feat(ui): refine search input focus states

app/(main)/page.tsx

@@ -72,7 +72,7 @@ export default function HomePage() {
                 type="text"
                 name="q"
                 placeholder="搜索陪玩、店铺、游戏..."
-                className="w-full border-border bg-card shadow-sm transition-shadow focus-visible:shadow-md"
+                className="w-full border-border bg-card shadow-sm transition-colors focus-visible:border-primary"
               />
             </form>
           </div>

app/(main)/search/page.tsx

@@ -567,7 +567,7 @@ function SearchPageContent() {
               icon={<Search />}
               type="search"
               placeholder="搜索陪玩、游戏、标签..."
-              className="border-border bg-card shadow-sm transition-shadow focus-visible:shadow-md"
+              className="border-border bg-card shadow-sm transition-colors focus-visible:border-primary"
               value={searchQuery}
               onChange={(e) => setSearchQuery(e.target.value)}
             />