fix(clazz-e2e): robust event click, selector fix, supervisor graceful skip

- clazz-scheduling: use JS dispatchEvent to bypass fc-timegrid-event-harness
- clazz-scheduling: wait for event visibility instead of immediate count
- clazz-dual-view: fix .view-toolbar__range selector (sibling not child)
- clazz-supervisor-matrix: improve role switch confirm dialog handling
- clazz-supervisor-matrix: graceful skip when 周晓慧 has no courses this week

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

tests/clazz-scheduling.spec.ts

@@ -218,7 +218,7 @@ test.describe('排课系统 E2E（阿难账号）', () => {
     await page.waitForTimeout(3000);
 
     const events = page.locator('.fc-event');
-    expect(await events.count()).toBeGreaterThanOrEqual(1);
+    await expect(events.first()).toBeVisible({ timeout: 15_000 });
   });
 
   test('教师端排课详情有操作记录和点名按钮', async ({ page }) => {
@@ -228,11 +228,37 @@ test.describe('排课系统 E2E（阿难账号）', () => {
     await expect(page.locator('#app')).toBeVisible({ timeout: 60_000 });
     await page.waitForTimeout(3000);
 
-    const ev = page.locator('.fc-event').first();
-    if (!(await ev.isVisible().catch(() => false))) test.skip(true, '日历无事件');
-    await ev.click();
+    // Wait for FullCalendar to render
+    await expect(page.locator('.fc')).toBeVisible({ timeout: 15_000 });
     await page.waitForTimeout(2000);
 
+    // Debug: check event state
+    const eventCount = await page.locator('.fc-event').count();
+    console.log(`Found ${eventCount} fc-event elements`);
+
+    if (eventCount === 0) {
+      // Try scrolling the fc-scroller to make events visible
+      await page.evaluate(() => {
+        const scroller = document.querySelector('.fc-scroller');
+        if (scroller) {
+          scroller.scrollTop = 400;
+          scroller.dispatchEvent(new Event('scroll'));
+        }
+      });
+      await page.waitForTimeout(2000);
+    }
+
+    const ev = page.locator('.fc-event').first();
+    if (!(await ev.isVisible({ timeout: 5000 }).catch(() => false))) {
+      const total = await page.locator('.fc-event').count();
+      console.log(`After scroll: ${total} fc-event elements`);
+      test.skip(true, '日历无事件');
+      return;
+    }
+    // Trigger click via JS to bypass fc-timegrid-event-harness interception
+    await ev.evaluate((el) => el.dispatchEvent(new MouseEvent('click', { bubbles: true })));
+    await page.waitForTimeout(3000);
+
     await expect(page.locator('text=操作记录').first()).toBeVisible({ timeout: 10_000 });
     await expect(page.locator('button').filter({ hasText: '点名' }).first()).toBeVisible({ timeout: 10_000 });
   });