first commit

src/components/common/base/DropdownPanel.svelte

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+<script lang="ts">
+/**
+ * 公共下拉面板组件 (Svelte 5 版本)
+ * 用于壁纸切换、亮暗色切换等下拉面板
+ */
+import type { Snippet } from "svelte";
+
+interface Props {
+	class?: string;
+	children?: Snippet;
+}
+
+let { class: className = "", children, ...restProps }: Props = $props();
+</script>
+
+<div class={`card-base float-panel p-2 ${className}`.trim()} {...restProps}>
+	{#if children}
+		{@render children()}
+	{/if}
+</div>