fix(前端): 修复成员表头与加班导出

关键改动：

- 成员管理表格改为卡片内滚动，并固定每个表头单元格

- 加班导出按当前月份筛选导出记录

- 增加成员表头与加班导出月份过滤测试

Co-Authored-By: Codex GPT-5 <codex@openai.com>

apps/web/lib/member-page-header.test.ts

@@ -0,0 +1,28 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+
+test('members table pins each header cell above scrolling rows', () => {
+  const source = readFileSync(join(process.cwd(), 'app/admin/members/page.tsx'), 'utf8');
+  const headerClassNames = Array.from(
+    source.matchAll(/<th className="([^"]+)">/g),
+    (match) => match[1],
+  );
+
+  assert.equal(headerClassNames.length, 6);
+  for (const className of headerClassNames) {
+    assert.match(className, /\bsticky\b/);
+    assert.match(className, /\btop-0\b/);
+    assert.match(className, /\bz-20\b/);
+    assert.match(className, /bg-\[var\(--bg-subtle\)\]/);
+  }
+});
+
+test('members table scrolls inside the table card instead of the padded page area', () => {
+  const source = readFileSync(join(process.cwd(), 'app/admin/members/page.tsx'), 'utf8');
+
+  assert.match(source, /className="flex-1 overflow-hidden bg-\[var\(--bg\)\] px-5 py-4"/);
+  assert.match(source, /className="h-full overflow-hidden rounded-2xl border border-\[var\(--line\)\] bg-\[var\(--bg-card\)\] shadow-\[var\(--shadow-sm\)\]"/);
+  assert.match(source, /className="h-full overflow-y-auto"/);
+});

apps/web/lib/overtime.test.ts

@@ -1,12 +1,13 @@
-import assert from 'node:assert/strict';
 import test from 'node:test';
+import assert from 'node:assert/strict';
 
 import {
+  filterOvertimeRecordsForExportMonth,
   filterOvertimeRecordsForViewer,
   type OvertimeRecord,
 } from './overtime';
-import type { Department, Member, RoleItem } from './members';
 import type { AuthUser } from './auth-user';
+import type { Department, Member, RoleItem } from './members';
 
 const departments: Department[] = [
   { id: 'dept-tech', name: 'Tech', order: 1, createdAt: '2024-01-01' },
@@ -28,6 +29,29 @@ const records: OvertimeRecord[] = [
   record('ot-pm', 'PM Carol'),
 ];
 
+const exportRecords: OvertimeRecord[] = [
+  {
+    id: 'july-1',
+    projectId: 'project-1',
+    person: 'Alice',
+    startTime: '2026-07-01T19:00:00',
+    endTime: '2026-07-01T21:00:00',
+    duration: 2,
+    reasonId: 'reason-1',
+    createdAt: '2026-07-01',
+  },
+  {
+    id: 'august-1',
+    projectId: 'project-1',
+    person: 'Bob',
+    startTime: '2026-08-02T19:00:00',
+    endTime: '2026-08-02T21:00:00',
+    duration: 2,
+    reasonId: 'reason-1',
+    createdAt: '2026-08-02',
+  },
+];
+
 test('filterOvertimeRecordsForViewer limits non-admin viewers to their department tree', () => {
   const visible = filterOvertimeRecordsForViewer(records, {
     viewer: toAuthUser(members[0]),
@@ -50,6 +74,18 @@ test('filterOvertimeRecordsForViewer lets wildcard admin view every department',
   assert.deepEqual(visible.map((item) => item.id), ['ot-front', 'ot-back', 'ot-pm']);
 });
 
+test('filters export records by selected month', () => {
+  const result = filterOvertimeRecordsForExportMonth(exportRecords, '2026-07');
+
+  assert.deepEqual(result.map((record) => record.id), ['july-1']);
+});
+
+test('keeps all export records when all months are selected', () => {
+  const result = filterOvertimeRecordsForExportMonth(exportRecords, '');
+
+  assert.deepEqual(result.map((record) => record.id), ['july-1', 'august-1']);
+});
+
 function member(id: string, name: string, departmentId: string, roleId: string): Member {
   return {
     id,

apps/web/lib/overtime.ts

@@ -118,6 +118,14 @@ export function calcDuration(start: string, end: string): number {
   return Math.round(total * 10) / 10;
 }
 
+export function filterOvertimeRecordsForExportMonth(
+  records: OvertimeRecord[],
+  monthFilter: string,
+): OvertimeRecord[] {
+  if (!monthFilter) return [...records];
+  return records.filter((record) => record.startTime.slice(0, 7) === monthFilter);
+}
+
 function collectDepartmentTreeIds(departments: Department[], departmentId: string): Set<string> {
   const ids = new Set<string>([departmentId]);
   let changed = true;