feat: expand intelligent investigation workspace

src/features/workbench/hooks/investigation-presentation-follower.test.ts

@@ -158,3 +158,44 @@ describe("live investigation presentation following", () => {
     } finally { oldDisplay.resolve(); test.follower.stop(); }
   });
 });
+
+
+it("buffers live events while saved history is loading and drains only after that boundary", async () => {
+  const ready = deferred<void>();
+  const loadHistory = vi.fn(async () => ready.promise);
+  const test = setup({ loadHistory });
+  test.follower.start(); test.channel.publish({ type: "open" });
+  try {
+    await vi.waitFor(() => expect(loadHistory).toHaveBeenCalledTimes(1));
+    test.channel.publish({ type: "events", events: [event(11, openChart)] });
+    expect(test.execute).not.toHaveBeenCalled();
+    ready.resolve();
+    await vi.waitFor(() => expect(test.execute).toHaveBeenCalledTimes(1));
+  } finally { test.follower.stop(); }
+});
+
+it("loads saved history without live following and aborts an unfinished history load on stop", async () => {
+  const ready = deferred<void>();
+  const loadHistory = vi.fn(async (_cursor: InvestigationPresentationCursor, _signal: AbortSignal) => ready.promise);
+  const subscribe = vi.fn();
+  const test = setup({ follow: false, loadHistory, subscribe });
+  test.follower.start();
+  await vi.waitFor(() => expect(loadHistory).toHaveBeenCalledTimes(1));
+  expect(subscribe).not.toHaveBeenCalled();
+  test.follower.stop();
+  expect(loadHistory.mock.calls[0][1].aborted).toBe(true);
+  ready.resolve();
+  expect(test.execute).not.toHaveBeenCalled();
+});
+
+
+it("reads saved history even before the live event stream opens", async () => {
+  const loadHistory = vi.fn(async () => undefined);
+  const test = setup({ loadHistory });
+  test.follower.start();
+  try {
+    await vi.waitFor(() => expect(loadHistory).toHaveBeenCalledTimes(1));
+    await vi.waitFor(() => expect(test.onStatus).toHaveBeenCalledWith("history"));
+    expect(test.execute).not.toHaveBeenCalled();
+  } finally { test.follower.stop(); }
+});