Mock lightweight-charts in StockDetail UI test to avoid canvas requirement

app/routes/__tests__/analyze.ticker.ui.test.tsx

@@ -1,5 +1,16 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { render, screen, fireEvent, waitFor } from "@testing-library/react";
+
+// Mock lightweight-charts to avoid canvas in test environment
+vi.mock("lightweight-charts", () => ({
+  createChart: () => ({
+    timeScale: () => ({ applyOptions: () => {}, fitContent: () => {} }),
+    addSeries: () => ({ setData: () => {} }),
+    remove: () => {},
+  }),
+  CandlestickSeries: {},
+}));
+
 import StockDetail from "../analyze.ticker";
 import { MemoryRouter } from "react-router";