style(content): 明细页分组标题增加分区色条

- 分组标题与首页卡片统一为「色条 + 标题」，颜色取分区的 barColor
- 空分组不再在明细页占标题（后台仍保留）

stash-web/src/components/content/DetailView.tsx

@@ -74,8 +74,10 @@ export function DetailView({ category, groupId, onNavigate, onOpenItem }: Detail
     }
 
     const direct = (category.items ?? []) as RenderItem[]
+    // 空分组不占篇幅（管理后台仍然保留，之后可以往里加条目）
+    const filledGroups = groups.filter((group) => group.items.length > 0)
 
-    if (groups.length === 0) {
+    if (filledGroups.length === 0) {
       return direct.length > 0 ? (
         renderItems(direct)
       ) : (
@@ -83,19 +85,28 @@ export function DetailView({ category, groupId, onNavigate, onOpenItem }: Detail
       )
     }
 
-    if (groups.length === 1 && direct.length === 0) {
-      return renderItems(groups[0].items)
+    if (filledGroups.length === 1 && direct.length === 0) {
+      return renderItems(filledGroups[0].items)
     }
 
     return (
       <Space direction="column" gap="lg" align="stretch">
-        {groups.map((group) => (
-          <GroupBlock key={group.id} name={group.name}>
+        {filledGroups.map((group) => (
+          <GroupBlock
+            key={group.id}
+            name={group.name}
+            barColor={category.barColor !== '' ? category.barColor : undefined}
+          >
             {renderItems(group.items)}
           </GroupBlock>
         ))}
         {direct.length > 0 && (
-          <GroupBlock name="未分组">{renderItems(direct)}</GroupBlock>
+          <GroupBlock
+            name="未分组"
+            barColor={category.barColor !== '' ? category.barColor : undefined}
+          >
+            {renderItems(direct)}
+          </GroupBlock>
         )}
       </Space>
     )