feat: instrument analysis

frontend/src/pages/InstrumentDashboard.tsx

@@ -10,6 +10,9 @@ import InstrumentChart, { TheoPoint } from '../components/InstrumentChart'
 
 const api = axios.create({ baseURL: '/api' })
 
+// Stable empty array — prevents InstrumentChart useEffect from re-running on every render
+const NO_CHART_EVENTS: never[] = []
+
 // ── Types ─────────────────────────────────────────────────────────────────────
 
 interface CausalTemplate {
@@ -1283,7 +1286,7 @@ export default function InstrumentDashboard() {
           <InstrumentChart
             priceData={snapshot.price_data}
             indicators={snapshot.indicators}
-            events={[]}
+            events={NO_CHART_EVENTS}
             height={420}
             chartType={chartStyle}
             onDateHover={handleDateHover}