fix(hero): align header slider title/search stack with zibll

Put hero main title/subtitle in search before_html (document flow),
move the search overlay outside the swiper as a sibling, and reset
search/slide-text positioning to zibll tops so title and search no
longer overlap.

assets/css/frontend/header-components/admin-hint.css

@@ -25,20 +25,7 @@
     color: #ffe082;
 }
 
-/* ============================================================
- * Layer 2: 搜索覆盖模块（在轮播内部 absolute 定位）
- * ============================================================ */
-.header-components-search {
-    position: absolute;
-    bottom: 25%;
-    left: 50%;
-    transform: translateX(-50%);
-    z-index: 10;
-    width: 100%;
-    max-width: 600px;
-    padding: 0 16px;
-}
-
+/* Legacy form-class helpers (unused by zibll-aligned search; kept for admin-only markup) */
 .header-components-search__form {
     display: flex;
     align-items: center;
@@ -87,4 +74,3 @@
     font-weight: 500;
     flex-shrink: 0;
 }
-