Enhance Mihomo proxy groups component with improved data handling and UI updates

- Introduced a stable order for selectable proxy groups to minimize DOM changes during JSON updates.
- Added a refresh icon to the update button for better user feedback during loading states.
- Enhanced error handling to prevent UI flickering when fetching proxy data.
- Updated layout in the Mihomo page to utilize a grid system for better responsiveness and organization.

web/src/lib/components/mihomo/mihomo-proxy-groups.svelte

@@ -6,6 +6,7 @@
 	import DataQueryState from '$lib/components/fleet/data-query-state.svelte';
 	import { Skeleton } from '$lib/components/ui/skeleton/index.js';
 	import { cn } from '$lib/utils.js';
+	import RefreshCwIcon from '@lucide/svelte/icons/refresh-cw';
 
 	let {
 		alias,
@@ -39,8 +40,8 @@
 		try {
 			proxiesData = await fetchMihomoJson<MihomoProxiesResponse>(a, 'proxies');
 		} catch (e) {
-			proxiesData = null;
 			proxiesErr = e instanceof ApiError ? e.message : String(e);
+			// не затираем успешный снимок при сбое обновления — без мерцания UI
 		} finally {
 			proxiesLoading = false;
 		}
@@ -59,6 +60,15 @@
 		return false;
 	}
 
+	/** Стабильный порядок групп — меньше скачков DOM при обновлении JSON. */
+	let selectableGroups = $derived.by((): [string, MihomoProxyEntry][] => {
+		const p = proxiesData?.proxies;
+		if (!p) return [];
+		return Object.entries(p)
+			.filter(([_, v]) => isSelectableGroup(v))
+			.sort(([a], [b]) => a.localeCompare(b));
+	});
+
 	function lastDelay(p: MihomoProxyEntry): number | null {
 		const h = p.history;
 		if (!h?.length) return null;
@@ -139,11 +149,20 @@
 		onclick={() => loadProxies()}
 		disabled={proxiesLoading || !alias}
 	>
+		<RefreshCwIcon
+			class={cn('mr-1 size-3.5 shrink-0', proxiesLoading && 'animate-spin')}
+			aria-hidden="true"
+		/>
 		Обновить
 	</Button>
 </div>
 
-<DataQueryState err={proxiesErr} showSkeleton={proxiesLoading} isEmpty={false}>
+<DataQueryState
+	err={proxiesErr}
+	hasStaleData={proxiesData != null && proxiesErr != null}
+	showSkeleton={proxiesLoading && proxiesData === null}
+	isEmpty={false}
+>
 	{#snippet skeleton()}
 		{#if compact}
 			<div class="flex flex-wrap gap-1">
@@ -162,7 +181,7 @@
 	{#snippet children()}
 		{#if proxiesData?.proxies}
 			<div class={cn('flex flex-col', compact ? 'gap-3' : 'gap-8')}>
-				{#each Object.entries(proxiesData.proxies).filter(([_, v]) => isSelectableGroup(v)) as [gName, group] (gName)}
+				{#each selectableGroups as [gName, group] (gName)}
 					{#if compact}
 						<div class="bg-muted/20 rounded-lg border px-2 py-2 sm:px-3">
 							<div class="mb-1.5 flex flex-wrap items-center justify-between gap-x-2 gap-y-1">

web/src/routes/mihomo/+page.svelte

@@ -329,12 +329,14 @@
 						Список групп подгружается автоматически. Клик по ячейке — выбор узла; «ping» — задержка.
 					</p>
 				</div>
-				<div class="flex flex-col gap-3">
+				<div
+					class="grid grid-cols-1 gap-3 md:grid-cols-2 xl:grid-cols-3"
+				>
 					{#each rows.filter((r) => r.metaStatus === 'ok') as r (r.alias)}
 						<Card.Root
 							id="mihomo-proxies-{encodeURIComponent(r.alias)}"
 							data-size="sm"
-							class="border-l-4 border-l-primary/30 scroll-mt-20 shadow-sm"
+							class="border-l-4 border-l-primary/30 min-h-0 min-w-0 scroll-mt-20 shadow-sm"
 						>
 							<Card.Header class="space-y-0 pb-1 pt-3">
 								<Card.Title class="text-sm font-semibold">{r.alias}</Card.Title>