fix(web): skip top warning for no-provider state and remove unused i18n key

The empty state card below already prompts users to install a provider,
so the top warning bar is redundant for the no-provider case. Remove
the unused noProviderInstalled i18n key and replace the lookup map with
a ternary to preserve i18n literal types without assertions.

web/app/components/header/account-setting/model-provider-page/index.spec.tsx

@@ -161,7 +161,7 @@ describe('ModelProviderPage', () => {
   })
 
   describe('system model config status', () => {
-    it('should show no-provider warning when no configured providers exist', () => {
+    it('should not show top warning when no configured providers exist (empty state card handles it)', () => {
       mockProviders.splice(0, mockProviders.length, {
         provider: 'anthropic',
         label: { en_US: 'Anthropic' },
@@ -174,7 +174,8 @@ describe('ModelProviderPage', () => {
       })
 
       render(<ModelProviderPage searchText="" />)
-      expect(screen.getByText('common.modelProvider.noProviderInstalled')).toBeInTheDocument()
+      expect(screen.queryByText('common.modelProvider.noProviderInstalled')).not.toBeInTheDocument()
+      expect(screen.getByText('common.modelProvider.emptyProviderTitle')).toBeInTheDocument()
     })
 
     it('should show none-configured warning when providers exist but no default models set', () => {

web/app/components/header/account-setting/model-provider-page/index.tsx

@@ -23,12 +23,6 @@ import SystemModelSelector from './system-model-selector'
 
 type SystemModelConfigStatus = 'no-provider' | 'none-configured' | 'partially-configured' | 'fully-configured'
 
-const WARNING_TEXT_KEYS = {
-  'no-provider': 'modelProvider.noProviderInstalled',
-  'none-configured': 'modelProvider.noneConfigured',
-  'partially-configured': 'modelProvider.notConfigured',
-} as const
-
 type Props = {
   searchText: string
 }
@@ -94,10 +88,13 @@ const ModelProviderPage = ({ searchText }: Props) => {
       return 'partially-configured'
     return 'fully-configured'
   }, [configuredProviders, textGenerationDefaultModel, embeddingsDefaultModel, rerankDefaultModel, speech2textDefaultModel, ttsDefaultModel])
-  const showWarning = !isDefaultModelLoading && systemModelConfigStatus !== 'fully-configured'
-  const warningTextKey = systemModelConfigStatus !== 'fully-configured'
-    ? WARNING_TEXT_KEYS[systemModelConfigStatus]
-    : undefined
+  const warningTextKey
+    = systemModelConfigStatus === 'none-configured'
+      ? 'modelProvider.noneConfigured'
+      : systemModelConfigStatus === 'partially-configured'
+        ? 'modelProvider.notConfigured'
+        : null
+  const showWarning = !isDefaultModelLoading && !!warningTextKey
 
   const [filteredConfiguredProviders, filteredNotConfiguredProviders] = useMemo(() => {
     const filteredConfiguredProviders = configuredProviders.filter(

web/i18n/en-US/common.json

@@ -390,7 +390,6 @@
   "modelProvider.models": "Models",
   "modelProvider.modelsNum": "{{num}} Models",
   "modelProvider.noModelFound": "No model found for {{model}}",
-  "modelProvider.noProviderInstalled": "No model provider installed. Install one to configure system models.",
   "modelProvider.noneConfigured": "Configure a default system model to run applications",
   "modelProvider.notConfigured": "The system model has not yet been fully configured",
   "modelProvider.parameters": "PARAMETERS",

web/i18n/zh-Hans/common.json

@@ -390,7 +390,6 @@
   "modelProvider.models": "模型列表",
   "modelProvider.modelsNum": "{{num}} 个模型",
   "modelProvider.noModelFound": "找不到模型 {{model}}",
-  "modelProvider.noProviderInstalled": "尚未安装模型供应商，请先安装以配置系统模型。",
   "modelProvider.noneConfigured": "配置默认系统模型以运行应用",
   "modelProvider.notConfigured": "系统模型尚未完全配置",
   "modelProvider.parameters": "参数",