fix(export): hide recent-export row when no history

src/pages/ExportPage.scss

@@ -1877,20 +1877,6 @@
     }
   }
 
-  .row-export-meta {
-    display: inline-flex;
-    flex-direction: column;
-    align-items: center;
-    gap: 1px;
-  }
-
-  .row-export-meta-label {
-    font-size: 10px;
-    line-height: 1.2;
-    color: var(--text-tertiary);
-    font-weight: 500;
-  }
-
   .row-export-time {
     font-size: 11px;
     line-height: 1.2;
@@ -1900,7 +1886,7 @@
     text-align: center;
   }
 
-  .row-export-link.state-running + .row-export-meta .row-export-time {
+  .row-export-link.state-running + .row-export-time {
     color: var(--primary);
     font-weight: 600;
   }
@@ -1911,11 +1897,6 @@
     text-decoration: none;
   }
 
-  .row-export-link.state-disabled + .row-export-meta .row-export-meta-label,
-  .row-export-link.state-disabled + .row-export-meta .row-export-time {
-    color: var(--text-tertiary);
-  }
-
   .row-export-link.state-disabled:hover:not(:disabled),
   .row-export-link.state-disabled:focus-visible {
     color: var(--text-tertiary);

src/pages/ExportPage.tsx

@@ -444,7 +444,7 @@ const formatPathBrief = (value: string, maxLength = 52): string => {
 }
 
 const formatRecentExportTime = (timestamp?: number, now = Date.now()): string => {
-  if (!timestamp) return '未导出'
+  if (!timestamp) return ''
   const diff = Math.max(0, now - timestamp)
   const minute = 60 * 1000
   const hour = 60 * minute
@@ -5067,7 +5067,9 @@ function ExportPage() {
     const checked = canExport && selectedSessions.has(contact.username)
     const isRunning = canExport && runningSessionIds.has(contact.username)
     const isQueued = canExport && queuedSessionIds.has(contact.username)
-    const recentExportTime = canExport ? formatRecentExportTime(lastExportBySession[contact.username], nowTick) : '—'
+    const recentExportTimestamp = lastExportBySession[contact.username]
+    const hasRecentExport = canExport && Boolean(recentExportTimestamp)
+    const recentExportTime = hasRecentExport ? formatRecentExportTime(recentExportTimestamp, nowTick) : ''
     const countedMessages = normalizeMessageCount(sessionMessageCounts[contact.username])
     const hintedMessages = normalizeMessageCount(matchedSession?.messageCountHint)
     const displayedMessageCount = countedMessages ?? hintedMessages
@@ -5229,12 +5231,7 @@ function ExportPage() {
                 >
                   {!canExport ? '暂无会话' : isRunning ? '导出中...' : isQueued ? '排队中' : '单会话导出'}
                 </button>
-                {canExport && (
-                  <div className="row-export-meta">
-                    <span className="row-export-meta-label">最近导出</span>
-                    <span className="row-export-time">{recentExportTime}</span>
-                  </div>
-                )}
+                {hasRecentExport && <span className="row-export-time">{recentExportTime}</span>}
               </div>
             </div>
           </div>