Refactor Mihomo proxy groups component to improve loading state management

- Introduced `untrack` from Svelte to prevent infinite rendering loops during loading state changes.
- Enhanced loading state handling by ensuring that loading notifications are managed correctly without causing UI flickering.
- Improved overall data fetching logic for better user experience during proxy updates.

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

@@ -1,4 +1,5 @@
 <script lang="ts">
+	import { untrack } from 'svelte';
 	import { ApiError, fetchMihomoJson, mihomoPut } from '$lib/api/client.js';
 	import type { MihomoProxiesResponse, MihomoProxyEntry } from '$lib/api/mihomo-types.js';
 	import { Button } from '$lib/components/ui/button/index.js';
@@ -45,8 +46,10 @@
 	async function loadProxies() {
 		const a = alias;
 		if (!a) return;
+		const notify = onLoadingChange;
 		proxiesLoading = true;
-		onLoadingChange?.(true);
+		// Иначе $effect подпишется на проп-колбэк: новая fn каждый рендер родителя → бесконечный цикл /proxies
+		untrack(() => notify?.(true));
 		proxiesErr = null;
 		try {
 			proxiesData = await fetchMihomoJson<MihomoProxiesResponse>(a, 'proxies');
@@ -55,7 +58,7 @@
 			// не затираем успешный снимок при сбое обновления — без мерцания UI
 		} finally {
 			proxiesLoading = false;
-			onLoadingChange?.(false);
+			untrack(() => notify?.(false));
 		}
 	}