fix(加班): 统一日期选择与耗时口径

apps/web/app/overtime/page.tsx

@@ -15,6 +15,7 @@ import { MonthPicker } from '@/components/MonthPicker';
 import { FilterSelect } from '@/components/FilterSelect';
 import { FieldError } from '@/components/FieldError';
 import { RouteGuard } from '@/components/auth/Guard';
+import { WorkDateTimePicker } from '@/components/WorkDateTimePicker';
 
 export default function OvertimePage() {
   return (
@@ -287,11 +288,22 @@ function OvertimeModal({ defaultPerson, products, projects, versions, reasons, r
           <div className="grid grid-cols-2 gap-3">
             <div>
               <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">开始时间 *</label>
-              <input type="datetime-local" value={startTime} onChange={(e) => { setStartTime(e.target.value); setEndTimeError(''); }} required className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none" />
+              <WorkDateTimePicker
+                value={startTime}
+                onChange={(next) => { setStartTime(next); setEndTimeError(''); }}
+                placeholder="选择加班开始时间"
+                defaultHour={19}
+              />
             </div>
             <div>
               <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1 block">结束时间 *</label>
-              <input type="datetime-local" value={endTime} onChange={(e) => { setEndTime(e.target.value); setEndTimeError(''); }} required className="h-9 w-full rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[13px] focus:border-[var(--accent)] focus:outline-none" />
+              <WorkDateTimePicker
+                value={endTime}
+                onChange={(next) => { setEndTime(next); setEndTimeError(''); }}
+                placeholder="选择加班结束时间"
+                defaultHour={21}
+                popoverAlign="right"
+              />
               <FieldError message={endTimeError} />
             </div>
           </div>