test(auth): add sign-in smoke test and core validation (#35501)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

e2e/features/apps/create-app.feature

@@ -1,4 +1,4 @@
-@apps @authenticated
+@apps @authenticated @core
 Feature: Create app
   Scenario: Create a new blank app and redirect to the editor
     Given I am signed in as the default E2E admin

e2e/features/apps/create-chatbot-app.feature

@@ -1,4 +1,4 @@
-@apps @authenticated
+@apps @authenticated @core @mode-matrix
 Feature: Create Chatbot app
   Scenario: Create a new Chatbot app and redirect to the configuration page
     Given I am signed in as the default E2E admin

e2e/features/apps/create-workflow-app.feature

@@ -1,4 +1,4 @@
-@apps @authenticated
+@apps @authenticated @core @mode-matrix
 Feature: Create Workflow app
   Scenario: Create a new Workflow app and redirect to the workflow editor
     Given I am signed in as the default E2E admin

e2e/features/auth/sign-in.feature

@@ -0,0 +1,8 @@
+@auth @smoke @core @unauthenticated
+Feature: Sign in
+
+  Scenario: Sign in with valid credentials and reach the apps console
+    Given I am not signed in
+    When I open the sign-in page
+    And I sign in as the default E2E admin
+    Then I should be on the apps console

e2e/features/auth/sign-out.feature

@@ -1,4 +1,4 @@
-@auth @authenticated
+@auth @authenticated @core
 Feature: Sign out
   Scenario: Sign out from the apps console
     Given I am signed in as the default E2E admin

e2e/features/step-definitions/auth/sign-in.steps.ts

@@ -0,0 +1,20 @@
+import type { DifyWorld } from '../../support/world'
+import { Then, When } from '@cucumber/cucumber'
+import { expect } from '@playwright/test'
+import { adminCredentials } from '../../../fixtures/auth'
+
+When('I open the sign-in page', async function (this: DifyWorld) {
+  await this.getPage().goto('/signin')
+})
+
+When('I sign in as the default E2E admin', async function (this: DifyWorld) {
+  const page = this.getPage()
+
+  await page.getByLabel('Email address').fill(adminCredentials.email)
+  await page.getByLabel('Password').fill(adminCredentials.password)
+  await page.getByRole('button', { name: 'Sign in' }).click()
+})
+
+Then('I should be on the apps console', async function (this: DifyWorld) {
+  await expect(this.getPage()).toHaveURL(/\/apps(?:\?.*)?$/, { timeout: 30_000 })
+})