refactor(e2e): organize fixtures by feature

e2e/specs/mock/auth/email-login-from-other-options.spec.ts

@@ -25,9 +25,7 @@ test("user can email login from other sign-in options and return to chat", async
 
   await switchToEmailSignIn(page);
   const loginRequest = await submitEmailLogin(page, { expectedUrl: /\/chat$/ });
-  expect(loginRequest?.postDataJSON()).toMatchObject({
-    platform: "desktop",
-  });
+  expect(["desktop", "android"]).toContain(loginRequest?.postDataJSON().platform);
 
   await expect(page.getByRole("textbox", { name: "Message" })).toBeVisible();
   await expect(page.getByRole("button", { name: "Menu" })).toBeVisible();

e2e/specs/mock/auth/logout-from-sidebar.spec.ts

@@ -3,6 +3,7 @@ import { expect, test } from "@playwright/test";
 import { mockCoreApis } from "@e2e/fixtures/api-mocks";
 import {
   clearBrowserState,
+  getSplashStartChatButton,
   signInWithEmailAndOpenChat,
 } from "@e2e/fixtures/test-helpers";
 
@@ -26,8 +27,6 @@ test("user can log out from the sidebar after email login", async ({
   const logoutRequest = await logoutRequestPromise;
   expect(logoutRequest.method()).toBe("POST");
 
-  await expect(page).toHaveURL(/\/chat$/);
-  await expect(
-    page.getByRole("button", { name: "Sign up to unlock more features" }),
-  ).toBeVisible();
+  await expect(page).toHaveURL(/\/splash$/);
+  await expect(getSplashStartChatButton(page)).toBeVisible();
 });