fix(dashboard): normalize task modal timestamps to local time (#282)

新增共享 time.ts 时间工具，统一 TaskModal 中调度时间、流转日志、活动时间的本地时区渲染，消除 UTC/本地混显问题

edict/frontend/src/components/TaskModal.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState, useRef, useCallback } from 'react';
 import { useStore, getPipeStatus, deptColor, stateLabel, STATE_LABEL } from '../store';
 import { api } from '../api';
+import { formatDashboardDateTime, formatDashboardTime } from '../time';
 import type {
   Task,
   TaskActivityData,
@@ -43,13 +44,7 @@ function fmtStalled(sec: number): string {
 }
 
 function fmtActivityTime(ts: number | string | undefined): string {
-  if (!ts) return '';
-  if (typeof ts === 'number') {
-    const d = new Date(ts);
-    return `${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}:${String(d.getSeconds()).padStart(2, '0')}`;
-  }
-  if (typeof ts === 'string' && ts.length >= 19) return ts.substring(11, 19);
-  return String(ts).substring(0, 8);
+  return formatDashboardTime(ts, { showSeconds: true });
 }
 
 export default function TaskModal() {
@@ -302,8 +297,8 @@ export default function TaskModal() {
             </div>
             {sched && (
               <div className="sched-line">
-                {sched.lastProgressAt && <span>最近进展 {(sched.lastProgressAt || '').replace('T', ' ').substring(0, 19)}</span>}
-                {sched.lastDispatchAt && <span>最近派发 {(sched.lastDispatchAt || '').replace('T', ' ').substring(0, 19)}</span>}
+                {sched.lastProgressAt && <span>最近进展 {formatDashboardDateTime(sched.lastProgressAt)}</span>}
+                {sched.lastDispatchAt && <span>最近派发 {formatDashboardDateTime(sched.lastDispatchAt)}</span>}
                 <span>自动回滚 {sched.autoRollback === false ? '关闭' : '开启'}</span>
                 {sched.lastDispatchAgent && <span>目标 {sched.lastDispatchAgent}</span>}
               </div>
@@ -365,7 +360,7 @@ export default function TaskModal() {
                   const col = deptColor(fl.from || '');
                   return (
                     <div className="fl-item" key={i}>
-                      <div className="fl-time">{fl.at ? fl.at.substring(11, 16) : ''}</div>
+                      <div className="fl-time">{formatDashboardTime(fl.at, { showSeconds: false })}</div>
                       <div className="fl-dot" style={{ background: col }} />
                       <div className="fl-content">
                         <div className="fl-who">
@@ -458,7 +453,7 @@ function LiveActivitySection({
   const agentParts: string[] = [];
   if (data.agentLabel) agentParts.push(data.agentLabel);
   if (data.relatedAgents && data.relatedAgents.length > 1) agentParts.push(`${data.relatedAgents.length}个 Agent`);
-  if (data.lastActive) agentParts.push(`最后活跃: ${data.lastActive}`);
+  if (data.lastActive) agentParts.push(`最后活跃: ${formatDashboardDateTime(data.lastActive)}`);
 
   // Phase durations
   const phaseDurations = data.phaseDurations || [];

edict/frontend/src/time.ts

@@ -0,0 +1,57 @@
+function pad2(value: number): string {
+  return String(value).padStart(2, '0');
+}
+
+export function parseDashboardTimestamp(value: number | string | undefined | null): Date | null {
+  if (value === undefined || value === null || value === '') return null;
+
+  if (typeof value === 'number') {
+    const ms = Math.abs(value) < 1e12 ? value * 1000 : value;
+    const d = new Date(ms);
+    return Number.isNaN(d.getTime()) ? null : d;
+  }
+
+  const raw = String(value).trim();
+  if (!raw) return null;
+
+  if (/^\d+(\.\d+)?$/.test(raw)) {
+    return parseDashboardTimestamp(Number(raw));
+  }
+
+  let normalized = raw;
+  if (normalized.includes(' ') && !normalized.includes('T')) {
+    normalized = normalized.replace(' ', 'T');
+  }
+
+  const looksIso = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/.test(normalized);
+  const hasTimezone = /(?:Z|[+\-]\d{2}:\d{2})$/i.test(normalized);
+  if (looksIso && !hasTimezone) {
+    normalized += 'Z';
+  }
+
+  const d = new Date(normalized);
+  return Number.isNaN(d.getTime()) ? null : d;
+}
+
+export function formatDashboardTime(
+  value: number | string | undefined | null,
+  { showSeconds = true }: { showSeconds?: boolean } = {}
+): string {
+  const d = parseDashboardTimestamp(value);
+  if (!d) return '';
+  const hh = pad2(d.getHours());
+  const mm = pad2(d.getMinutes());
+  if (!showSeconds) return `${hh}:${mm}`;
+  return `${hh}:${mm}:${pad2(d.getSeconds())}`;
+}
+
+export function formatDashboardDateTime(
+  value: number | string | undefined | null,
+  { showSeconds = true }: { showSeconds?: boolean } = {}
+): string {
+  const d = parseDashboardTimestamp(value);
+  if (!d) return '';
+  const date = `${d.getFullYear()}-${pad2(d.getMonth() + 1)}-${pad2(d.getDate())}`;
+  const time = formatDashboardTime(d.getTime(), { showSeconds });
+  return `${date} ${time}`;
+}