style: 加高顶部留白

- TOP_OFFSET 88 -> 104，搜索框与卡片间距 28 -> 44
- contentOffset 与 page-scroll margin/height 共用常量
- 验证 content/sider top=164

stash-web/src/AppNext.tsx

@@ -161,6 +161,8 @@ function matches(entry: Record<string, unknown>, keyword: string): boolean {
   return text.includes(keyword)
 }
 
+const TOP_OFFSET = 104
+
 export default function AppNext() {
   const { status, projects, error, live, refreshing, refresh } = useProjects()
   const { route, navigate } = useRoute()
@@ -208,8 +210,8 @@ export default function AppNext() {
     body.id = 'page-scroll'
     body.style.overflowY = 'auto'
     body.style.overflowX = 'hidden'
-    body.style.marginTop = '88px'
-    body.style.height = 'calc(100% - 88px)'
+    body.style.marginTop = `${TOP_OFFSET}px`
+    body.style.height = `calc(100% - ${TOP_OFFSET}px)`
     content.style.overflow = 'visible'
     content.style.marginTop = '0'
     main.style.height = 'auto'
@@ -603,7 +605,7 @@ export default function AppNext() {
         headerVariant="solid"
         siderBordered={false}
         contentPadding="none"
-        contentOffset={88}
+        contentOffset={TOP_OFFSET}
         height="screen"
         scrollable
         hideScrollbar