ui: Stores architecture improvements (#26910)

* refactor: Stores barrel imports + SSR gates

* refactor: Drop agenticStore wrapper exports

* refactor: Drop chatStore wrapper exports

* refactor: Drop modelsStore wrapper exports

* refactor: Drop serverStore wrapper exports

* refactor: Drop unused mcpStore wrapper exports

* refactor: Drop mcpResourceStore wrapper exports

* refactor: Drop conversationsStore wrapper exports + move buildConversationTree to utils

* refactor: Drop settingsStore wrapper exports

* refactor: Drop unused toolsStore wrapper exports

* refactor: Fix lint errors from store wrapper removal

* fix: Missing change

* refactor: Cleanup

* refactor: Context Stats store

tools/ui/src/lib/components/app/settings/SettingsChat/SettingsChat.svelte

@@ -20,10 +20,7 @@
 	import { setChatSettingsConfigContext } from '$lib/contexts';
 	import { ColorMode } from '$lib/enums/ui.enums';
 	import { RouterService } from '$lib/services/router.service';
-	import { modelsStore } from '$lib/stores/models.svelte';
-	import { isRouterMode } from '$lib/stores/server.svelte';
-	import { config, settingsStore } from '$lib/stores/settings.svelte';
-	import { settingsReferrer } from '$lib/stores/settings-referrer.svelte';
+	import { modelsStore, serverStore, settingsReferrer, settingsStore } from '$lib/stores';
 	import type { SettingsSection } from '$lib/types';
 	import { setMode } from 'mode-watcher';
 	import { fade } from 'svelte/transition';
@@ -43,14 +40,14 @@
 			SETTINGS_CHAT_SECTIONS[0]
 	);
 
-	let localConfig: SettingsConfigType = $state({ ...config() });
+	let localConfig: SettingsConfigType = $state({ ...settingsStore.config });
 
 	let mobileHeader: { updateCarousel: () => void } | undefined;
 
 	let fetchInitiated = false;
 
 	$effect(() => {
-		if (isRouterMode() && currentSection.fields && !fetchInitiated) {
+		if (serverStore.isRouterMode && currentSection.fields && !fetchInitiated) {
 			fetchInitiated = true;
 
 			void modelsStore
@@ -71,7 +68,7 @@
 	}
 
 	function handleReset() {
-		localConfig = { ...config() };
+		localConfig = { ...settingsStore.config };
 		setMode(localConfig.theme as ColorMode);
 		mobileHeader?.updateCarousel();
 	}
@@ -123,7 +120,7 @@
 	}
 
 	export function reset() {
-		localConfig = { ...config() };
+		localConfig = { ...settingsStore.config };
 	}
 
 	setChatSettingsConfigContext({