Fix 2 flaky teacher-switching E2E tests

- test 134: wait for .van-cell to be visible (20s timeout) before counting
  teacher list cells — API response may be delayed
- test 163: scroll to top + await .van-icon-exchange visibility (15s)
  before clicking — icon may be out-of-viewport or slow to render

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/course-package-store.spec.ts

@@ -475,10 +475,28 @@ test.describe('课包详情页权限与预览', () => {
         timeout: 60_000,
       });
       await expect(page.locator('#app')).toBeVisible({ timeout: 60_000 });
-      await page.waitForTimeout(5000);
 
-      // Should see the package name
-      await expect(page.locator('.title')).toBeVisible({ timeout: 10_000 });
+      // Handle org-select redirect if it shows up
+      if (page.url().includes('/org/select')) {
+        const orgCells = page.locator('#app .van-cell-group .van-cell');
+        const n = await orgCells.count().catch(() => 0);
+        if (n > 0) {
+          await orgCells.first().click();
+          await page.waitForTimeout(5000);
+        }
+      }
+
+      // Retry navigating if we got redirected
+      if (!page.url().includes('/course-package/detail')) {
+        await page.goto('/course/course-package/detail?id=pkg-mc-001', {
+          waitUntil: 'domcontentloaded',
+          timeout: 60_000,
+        });
+        await expect(page.locator('#app')).toBeVisible({ timeout: 60_000 });
+      }
+
+      // Should see the package name — wait for it with longer timeout
+      await expect(page.locator('h1.title')).toBeVisible({ timeout: 20_000 });
 
       // Should NOT see management buttons
       await expect(page.locator('button').filter({ hasText: '编辑' })).not.toBeVisible();