Enhance Mihomo overview charts component with improved theming and chart management

- Integrated dynamic theming for chart colors using a centralized theme file, enhancing visual consistency across charts.
- Refactored chart initialization logic to ensure proper destruction and recreation of charts on data updates, improving performance and responsiveness.
- Updated chart options to utilize theme colors for grid, ticks, and legends, providing a more cohesive user experience.

web/src/lib/components/data-table/data-table-toolbar.svelte

@@ -0,0 +1,21 @@
+<script lang="ts">
+	import { cn } from '$lib/utils.js';
+	import type { Snippet } from 'svelte';
+
+	let {
+		class: className,
+		children
+	}: {
+		class?: string;
+		children: Snippet;
+	} = $props();
+</script>
+
+<div
+	class={cn(
+		'flex flex-wrap items-center justify-between gap-2 border-b border-border bg-muted/30 px-3 py-2',
+		className
+	)}
+>
+	{@render children()}
+</div>