Add custom headers to direct connections (#2922)

* Add custom headers to direct connections

* Address custom header review feedback

* Fix direct connection header integration

* Fix desktop relay E2E transport setup

---------

Co-authored-by: Claude <claude@Claudes-Mac-mini.local>
Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/desktop/e2e/pair-device-relay.spec.ts

@@ -1,4 +1,5 @@
 import { expect, test } from "../../app/e2e/support/fixtures";
+import type { Page } from "@playwright/test";
 import {
   startIsolatedHostDaemon,
   type IsolatedHostDaemon,
@@ -18,11 +19,12 @@ import {
   openPairDeviceFromHome,
   openRelaySecurityDocs,
   observePairingOfferRequests,
-  prepareLocalPairingHost,
+  preparePairingHost,
   reloadAndOpenPairDevice,
   retryRelayAndExpectFailure,
   switchPairDeviceToHost,
 } from "../../app/e2e/support/helpers/pair-device";
+import { installDesktopRuntime } from "./support/runtime";
 
 interface RelayConfigDaemonClient {
   close(): Promise<void>;
@@ -30,6 +32,20 @@ interface RelayConfigDaemonClient {
   patchDaemonConfig(config: { relay: { enabled: boolean } }): Promise<unknown>;
 }
 
+async function prepareLocalPairingHost(
+  page: Page,
+  daemon: Parameters<typeof preparePairingHost>[1],
+  additionalHosts: Parameters<typeof preparePairingHost>[2] = [],
+): Promise<void> {
+  const endpoint = "port" in daemon ? `127.0.0.1:${daemon.port}` : daemon.endpoint;
+  await installDesktopRuntime(page, {
+    serverId: daemon.serverId,
+    daemonListen: endpoint,
+    manageBuiltInDaemon: false,
+  });
+  await preparePairingHost(page, daemon, additionalHosts);
+}
+
 test.describe("local device relay pairing", () => {
   let relayOffDaemon: IsolatedHostDaemon;
   let relayEnableDaemon: IsolatedHostDaemon;