fix(chat): isolate pending flows and cancel stale requests

src/utils/__tests__/abort.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+
+import { isAbortError } from "@/utils/abort";
+import { Result } from "@/utils/result";
+
+describe("isAbortError", () => {
+  it("recognizes cancellation after Result normalizes the error", async () => {
+    const result = await Result.wrap(async () => {
+      throw new DOMException("This operation was aborted", "AbortError");
+    });
+
+    expect(Result.isErr(result) && isAbortError(result.error)).toBe(true);
+  });
+
+  it("does not treat request timeouts as actor cancellation", () => {
+    expect(isAbortError(new DOMException("Timed out", "TimeoutError"))).toBe(
+      false,
+    );
+  });
+});

src/utils/abort.ts

@@ -0,0 +1,6 @@
+export function isAbortError(error: unknown): boolean {
+  if (!(error instanceof Error)) return false;
+  if (error.name === "AbortError") return true;
+  const cause = error.cause;
+  return cause !== error && isAbortError(cause);
+}