feat: top-pick and open-trade status labels on the ticker page

Two read-only pills in the ticker header, beside the watchlist toggle:
- "Top Pick" when the ticker is the current #1 — the same ranking the dashboard
  highlights, via a shared topPickSymbol() helper so the two stay in sync.
- "Open Trade" when an open paper trade exists on the ticker.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/qualification.ts

@@ -49,6 +49,26 @@ export function qualifiesSetup(setup: TradeSetup, config: ActivationConfig): boo
   return true;
 }
 
+/**
+ * Symbol of the current single 'top pick' — the #1 row the dashboard highlights:
+ * the highest 12-1 momentum percentile among qualified setups (or among all
+ * setups when none qualify). Returns null when there are no setups. Keep in step
+ * with the Top Setups ranking in DashboardPage.
+ */
+export function topPickSymbol(
+  trades: TradeSetup[] | undefined,
+  activation: ActivationConfig | undefined,
+): string | null {
+  const all = trades ?? [];
+  if (all.length === 0) return null;
+  const qualified = activation ? all.filter((t) => qualifiesSetup(t, activation)) : [];
+  const pool = qualified.length > 0 ? qualified : all;
+  const top = [...pool].sort(
+    (a, b) => (b.momentum_percentile ?? -Infinity) - (a.momentum_percentile ?? -Infinity),
+  )[0];
+  return top?.symbol ?? null;
+}
+
 /** Short human summary of the active gate, e.g. for tooltips/labels. */
 export function activationSummary(config: ActivationConfig): string {
   const parts = [];

frontend/src/pages/TickerDetailPage.tsx

@@ -3,6 +3,10 @@ import { useParams } from 'react-router-dom';
 import { useTickerDetail } from '../hooks/useTickerDetail';
 import { useFetchSymbolData } from '../hooks/useFetchSymbolData';
 import { useWatchlist, useAddToWatchlist, useRemoveFromWatchlist } from '../hooks/useWatchlist';
+import { useTrades } from '../hooks/useTrades';
+import { usePaperTrades } from '../hooks/usePaperTrades';
+import { useActivation } from '../hooks/useActivation';
+import { topPickSymbol } from '../lib/qualification';
 import type { FetchSelector } from '../api/ingestion';
 import { CandlestickChart } from '../components/charts/CandlestickChart';
 import { ScoreCard } from '../components/ui/ScoreCard';
@@ -29,6 +33,21 @@ function SectionError({ message, onRetry }: { message: string; onRetry?: () => v
   );
 }
 
+function StatusPill({ tone, label, title }: { tone: 'blue' | 'emerald'; label: string; title?: string }) {
+  const tones = {
+    blue: 'bg-blue-500/15 text-blue-300 border-blue-500/30',
+    emerald: 'bg-emerald-500/15 text-emerald-300 border-emerald-500/30',
+  } as const;
+  return (
+    <span
+      title={title}
+      className={`inline-flex items-center rounded-full border px-2.5 py-1 text-xs font-medium ${tones[tone]}`}
+    >
+      {label}
+    </span>
+  );
+}
+
 function timeAgo(iso: string): string {
   const diff = Date.now() - new Date(iso).getTime();
   const mins = Math.floor(diff / 60_000);
@@ -107,6 +126,21 @@ export default function TickerDetailPage() {
     [watchlist.data, symbol],
   );
   const watchlistBusy = addToWatchlist.isPending || removeFromWatchlist.isPending;
+
+  // Status labels: is there an open paper trade on this ticker, and is it the
+  // current top pick (same ranking the dashboard highlights)?
+  const openTrades = usePaperTrades('open');
+  const allTrades = useTrades();
+  const activation = useActivation();
+  const hasOpenTrade = useMemo(
+    () => (openTrades.data ?? []).some((t) => t.symbol.toUpperCase() === symbol.toUpperCase()),
+    [openTrades.data, symbol],
+  );
+  const isTopPick = useMemo(
+    () => topPickSymbol(allTrades.data, activation.data)?.toUpperCase() === symbol.toUpperCase(),
+    [allTrades.data, activation.data, symbol],
+  );
+
   const [activeTab, setActiveTab] = useState<DetailTab>('Analysis');
   const [refreshingLabel, setRefreshingLabel] = useState<string | null>(null);
 
@@ -226,6 +260,20 @@ export default function TickerDetailPage() {
           )}
         </div>
         <div className="flex items-center gap-2">
+          {isTopPick && (
+            <StatusPill
+              tone="blue"
+              label="★ Top Pick"
+              title="Current top pick — highest-momentum qualified setup right now"
+            />
+          )}
+          {hasOpenTrade && (
+            <StatusPill
+              tone="emerald"
+              label="● Open Trade"
+              title="You have an open paper trade on this ticker"
+            />
+          )}
           <Button
             variant="ghost"
             onClick={() =>