fix permissions and teacher attendance workflows

apps/server/src/database/date-normalization.spec.ts

@@ -0,0 +1,15 @@
+import { normalizeDateOnly } from './date-normalization';
+
+describe('normalizeDateOnly', () => {
+  it('keeps date-only values unchanged', () => {
+    expect(normalizeDateOnly('2026-07-02')).toBe('2026-07-02');
+  });
+
+  it('converts legacy ISO timestamps to their UTC calendar date', () => {
+    expect(normalizeDateOnly('2026-07-01T16:00:00.000Z')).toBe('2026-07-01');
+  });
+
+  it('rejects unsupported date formats', () => {
+    expect(() => normalizeDateOnly('07/01/2026')).toThrow('无效日期格式');
+  });
+});