feat: 添加返回顶部悬浮控制器并调整管理后台容器宽度

src/routes/admin/+layout.svelte

@@ -32,6 +32,9 @@
 	function handleOverlayClick() {
 		isMobileSidebarOpen = false;
 	}
+	function scrollToTop() {
+		window.scrollTo({ top: 0, behavior: 'smooth' });
+	}
 </script>
 
 <svelte:head>
@@ -177,6 +180,34 @@
 <Toast />
 <ConfirmDialog />
 
+<!-- Floating Controllers (VOID style) -->
+<aside id="ctrler-panel">
+	<div class="ctrler-item" title="返回顶部">
+		<a
+			href="#top"
+			aria-label="返回顶部"
+			onclick={(e) => {
+				e.preventDefault();
+				scrollToTop();
+			}}
+		>
+			<svg
+				aria-hidden="true"
+				focusable="false"
+				role="img"
+				xmlns="http://www.w3.org/2000/svg"
+				viewBox="0 0 448 512"
+				width="16"
+				height="16"
+				><path
+					fill="currentColor"
+					d="M34.9 289.5l-22.2-22.2c-9.4-9.4-9.4-24.6 0-33.9L207 39c9.4-9.4 24.6-9.4 33.9 0l194.3 194.3c9.4 9.4 9.4 24.6 0 33.9L413 289.4c-9.5 9.5-25 9.3-34.3-.4L264 168.6V456c0 13.3-10.7 24-24 24h-32c-13.3 0-24-10.7-24-24V168.6L69.2 289.1c-9.3 9.8-24.8 10-34.3.4z"
+				></path></svg
+			>
+		</a>
+	</div>
+</aside>
+
 <style>
 	:global(body) {
 		margin: 0;
@@ -363,7 +394,7 @@
 	}
 
 	.admin-container {
-		max-width: 1440px;
+		max-width: 1280px;
 		margin: 0 auto;
 	}