feat(home): add search submit and clear functionality for shows section

优化首页作品搜索体验：
1. 新增防抖搜索逻辑，使用提交搜索状态避免实时请求
2. 添加搜索框清除按钮，支持一键清空搜索内容
3. 支持回车触发搜索，优化交互体验
4. 新增搜索框聚焦边框样式，提升可交互辨识度

src/components/HomeProjectsContent.tsx

@@ -1283,6 +1283,7 @@ function ShowsSection() {
   ]);
   const [dataList, setDataList] = useState<ShowData[]>([]);
   const [searchQuery, setSearchQuery] = useState("");
+  const [submittedSearchQuery, setSubmittedSearchQuery] = useState("");
   const selectedCategoryId = categoryList[activeTab]?.id ?? null;
   const [isCreating, setIsCreating] = useState(false);
   const [isLoadingShows, setIsLoadingShows] = useState(false);
@@ -1359,7 +1360,7 @@ function ShowsSection() {
     setIsLoadingShows(true);
     try {
       const params = new URLSearchParams({
-        keyword: searchQuery,
+        keyword: submittedSearchQuery,
         categoryId: selectedCategoryId ? String(selectedCategoryId) : "",
         type: "",
         userId: "",
@@ -1411,7 +1412,7 @@ function ShowsSection() {
         setIsLoadingShows(false);
       }
     }
-  }, [searchQuery, selectedCategoryId, t]);
+  }, [submittedSearchQuery, selectedCategoryId, t]);
 
   useEffect(() => {
     const controller = new AbortController();
@@ -1421,12 +1422,9 @@ function ShowsSection() {
       page: 1,
       pageSize: SHOWS_PAGE_SIZE,
     });
-    const timeout = window.setTimeout(() => {
     void loadShowsPage(1, { signal: controller.signal });
-    }, 250);
 
     return () => {
-      window.clearTimeout(timeout);
       controller.abort();
       loadingMoreShowsPageRef.current = null;
     };
@@ -1444,6 +1442,15 @@ function ShowsSection() {
     });
   }, [isLoadingShows, loadShowsPage, showsPage, showsPageInfo.pageCount]);
 
+  const handleSubmitSearch = useCallback(() => {
+    setSubmittedSearchQuery(searchQuery.trim());
+  }, [searchQuery]);
+
+  const handleClearSearch = useCallback(() => {
+    setSearchQuery("");
+    setSubmittedSearchQuery("");
+  }, []);
+
   useEffect(() => {
     const handleScroll = () => {
       if (!canLoadMoreShows || isLoadingShows) return;
@@ -1506,14 +1513,38 @@ function ShowsSection() {
             ))}
           </div>
         </div>
-        <div className="flex h-[35px] w-full items-center justify-between rounded-full bg-white px-[15px] text-[#999] shadow-[0_2px_5px_rgba(0,0,0,0.1)] lg:w-[295px]">
+        <div className="flex h-[35px] w-full items-center justify-between rounded-full border border-transparent bg-white px-[15px] text-[#999] shadow-[0_2px_5px_rgba(0,0,0,0.1)] transition focus-within:border-[#5c3bc7] lg:w-[295px]">
           <input
             value={searchQuery}
             onChange={(e) => setSearchQuery(e.target.value)}
+            onKeyDown={(event) => {
+              if (event.key === "Enter") {
+                handleSubmitSearch();
+              }
+            }}
             placeholder={t("home.searchPlaceholder")}
             className="min-w-0 flex-1 bg-transparent text-[14px] outline-none placeholder:text-[#999]"
           />
+          {searchQuery ? (
+            <button
+              type="button"
+              onClick={handleClearSearch}
+              aria-label={t("common.clear")}
+              title={t("common.clear")}
+              className="mr-1 grid h-7 w-7 shrink-0 place-items-center rounded-full text-[#999] transition hover:bg-[#f0f0f0] hover:text-[#666]"
+            >
+              <CloseIcon />
+            </button>
+          ) : null}
+          <button
+            type="button"
+            onClick={handleSubmitSearch}
+            aria-label={t("home.searchPlaceholder")}
+            title={t("home.searchPlaceholder")}
+            className="grid h-7 w-7 shrink-0 place-items-center rounded-full text-[#999] transition hover:bg-[#f0f0f0] hover:text-[#5c3bc7]"
+          >
             <SearchIcon />
+          </button>
         </div>
       </div>
       <div className="grid gap-5 md:grid-cols-2 xl:grid-cols-4">