fix(alerts): ignore superseded delivery diagnosis responses

Overlapping bulk diagnosis refreshes could resolve out of order and replace a current notifications-disabled warning with older dispatch evidence. Version each request, including empty alert sets, so only the newest response updates card diagnoses.

Pin overlap and empty-set invalidation with component and registered hook regressions. All 47 focused tests and TypeScript pass. Isolated Chromium verifies rendered ordering at three widths; update both subsystem contracts and bind browser proof to the runtime bytes. No backend delivery or recipient receipt is claimed.

Change-source: pulse-maintainer

scripts/check-alert-diagnosis-ordering.mjs

@@ -0,0 +1,146 @@
+// Isolated real-browser component qualification; no installed backend or delivery claim.
+import { createServer } from "../frontend-modern/node_modules/vite/dist/node/index.js";
+import solid from "../frontend-modern/node_modules/vite-plugin-solid/dist/esm/index.mjs";
+import { chromium } from "@playwright/test";
+import { resolve } from "node:path";
+import { mkdirSync } from "node:fs";
+import assert from "node:assert/strict";
+const root = resolve("frontend-modern");
+process.chdir(root);
+const fixture = `
+import { createSignal } from 'solid-js';
+import { render } from 'solid-js/web';
+import { Router, Route } from '@solidjs/router';
+import { AlertsAPI } from '/src/api/alerts';
+import { NotificationsAPI } from '/src/api/notifications';
+import { OverviewTab } from '/src/features/alerts/OverviewTab';
+import '/src/index.css';
+let finishOlder;
+let requests = 0;
+AlertsAPI.getDeliveryDiagnoses = () => {
+  requests++;
+  if (requests === 1) return new Promise(resolve => { finishOlder = resolve; });
+  return Promise.resolve([{alertIdentifier:'a1', alertId:'a1', status:'suppressed',
+    reason:'notifications_disabled', message:'Notifications disabled by current configuration'}]);
+};
+window.finishOlder = () => finishOlder([{alertIdentifier:'a1', alertId:'a1',
+  status:'would_send',reason:'ready',lastNotified:'2026-08-26T10:15:00Z'}]);
+window.requestCount = () => requests;
+AlertsAPI.getEvents = async () => [];
+NotificationsAPI.getHealth = async () => ({queue:{status:'healthy'}});
+const alert = id => ({id,resourceId:id,resourceName:'VM '+id,type:'cpu',level:'warning',
+message:'High CPU on '+id,startTime:new Date().toISOString(),acknowledged:false,node:'node1'});
+function Fixture() {
+const [alerts, setAlerts] = createSignal({a1:alert('a1')});
+return <main class="p-4"><button onClick={()=>setAlerts({a1:alert('a1'),a2:alert('a2')})}>Add alert</button>
+<OverviewTab overrides={[]} activeAlerts={alerts()}
+updateAlert={()=>{}} showQuickTip={()=>false} dismissQuickTip={()=>{}} showAcknowledged={()=>true}
+setShowAcknowledged={()=>{}} alertsDisabled={()=>false}/></main>; }
+render(()=><Router><Route path="/qualification" component={Fixture}/></Router>,document.getElementById('root'));
+`;
+const server = await createServer({
+  root,
+  configFile: false,
+  optimizeDeps: {
+    noDiscovery: true,
+    entries: [],
+    esbuildOptions: { target: "esnext" },
+  },
+  esbuild: { target: "esnext" },
+  plugins: [
+    solid(),
+    {
+      name: "dispatch-fixture",
+      configureServer(s) {
+        s.middlewares.use((req, res, next) => {
+          if (req.url === "/qualification") {
+            res.setHeader("Content-Type", "text/html");
+            res.end(
+              '<div id="root"></div><script type="module" src="/dispatch-fixture.tsx"></script>',
+            );
+          } else next();
+        });
+      },
+      resolveId(id) {
+        if (id === "/dispatch-fixture.tsx") return id;
+      },
+      load(id) {
+        if (id === "/dispatch-fixture.tsx") return fixture;
+      },
+    },
+  ],
+  resolve: { alias: { "@": resolve(root, "src") } },
+  server: { host: "127.0.0.1", port: 5199, strictPort: true },
+});
+let browser;
+try {
+  await server.listen();
+  browser = await chromium.launch({ headless: true });
+  mkdirSync("/tmp/pulse-alert-diagnosis-ordering", { recursive: true });
+  for (const width of [1440, 900, 390]) {
+    const page = await browser.newPage({ viewport: { width, height: 1000 } });
+    const errors = [];
+    page.on("pageerror", (e) => {
+      errors.push(e.message);
+      console.error(e.message);
+    });
+    page.on("console", (m) => {
+      if (m.type() === "error") console.error(m.text());
+    });
+    await page.route("http://127.0.0.1:5199/api/**", (route) =>
+      route.fulfill({ json: [] }),
+    );
+    await page.goto("http://127.0.0.1:5199/qualification");
+    await page.waitForFunction(() => window.requestCount?.() === 1);
+    await page.getByRole("button", { name: "Add alert", exact: true }).click();
+    await page
+      .getByText("Notifications are turned off", { exact: true })
+      .waitFor();
+    await page.evaluate(async () => {
+      window.finishOlder();
+      await Promise.resolve();
+    });
+    assert.equal(
+      await page
+        .getByText("Notifications are turned off", { exact: true })
+        .count(),
+      1,
+    );
+    assert.equal(await page.getByText(/^Dispatch requested /).count(), 0);
+    assert.equal(
+      await page.getByText("High CPU on a2", { exact: true }).count(),
+      1,
+    );
+    const label = page.getByText("Notifications are turned off", {
+      exact: true,
+    });
+    assert.equal(
+      await label.evaluate((el) => {
+        const range = document.createRange();
+        range.selectNodeContents(el);
+        return [...range.getClientRects()].every(
+          (b) => b.left >= 0 && b.right <= innerWidth,
+        );
+      }),
+      true,
+      "current status must fit viewport",
+    );
+    assert.deepEqual(errors, []);
+    await page.screenshot({
+      path: "/tmp/pulse-alert-diagnosis-ordering/" + width + ".png",
+      fullPage: true,
+    });
+    await page.close();
+  }
+  console.log(
+    JSON.stringify({
+      result: "passed",
+      viewports: [1440, 900, 390],
+      scope:
+        "Real Overview and Chromium; scripted diagnoses, not installed delivery or receipt",
+    }),
+  );
+} finally {
+  await browser?.close();
+  await server.close();
+}