fix(providers): keep add-provider flow selected during sync

packages/ui/src/stores/useConfigStore.test.ts

@@ -408,6 +408,31 @@ describe('useConfigStore provider persistence', () => {
     expect(useConfigStore.getState().selectedProviderId).toBe('__add_provider__');
   });
 
+  test('add-provider sentinel is not persisted as a stable provider selection', async () => {
+    useConfigStore.setState({
+      activeDirectoryKey: DIRECTORY,
+      currentProviderId: 'live',
+      currentModelId: 'live-model',
+      selectedProviderId: '__add_provider__',
+      directoryScoped: {
+        [DIRECTORY]: {
+          providers: [provider('live')],
+          agents: [],
+          currentProviderId: 'live',
+          currentModelId: 'live-model',
+          currentAgentName: undefined,
+          selectedProviderId: '__add_provider__',
+          agentModelSelections: {},
+          defaultProviders: { default: 'live' },
+        },
+      },
+    });
+
+    const persisted = JSON.parse(storage.get(STORAGE_KEY) ?? '{}');
+    expect(persisted.state.selectedProviderId).toBe('');
+    expect(persisted.state.directoryScoped[DIRECTORY].selectedProviderId).toBe('');
+  });
+
   test('setAgent applies settings default variant for an agent configured model', () => {
     useSessionUIStore.setState({ currentSessionId: 'ses_agent_default_variant' });
     useConfigStore.setState({
@@ -603,6 +628,47 @@ describe('useConfigStore provider persistence', () => {
     expect(state.currentAgentName).toBe('review');
   });
 
+  test('sync config defaults do not close the add-provider settings flow', () => {
+    useConfigStore.setState({
+      activeDirectoryKey: DIRECTORY,
+      providers: [provider('openai', 'gpt-5.5'), provider('anthropic', 'claude')],
+      agents: [
+        testAgent('build', { model: { providerID: 'anthropic', modelID: 'claude' } }),
+        testAgent('review', { model: { providerID: 'openai', modelID: 'gpt-5.5' } }),
+      ],
+      currentProviderId: 'anthropic',
+      currentModelId: 'claude',
+      currentAgentName: 'build',
+      selectedProviderId: '__add_provider__',
+      selectionSource: 'auto',
+      directoryScoped: {
+        [DIRECTORY]: {
+          providers: [provider('openai', 'gpt-5.5'), provider('anthropic', 'claude')],
+          agents: [
+            testAgent('build', { model: { providerID: 'anthropic', modelID: 'claude' } }),
+            testAgent('review', { model: { providerID: 'openai', modelID: 'gpt-5.5' } }),
+          ],
+          currentProviderId: 'anthropic',
+          currentModelId: 'claude',
+          currentAgentName: 'build',
+          selectedProviderId: '__add_provider__',
+          agentModelSelections: {},
+          defaultProviders: {},
+          selectionSource: 'auto',
+        },
+      },
+    });
+
+    emitSyncConfigChanged(DIRECTORY, { default_agent: 'review', model: 'openai/gpt-5.5' });
+
+    const state = useConfigStore.getState();
+    expect(state.currentAgentName).toBe('review');
+    expect(state.currentProviderId).toBe('openai');
+    expect(state.currentModelId).toBe('gpt-5.5');
+    expect(state.selectedProviderId).toBe('__add_provider__');
+    expect(state.directoryScoped[DIRECTORY]?.selectedProviderId).toBe('__add_provider__');
+  });
+
   test('duplicate sync config event is a no-op when defaults and selection are unchanged', () => {
     useConfigStore.setState({
       activeDirectoryKey: DIRECTORY,