webui: Improvements for Models Selector UI (#20066)

tools/server/webui/src/routes/+layout.svelte

@@ -14,7 +14,7 @@
 	import { Toaster } from 'svelte-sonner';
 	import { goto } from '$app/navigation';
 	import { modelsStore } from '$lib/stores/models.svelte';
-	import { TOOLTIP_DELAY_DURATION } from '$lib/constants/tooltip-config';
+	import { TOOLTIP_DELAY_DURATION } from '$lib/constants';
 	import { KeyboardKey } from '$lib/enums';
 	import { IsMobile } from '$lib/hooks/is-mobile.svelte';
 

tools/server/webui/src/routes/+page.svelte

@@ -3,6 +3,7 @@
 	import { chatStore } from '$lib/stores/chat.svelte';
 	import { conversationsStore, isConversationsInitialized } from '$lib/stores/conversations.svelte';
 	import { modelsStore, modelOptions } from '$lib/stores/models.svelte';
+	import { isRouterMode } from '$lib/stores/server.svelte';
 	import { onMount } from 'svelte';
 	import { page } from '$app/state';
 	import { replaceState } from '$app/navigation';
@@ -71,6 +72,14 @@
 		conversationsStore.clearActiveConversation();
 		chatStore.clearUIState();
 
+		if (
+			isRouterMode() &&
+			modelsStore.selectedModelName &&
+			!modelsStore.isModelLoaded(modelsStore.selectedModelName)
+		) {
+			modelsStore.clearSelection();
+		}
+
 		// Handle URL params only if we have ?q= or ?model= or ?new_chat=true
 		if (qParam !== null || modelParam !== null || newChatParam === 'true') {
 			await handleUrlParams();

tools/server/webui/src/routes/chat/[id]/+page.svelte

@@ -99,10 +99,12 @@
 			(option) => option.model === lastMessageWithModel.model
 		);
 
-		if (matchingModel) {
+		if (matchingModel && modelsStore.isModelLoaded(matchingModel.model)) {
 			try {
 				await modelsStore.selectModelById(matchingModel.id);
-				console.log(`Automatically loaded model: ${lastMessageWithModel.model} from last message`);
+				console.log(
+					`Automatically selected model: ${lastMessageWithModel.model} from last message`
+				);
 			} catch (error) {
 				console.warn('Failed to automatically select model from last message:', error);
 			}