feat: show error when not select required model

web/i18n/en-US/workflow.ts

@@ -735,6 +735,7 @@ const translation = {
       strategyNotSet: 'Agentic strategy Not Set',
       tools: 'Tools',
       maxIterations: 'Max Iterations',
+      modelNotSelected: 'Model not selected',
       modelNotInstallTooltip: 'This model is not installed',
       toolNotInstallTooltip: '{{tool}} is not installed',
       toolNotAuthorizedTooltip: '{{tool}} Not Authorized',

web/i18n/zh-Hans/workflow.ts

@@ -736,6 +736,7 @@ const translation = {
       tools: '工具',
       maxIterations: '最大迭代次数',
       modelNotInstallTooltip: '此模型未安装',
+      modelNotSelected: '未选择模型',
       toolNotInstallTooltip: '{{tool}} 未安装',
       toolNotAuthorizedTooltip: '{{tool}} 未授权',
       strategyNotInstallTooltip: '{{strategy}} 未安装',