fix: UI single model selection in router mode (#19767)

tools/server/webui/src/lib/components/app/models/ModelsSelector.svelte

@@ -251,9 +251,6 @@
 			return options.find((option) => option.id === activeId);
 		}
 
-		if (options.length === 1) {
-			return options[0];
-		}
 		// No selection - return undefined to show "Select model"
 		return undefined;
 	}

tools/server/webui/src/lib/stores/models.svelte.ts

@@ -306,6 +306,16 @@ class ModelsStore {
 			const response = await ModelsService.listRouter();
 			this.routerModels = response.data;
 			await this.fetchModalitiesForLoadedModels();
+
+			const o = this.models.filter((option) => {
+				const modelProps = this.getModelProps(option.model);
+
+				return modelProps?.webui !== false;
+			});
+
+			if (o.length === 1 && this.isModelLoaded(o[0].model)) {
+				this.selectModelById(o[0].id);
+			}
 		} catch (error) {
 			console.warn('Failed to fetch router models:', error);
 			this.routerModels = [];