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/settings-sidebar-scroll.spec.ts

@@ -1,24 +1,15 @@
 import { test, expect } from "../../app/e2e/support/fixtures";
 import { gotoAppShell, openSettings } from "../../app/e2e/support/helpers/app";
+import { getServerId } from "../../app/e2e/support/helpers/server-id";
+import { installDesktopRuntime } from "./support/runtime";
 
 test.describe("Settings sidebar scrolling", () => {
   test.use({ viewport: { width: 900, height: 260 } });
 
   test("desktop drag region does not cover the scroll body", async ({ page }) => {
-    await page.addInitScript(() => {
-      window.paseoDesktop = {
-        platform: "darwin",
-        events: { on: () => () => {} },
-        invoke: async (command: string) => {
-          if (command === "get_desktop_settings") {
-            return {
-              releaseChannel: "stable",
-              daemon: { manageBuiltInDaemon: true, keepRunningAfterQuit: true },
-            };
-          }
-          return null;
-        },
-      };
+    await installDesktopRuntime(page, {
+      serverId: getServerId(),
+      manageBuiltInDaemon: true,
     });
 
     await gotoAppShell(page);