fix: stop gmail watcher restart on bind error

src/hooks/gmail-watcher.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+import { isAddressInUseError } from "./gmail-watcher.js";
+
+describe("gmail watcher", () => {
+  it("detects address already in use errors", () => {
+    expect(
+      isAddressInUseError(
+        "listen tcp 127.0.0.1:8788: bind: address already in use",
+      ),
+    ).toBe(true);
+    expect(isAddressInUseError("EADDRINUSE: address already in use")).toBe(true);
+    expect(isAddressInUseError("some other error")).toBe(false);
+  });
+});