feat(explore): improve article timestamps

apps/web_v1/src/App.css

@@ -922,6 +922,27 @@
   gap: 2px;
 }
 
+.explore-article-meta-line {
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+}
+
+.explore-article-meta-line > :first-child {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.explore-article-list-time {
+  flex: 0 0 auto;
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+}
+
 .explore-article-title {
   display: -webkit-box;
   overflow: hidden;

apps/web_v1/src/pages/workspace-explore.tsx

@@ -407,7 +407,10 @@ export function WorkspaceExplorePage({
                     >
                       <span className={`explore-source-logo ${itemSource.color}`}>{sourceInitial(itemSource.name)}</span>
                       <span className="explore-article-copy">
-                        <Text type="secondary">{itemSource.name} · {itemTime(item)}</Text>
+                        <span className="explore-article-meta-line">
+                          <Text type="secondary">{itemSource.name}</Text>
+                          <Text className="explore-article-list-time" type="secondary">{itemTime(item)}</Text>
+                        </span>
                         <Text className="explore-article-title">{item.title}</Text>
                         <Text className="explore-article-summary" type="secondary" ellipsis={{ showTooltip: true }}>
                           {item.summary || '暂无摘要'}
@@ -565,7 +568,22 @@ function itemTime(item: DatasetItemDTO) {
   const value = item.publishedAt ?? item.createdAt
   const parsed = new Date(value)
   if (Number.isNaN(parsed.getTime())) return ''
-  return new Intl.DateTimeFormat('zh-CN', { dateStyle: 'medium' }).format(parsed)
+  const now = new Date()
+  const today = new Date(now.getFullYear(), now.getMonth(), now.getDate())
+  const itemDate = new Date(parsed.getFullYear(), parsed.getMonth(), parsed.getDate())
+  const dayDifference = Math.round((today.getTime() - itemDate.getTime()) / 86_400_000)
+  const dateLabel = dayDifference === 0
+    ? '今天'
+    : dayDifference === 1
+      ? '昨天'
+      : new Intl.DateTimeFormat('zh-CN', { month: 'numeric', day: 'numeric' }).format(parsed)
+  const timeLabel = new Intl.DateTimeFormat('zh-CN', {
+    hour: '2-digit',
+    minute: '2-digit',
+    second: '2-digit',
+    hourCycle: 'h23',
+  }).format(parsed)
+  return `${dateLabel} ${timeLabel}`
 }
 
 function sourceSubtitle(source: DatasetSourceDTO) {