Paginate beta history and refresh pages from events

tests/unit/beta-updates.test.ts

@@ -0,0 +1,25 @@
+import { afterEach, expect, it, vi } from 'vitest';
+import { betaUpdates } from '../../src/lib/ui/beta-updates.js';
+afterEach(() => { vi.useRealTimers(); vi.unstubAllGlobals(); });
+it('refreshes relevant pushes and reconnects without polling, pauses hidden tabs, and cleans up', async () => {
+    vi.useFakeTimers();
+    const window = new EventTarget(), document = Object.assign(new EventTarget(), { hidden: false });
+    vi.stubGlobal('window', window); vi.stubGlobal('document', document);
+    let finish!: () => void;
+    const load = vi.fn(() => new Promise<void>(resolve => { finish = resolve; }));
+    const stop = betaUpdates(load, () => 7);
+    const change = (id: number) => window.dispatchEvent(Object.assign(new Event('ec:beta-changed'), { detail: { betaId: id } }));
+    try {
+        change(2); await vi.advanceTimersByTimeAsync(1000); expect(load).not.toHaveBeenCalled();
+        change(7); change(7); await vi.advanceTimersByTimeAsync(200); expect(load).toHaveBeenCalledTimes(1);
+        change(7); await vi.advanceTimersByTimeAsync(200); expect(load).toHaveBeenCalledTimes(1);
+        finish(); await vi.advanceTimersByTimeAsync(200); expect(load).toHaveBeenCalledTimes(2);
+        finish(); await vi.advanceTimersByTimeAsync(30000); expect(load).toHaveBeenCalledTimes(2);
+        document.hidden = true; change(7); await vi.advanceTimersByTimeAsync(1000); expect(load).toHaveBeenCalledTimes(2);
+        document.hidden = false; document.dispatchEvent(new Event('visibilitychange'));
+        await vi.advanceTimersByTimeAsync(200); expect(load).toHaveBeenCalledTimes(3); finish();
+        window.dispatchEvent(new Event('ec:pipeline-connected'));
+        await vi.advanceTimersByTimeAsync(200); expect(load).toHaveBeenCalledTimes(4); finish();
+        stop(); change(7); await vi.advanceTimersByTimeAsync(1000); expect(load).toHaveBeenCalledTimes(4);
+    } finally { stop(); }
+});