fix: 实际耗时改为精确时间戳计算（精确到0.5h）

之前用日期+工作日×8h 计算耗时太粗糙，现改为：
- DevTask startDate/completedAt 使用完整 ISO 时间戳（含时分秒）
- TestCase startedAt/completedAt 同上
- 耗时 = (endTimestamp - startTimestamp) / 3600000，精确到0.5h
- 详情抽屉显示精确到分钟的时间（YYYY-MM-DD HH:mm）

例如：08:00 开始，10:30 提测，耗时 2.5h（不再是8h）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/components/dev-task/DevTaskDetailDrawer.tsx

@@ -161,7 +161,7 @@ export function DevTaskDetailDrawer({ taskId, allTaskIds, onClose }: Props) {
                 <div className="flex items-center gap-2">
                   <Play className="h-3 w-3 text-[var(--ink-muted)]" />
                   <span className="text-[var(--ink-muted)]">开始开发</span>
-                  <span className="text-[var(--ink)]">{task.startDate}</span>
+                  <span className="text-[var(--ink)]">{task.startDate.slice(0, 16).replace('T', ' ')}</span>
                 </div>
               )}
               {task.dueDate && (
@@ -175,7 +175,7 @@ export function DevTaskDetailDrawer({ taskId, allTaskIds, onClose }: Props) {
                 <div className="flex items-center gap-2">
                   <Calendar className="h-3 w-3 text-[var(--ink-muted)]" />
                   <span className="text-[var(--ink-muted)]">提测</span>
-                  <span className="text-emerald-600 font-medium">{task.completedAt}</span>
+                  <span className="text-emerald-600 font-medium">{task.completedAt.slice(0, 16).replace('T', ' ')}</span>
                 </div>
               )}
             </div>

apps/web/components/test-case/TestCaseDetailDrawer.tsx

@@ -127,8 +127,8 @@ export function TestCaseDetailDrawer({ testCaseId, onClose, onCreateBug }: Props
               <div><span className="text-[var(--ink-muted)]">负责人：</span><span className="text-[var(--ink)] font-medium">{tc.assigneeId || '-'}</span></div>
               <div><span className="text-[var(--ink-muted)]">创建人：</span><span className="text-[var(--ink)]">{tc.createdBy}</span></div>
               <div><span className="text-[var(--ink-muted)]">创建日期：</span><span className="text-[var(--ink)]">{tc.createdAt.slice(0, 10)}</span></div>
-              {tc.startedAt && <div><span className="text-[var(--ink-muted)]">开始执行：</span><span className="text-[var(--ink)]">{tc.startedAt}</span></div>}
+              {tc.startedAt && <div><span className="text-[var(--ink-muted)]">开始执行：</span><span className="text-[var(--ink)]">{tc.startedAt.slice(0, 16).replace('T', ' ')}</span></div>}
-              {tc.completedAt && <div><span className="text-[var(--ink-muted)]">执行完成：</span><span className="text-[var(--ink)]">{tc.completedAt}</span></div>}
+              {tc.completedAt && <div><span className="text-[var(--ink-muted)]">执行完成：</span><span className="text-[var(--ink)]">{tc.completedAt.slice(0, 16).replace('T', ' ')}</span></div>}
               {tc.startedAt && <div><span className="text-[var(--ink-muted)]">测试耗时：</span><span className="text-[var(--ink)] font-medium">{calcActualHoursByDates(tc.startedAt, tc.completedAt)}h</span></div>}
             </div>
           </div>

apps/web/lib/dev-task.ts

@@ -83,18 +83,12 @@ export function formatHours(hours: number): string {
 
 export function calcActualHoursByDates(startDate?: string, completedAt?: string): number {
   if (!startDate) return 0;
-  const end = completedAt || new Date().toISOString().slice(0, 10);
+  const end = completedAt || new Date().toISOString();
-  const start = new Date(startDate);
+  const startMs = new Date(startDate).getTime();
-  const endDate = new Date(end);
+  const endMs = new Date(end).getTime();
-  if (isNaN(start.getTime()) || isNaN(endDate.getTime()) || endDate < start) return 0;
+  if (isNaN(startMs) || isNaN(endMs) || endMs < startMs) return 0;
-  let workDays = 0;
+  const diffHours = (endMs - startMs) / (1000 * 60 * 60);
-  const current = new Date(start);
+  return Math.round(diffHours * 2) / 2; // 精确到0.5h
-  while (current <= endDate) {
-    const day = current.getDay();
-    if (day !== 0 && day !== 6) workDays++;
-    current.setDate(current.getDate() + 1);
-  }
-  return workDays * 8;
 }
 
 export function generateTaskNo(existingTasks: DevTask[]): string {

apps/web/stores/useDevTaskStore.ts

@@ -77,10 +77,9 @@ export const useDevTaskStore = create<DevTaskState>((set, get) => ({
     if (!canTransition(task.status, to)) {
       return { ok: false, message: `不允许从「${task.status}」流转到「${to}」` };
     }
-    const today = new Date().toISOString().slice(0, 10);
+    const now = new Date().toISOString();
-    const startDate = (to === 'in_progress' && !task.startDate) ? today : task.startDate;
+    const startDate = (to === 'in_progress' && !task.startDate) ? now : task.startDate;
-    // 开发完成时间 = 提测时间（不是测试完成时间）
+    const completedAt = (to === 'submitted' && !task.completedAt) ? now : task.completedAt;
-    const completedAt = (to === 'submitted' && !task.completedAt) ? today : task.completedAt;
     get().updateTask(id, { status: to, startDate, completedAt });
     return { ok: true };
   },

apps/web/stores/useTestCaseStore.ts

@@ -74,14 +74,12 @@ export const useTestCaseStore = create<TestCaseState>((set, get) => ({
     if (!canTcTransition(tc.status, to)) {
       return { ok: false, message: `不允许从「${tc.status}」流转到「${to}」` };
     }
-    const today = new Date().toISOString().slice(0, 10);
+    const now = new Date().toISOString();
     const patch: Partial<TestCase> = { status: to };
-    // 开始执行时间
+    if (to === 'running' && !tc.startedAt) patch.startedAt = now;
-    if (to === 'running' && !tc.startedAt) patch.startedAt = today;
+    if (to === 'passed' || to === 'failed' || to === 'blocked') patch.completedAt = now;
-    // 执行完成时间（通过/失败/阻塞都算执行完成）
-    if (to === 'passed' || to === 'failed' || to === 'blocked') patch.completedAt = today;
     if (to === 'running' || to === 'passed' || to === 'failed' || to === 'blocked') {
-      patch.executedAt = today;
+      patch.executedAt = now;
     }
     // 回退到执行中时清除完成时间
     if (to === 'running') { patch.failReason = undefined; patch.blockReason = undefined; patch.completedAt = undefined; }