fix: show elapsed time in execution result dialog

- Remove setStartTime(null) from finally block to preserve start time for result display
- Add resetStartTime function to useCleaner hook
- Call resetStartTime when execution report dialog closes
- Add useEffect to update timer when execution completes

Now the total elapsed time (总耗时) will be shown in the result dialog after execution completes.

src/renderer/src/components/ExecutionReportDialog.tsx

@@ -61,6 +61,7 @@ export const ExecutionReportDialog: React.FC<ExecutionReportDialogProps> = ({
   const showProgress = isExecuting && progress
   const isProgressing = !!showProgress
 
+  // Update timer during progress
   React.useEffect(() => {
     if (!showProgress || !startTime) return
 
@@ -71,6 +72,27 @@ export const ExecutionReportDialog: React.FC<ExecutionReportDialogProps> = ({
     return () => clearInterval(interval)
   }, [showProgress, startTime])
 
+  // Update time when execution completes
+  React.useEffect(() => {
+    if (showProgress === false && startTime && isExecuting === false) {
+      setNow(Date.now())
+    }
+  }, [showProgress, isExecuting, startTime])
+
+  const elapsedTime = React.useMemo(() => {
+    if (!startTime) return null
+
+    const elapsedMs = now - startTime
+    const elapsedSeconds = Math.floor(elapsedMs / 1000)
+    const minutes = Math.floor(elapsedSeconds / 60)
+    const seconds = elapsedSeconds % 60
+
+    return {
+      totalSeconds: elapsedSeconds,
+      formatted: minutes > 0 ? `${minutes}分${seconds}秒` : `${seconds}秒`
+    }
+  }, [startTime, now])
+
   const estimatedTime = React.useMemo(() => {
     if (!showProgress || !startTime || !progress) return null
 
@@ -204,6 +226,15 @@ export const ExecutionReportDialog: React.FC<ExecutionReportDialogProps> = ({
             </div>
           )}
 
+          {elapsedTime && (
+            <div className="flex flex-col items-center gap-2 p-3 bg-blue-50 rounded-lg border border-blue-200 mb-2">
+              <div className="flex items-center gap-2 text-sm">
+                <span className="text-gray-600">已运行</span>
+                <span className="font-semibold text-blue-600">{elapsedTime.formatted}</span>
+              </div>
+            </div>
+          )}
+
           {estimatedTime && (
             <div className="flex flex-col items-center gap-2 p-3 bg-green-50 rounded-lg border border-green-200">
               <div className="flex items-center gap-2 text-sm">
@@ -307,6 +338,29 @@ export const ExecutionReportDialog: React.FC<ExecutionReportDialogProps> = ({
             )}
           </div>
 
+          {elapsedTime && (
+            <div className="flex items-center justify-center gap-2 p-3 bg-blue-50 rounded-lg border border-blue-200 text-blue-700 text-sm mb-3">
+              <svg
+                xmlns="http://www.w3.org/2000/svg"
+                width="16"
+                height="16"
+                viewBox="0 0 24 24"
+                fill="none"
+                stroke="currentColor"
+                strokeWidth="2"
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                className="flex-shrink-0"
+              >
+                <circle cx="12" cy="12" r="10" />
+                <polyline points="12 6 12 12 16 14" />
+              </svg>
+              <span>
+                总耗时：<span className="font-semibold">{elapsedTime.formatted}</span>
+              </span>
+            </div>
+          )}
+
           {hasErrors && (
             <div className="mt-4 pt-4 border-t border-gray-200">
               <div className="text-sm font-semibold text-red-600 mb-2">错误详情</div>

src/renderer/src/hooks/useCleaner.ts

@@ -471,10 +471,15 @@ export function useCleaner() {
       setIsRunning(false)
       setIsExecuting(false)
       setProgress(null)
-      setStartTime(null)
+      // Note: Don't clear startTime here - it's needed for the execution report dialog
+      // startTime will be reset when the dialog closes and a new execution starts
     }
   }
 
+  const resetStartTime = useCallback(() => {
+    setStartTime(null)
+  }, [])
+
   const handleExportResults = async () => {
     if (filteredResults.length === 0) {
       showWarning('没有数据可导出')
@@ -554,6 +559,7 @@ export function useCleaner() {
     handleAssignManagerOnSelect,
     progress,
     startTime,
+    resetStartTime,
     handleValidation,
     handleCheckboxToggle,
     handleConfirmDeletion,

src/renderer/src/pages/CleanerPage.tsx

@@ -64,6 +64,7 @@ const CleanerPage: React.FC = () => {
     handleAssignManagerOnSelect,
     progress,
     startTime,
+    resetStartTime,
     handleValidation,
     handleCheckboxToggle,
     handleConfirmDeletion,
@@ -509,7 +510,10 @@ const CleanerPage: React.FC = () => {
       {/* Execution Report Dialog */}
       <ExecutionReportDialog
         isOpen={isReportDialogOpen}
-        onClose={() => setIsReportDialogOpen(false)}
+        onClose={() => {
+          setIsReportDialogOpen(false)
+          resetStartTime()
+        }}
         ordersProcessed={reportData?.ordersProcessed}
         materialsDeleted={reportData?.materialsDeleted}
         materialsSkipped={reportData?.materialsSkipped}