fix: distinguish missing historical timing from zero duration

src/renderer/src/RightAssistantSidebar.resize.test.tsx

@@ -454,6 +454,20 @@ describe('RightAssistantSidebar resizing', () => {
     expect(screen.getByText('Project task a').closest('button')).toHaveAttribute('aria-current', 'true')
     expect(screen.getByText('Project task b').closest('article')).not.toHaveTextContent('任务累计用时')
 
+    view.rerender(sidebarElement({ ...props,
+      conversationStats: { ...props.conversationStats, replyDurationMs: 0 },
+      taskDurations: new Map([['a', { durationMs: 0, incomplete: true }]])
+    }))
+    expect(stats.getByText('暂无统计')).toBeVisible()
+    expect(stats.queryByText('00:00:00')).not.toBeInTheDocument()
+    expect(screen.getByText('任务累计用时: 暂无统计 (部分记录)')).toBeVisible()
+    view.rerender(sidebarElement({ ...props,
+      conversationStats: { ...props.conversationStats, replyDurationMs: 500 },
+      taskDurations: new Map([['a', { durationMs: 500, incomplete: true }]])
+    }))
+    expect(stats.getByText('00:00:00')).toBeVisible()
+    expect(screen.getByText('任务累计用时: 00:00:00 (部分记录)')).toBeVisible()
+
     view.rerender(sidebarElement({ ...props, activeConversationId: 'b' }))
     expect(stats.queryByText('Conversation A')).not.toBeInTheDocument()
     expect(stats.getAllByText('暂无统计')).toHaveLength(2)

src/renderer/src/RightAssistantSidebar.tsx

@@ -838,7 +838,8 @@ function RightAssistantSidebarView({
   const currentStats = activeConversationId && conversationStats?.conversationId === activeConversationId
     ? conversationStats
     : undefined
-  const formatDuration = (durationMs: number): string => {
+  const formatDuration = (durationMs: number, incomplete = false): string => {
+    if (incomplete && durationMs === 0) return t('sidebar.tasks.stats.unavailable')
     const seconds = Math.floor(Math.max(0, durationMs) / 1000)
     return `${Math.floor(seconds / 3600).toString().padStart(2, '0')}:${Math.floor(seconds / 60 % 60).toString().padStart(2, '0')}:${(seconds % 60).toString().padStart(2, '0')}`
   }
@@ -2105,7 +2106,7 @@ function RightAssistantSidebarView({
                 ? currentStats?.title ?? conversationTitles.get(activeConversationId) ?? t('sidebar.tasks.stats.currentConversation')
                 : t('sidebar.tasks.stats.noConversation')}</h3>
               <dl className="task-center__stat-grid">
-                <div><dt>{t('sidebar.tasks.stats.replyDuration')}</dt><dd>{currentStats ? formatDuration(currentStats.replyDurationMs) : t('sidebar.tasks.stats.unavailable')}</dd></div>
+                <div><dt>{t('sidebar.tasks.stats.replyDuration')}</dt><dd>{currentStats ? formatDuration(currentStats.replyDurationMs, currentStats.incomplete) : t('sidebar.tasks.stats.unavailable')}</dd></div>
                 <div><dt>{t('sidebar.tasks.stats.messages')}</dt><dd>{currentStats ? currentStats.messageCount.toLocaleString(locale) : t('sidebar.tasks.stats.unavailable')}</dd></div>
               </dl>
               {currentStats?.incomplete && <p className="task-center__incomplete">{t('sidebar.tasks.stats.incomplete')}</p>}
@@ -2253,7 +2254,7 @@ function RightAssistantSidebarView({
                       </span>
                       <span>{t(`task.status.${task.status}`)}</span>
                       {duration && <span title={t('sidebar.tasks.stats.taskDuration')}>
-                        {t('sidebar.tasks.stats.taskDuration')}: {formatDuration(duration.durationMs)}
+                        {t('sidebar.tasks.stats.taskDuration')}: {formatDuration(duration.durationMs, duration.incomplete)}
                         {duration.incomplete && ` (${t('sidebar.tasks.stats.partial')})`}
                       </span>}
                     </div>