test: update and add E2E, integration, visual, and webapp tests

- Update E2E tests: announcements, auth, auth-business-flow, full-route-regression, grades, navigation, smoke-auth, teacher-web-test

- Update integration tests: api-ai-chat, api-onboarding-complete, api-onboarding-status, proxy-guard, integration setup

- Update visual regression tests: admin-dashboard, homepage, student-dashboard, teacher-dashboard, visual config, helpers

- Update webapp tests: admin, parent, student full tests and debug scripts

- Add new webapp tests: announcements_messages, settings_profile, debug scripts

- Add webtest directory with test plans, screenshots, and diagnostic scripts

webtest/quick_login_test.py

@@ -0,0 +1,64 @@
+"""Quick login test for all accounts"""
+from playwright.sync_api import sync_playwright
+import time
+
+BASE_URL = "http://localhost:3000"
+ACCOUNTS = [
+    ("admin", "admin@xiaoxue.edu.cn", "123456"),
+    ("teacher", "t_chinese_1@xiaoxue.edu.cn", "123456"),
+    ("student", "student_g1c1_1@xiaoxue.edu.cn", "123456"),
+    ("parent", "parent_g1c1_1@xiaoxue.edu.cn", "123456"),
+]
+
+with sync_playwright() as p:
+    browser = p.chromium.launch(headless=True)
+    for role, email, password in ACCOUNTS:
+        context = browser.new_context(viewport={"width": 1440, "height": 900}, locale="zh-CN")
+        page = context.new_page()
+        print(f"\n>>> Testing {role} ({email})...")
+        try:
+            page.goto(f"{BASE_URL}/login", timeout=30000)
+            page.wait_for_load_state("networkidle", timeout=15000)
+            time.sleep(1)
+
+            email_input = page.locator('input[name="email"]')
+            if email_input.count() == 0:
+                email_input = page.locator('input[type="email"]')
+            email_input.fill(email)
+
+            password_input = page.locator('input[name="password"]')
+            if password_input.count() == 0:
+                password_input = page.locator('input[type="password"]')
+            password_input.fill(password)
+
+            # Click the submit button
+            submit_btn = page.locator('button[type="submit"]')
+            if submit_btn.count() == 0:
+                submit_btn = page.get_by_role("button", name="Sign In with Email")
+            if submit_btn.count() == 0:
+                submit_btn = page.locator("button").filter(has_text="Sign In")
+            
+            print(f"    Found button: {submit_btn.count()}")
+            submit_btn.click()
+
+            # Wait for navigation
+            try:
+                page.wait_for_url(lambda url: "/login" not in url, timeout=15000)
+            except Exception:
+                pass
+            page.wait_for_timeout(2000)
+
+            print(f"    Final URL: {page.url}")
+            if "/login" in page.url:
+                print(f"    ❌ {role} login FAILED")
+                # Check for error messages
+                error = page.locator('[role="alert"], .error, p:has-text("error"), p:has-text("failed")')
+                if error.count() > 0:
+                    print(f"    Error: {error.first.text_content()}")
+            else:
+                print(f"    ✅ {role} login SUCCESS")
+        except Exception as e:
+            print(f"    ❌ {role} exception: {e}")
+        finally:
+            context.close()
+    browser.close()