test(web): fix trivial assertion and add useInvalidateDefaultModel tests

Replace the no-provider test assertion from checking a nonexistent i18n
key to verifying actual warning keys are absent. Add unit tests for
useInvalidateDefaultModel following the useUpdateModelList pattern.

web/app/components/header/account-setting/model-provider-page/hooks.spec.ts

@@ -23,6 +23,7 @@ import {
   useAnthropicBuyQuota,
   useCurrentProviderAndModel,
   useDefaultModel,
+  useInvalidateDefaultModel,
   useLanguage,
   useMarketplaceAllPlugins,
   useModelList,
@@ -864,6 +865,38 @@ describe('hooks', () => {
     })
   })
 
+  describe('useInvalidateDefaultModel', () => {
+    it('should invalidate default model queries', () => {
+      const invalidateQueries = vi.fn()
+        ; (useQueryClient as Mock).mockReturnValue({ invalidateQueries })
+
+      const { result } = renderHook(() => useInvalidateDefaultModel())
+
+      act(() => {
+        result.current(ModelTypeEnum.textGeneration)
+      })
+
+      expect(invalidateQueries).toHaveBeenCalledWith({
+        queryKey: ['default-model', ModelTypeEnum.textGeneration],
+      })
+    })
+
+    it('should handle multiple model types', () => {
+      const invalidateQueries = vi.fn()
+        ; (useQueryClient as Mock).mockReturnValue({ invalidateQueries })
+
+      const { result } = renderHook(() => useInvalidateDefaultModel())
+
+      act(() => {
+        result.current(ModelTypeEnum.textGeneration)
+        result.current(ModelTypeEnum.textEmbedding)
+        result.current(ModelTypeEnum.rerank)
+      })
+
+      expect(invalidateQueries).toHaveBeenCalledTimes(3)
+    })
+  })
+
   describe('useAnthropicBuyQuota', () => {
     beforeEach(() => {
       Object.defineProperty(window, 'location', {

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

@@ -174,7 +174,8 @@ describe('ModelProviderPage', () => {
       })
 
       render(<ModelProviderPage searchText="" />)
-      expect(screen.queryByText('common.modelProvider.noProviderInstalled')).not.toBeInTheDocument()
+      expect(screen.queryByText('common.modelProvider.noneConfigured')).not.toBeInTheDocument()
+      expect(screen.queryByText('common.modelProvider.notConfigured')).not.toBeInTheDocument()
       expect(screen.getByText('common.modelProvider.emptyProviderTitle')).toBeInTheDocument()
     })