Add job queue for background analyze, enqueue from API, update MostActiveStocks form POST, add Playwright E2E for Save button

tests/save-button.spec.ts

@@ -0,0 +1,31 @@
+import { test, expect } from "@playwright/test";
+
+test("Save button enqueues analyze and upserts stock", async ({ page }) => {
+  await page.goto("/stocks");
+  await page.waitForSelector("table tbody tr");
+  const firstRow = page.locator("tbody tr").first();
+  const symbol = (await firstRow.locator("td a").textContent()) || "";
+
+  // Click the Save button in the first row and wait for analyze enqueue response
+  const [resp] = await Promise.all([
+    page.waitForResponse((r) => r.url().endsWith('/api/analyze') && (r.status() === 202 || r.status() === 200)),
+    firstRow.locator("button:has-text('Save')").click(),
+  ]);
+
+  expect([200, 202]).toContain(resp.status());
+
+  // Poll the /api/stocks until the ticker appears (give it a few seconds for background job)
+  const base = new URL(page.url()).origin;
+  let found = false;
+  for (let i = 0; i < 20; i++) {
+    const r = await page.request.get(`${base}/api/stocks`);
+    const list = await r.json();
+    if (list.some((s: any) => s.ticker === symbol.trim())) {
+      found = true;
+      break;
+    }
+    await page.waitForTimeout(300);
+  }
+
+  expect(found).toBeTruthy();
+});