });
 }
 
+function formatAsOfTimestamp(ts: number | null) {
+  if (ts == null) return 'Latest bar pending';
+
+  return new Date(ts).toLocaleString('en-US', {
+    timeZone: 'America/New_York',
+    month: 'short',
+    day: 'numeric',
+    year: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit',
+  });
+}
+
 function average(values: number[]) {
   return values.reduce((sum, value) => sum + value, 0) / values.length;
 }
@@ -150,7 +163,15 @@ function normalizeResearchProfile(profile: any): ResearchProfile | null {
 }
 
 // ─── Ticker header ────────────────────────────────────────────────────────────
-export function TickerHeader({ symbol, profile }: { symbol: string; profile?: ResearchProfile | null }) {
+export function TickerHeader({
+  symbol,
+  profile,
+  latestBarTimestamp,
+}: {
+  symbol: string;
+  profile?: ResearchProfile | null;
+  latestBarTimestamp?: number | null;
+}) {
   const navigate = useNavigate();
   const { botState } = useAppContext();
   const data = botState.symbols?.[symbol];
@@ -211,17 +232,20 @@ export function TickerHeader({ symbol, profile }: { symbol: string; profile?: Re
       </div>
 
       <div style={{ fontSize: 11, color: '#9CA3AF', marginTop: 3 }}>
-        {new Date().toLocaleString('en-US', {
-          month: 'short', day: 'numeric', year: 'numeric',
-          hour: '2-digit', minute: '2-digit',
-        })} ET · NASDAQ
+        {formatAsOfTimestamp(latestBarTimestamp ?? null)} ET · NASDAQ
       </div>
     </div>
   );
 }
 
 // ─── Stock chart ──────────────────────────────────────────────────────────────
-function StockChart({ symbol }: { symbol: string }) {
+function StockChart({
+  symbol,
+  onLatestBarTimestamp,
+}: {
+  symbol: string;
+  onLatestBarTimestamp?: (timestamp: number | null) => void;
+}) {
   const [period, setPeriod] = useState<Period>('1Y');
   const [bars, setBars]     = useState<OHLCVBar[]>([]);
   const [loading, setLoading] = useState(false);
@@ -237,12 +261,18 @@ function StockChart({ symbol }: { symbol: string }) {
     setLoading(true);
     setError(null);
     setBars([]);
+    onLatestBarTimestamp?.(null);
     fetchChartBars(symbol, period)
-      .then(data => { if (!cancelled) setBars(data); })
+      .then(data => {
+        if (!cancelled) {
+          setBars(data);
+          onLatestBarTimestamp?.(data.at(-1)?.ts ?? null);
+        }
+      })
       .catch(err  => { if (!cancelled) setError(err?.message ?? 'Failed to load chart'); })
       .finally(() => { if (!cancelled) setLoading(false); });
     return () => { cancelled = true; };
-  }, [symbol, period]);
+  }, [symbol, period, onLatestBarTimestamp]);
 
   const closes = bars.map(b => b.close);
   const rsi = calculateRsi(closes);
@@ -742,6 +772,7 @@ export function HomeView() {
   const { activeSymbol, setActiveSymbol } = useAppContext();
   const [profile, setProfile] = useState<ResearchProfile | null>(null);
   const [profileLoading, setProfileLoading] = useState(false);
+  const [latestBarTimestamp, setLatestBarTimestamp] = useState<number | null>(null);
 
   useEffect(() => {
     if (!activeSymbol) {
@@ -770,8 +801,8 @@ export function HomeView() {
 
   return (
     <div>
-      <TickerHeader symbol={activeSymbol} profile={profile} />
-      <StockChart symbol={activeSymbol} />
+      <TickerHeader symbol={activeSymbol} profile={profile} latestBarTimestamp={latestBarTimestamp} />
+      <StockChart symbol={activeSymbol} onLatestBarTimestamp={setLatestBarTimestamp} />
       <QuickStats symbol={activeSymbol} />
       <ResearchCards symbol={activeSymbol} profile={profile} profileLoading={profileLoading} />
     </div>