Persist active provider profile across restarts (#833)

* Persist active provider profile across restarts

* Clear stale startup provider overrides

* Fix provider profile restart fallback

* Fix provider profile restart fallback

* Omit empty OpenAI API key from startup env

* Fix startup override settings typing

src/utils/providerStartupOverrides.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, mock, test } from 'bun:test'
+
+import { clearStartupProviderOverrides } from './providerStartupOverrides.js'
+
+describe('clearStartupProviderOverrides', () => {
+  test('removes stale provider env from user settings and global config env', () => {
+    const updateUserSettings = mock(() => ({ error: null }))
+    const saveConfig = mock((updater: (current: {
+      env: Record<string, string>
+    }) => { env: Record<string, string> }) =>
+      updater({
+        env: {
+          CLAUDE_CODE_USE_OPENAI: '1',
+          OPENAI_BASE_URL: 'https://api.minimax.io/v1',
+          OPENAI_MODEL: 'minimax-m2.7',
+          MINIMAX_API_KEY: 'sk-minimax',
+          KEEP_ME: '1',
+        },
+      }),
+    )
+
+    const error = clearStartupProviderOverrides({
+      updateUserSettings,
+      saveConfig,
+    })
+
+    expect(error).toBeNull()
+    expect(updateUserSettings).toHaveBeenCalledWith(
+      'userSettings',
+      expect.objectContaining({
+        env: expect.objectContaining({
+          CLAUDE_CODE_USE_OPENAI: undefined,
+          OPENAI_BASE_URL: undefined,
+          OPENAI_MODEL: undefined,
+          MINIMAX_API_KEY: undefined,
+        }),
+      }),
+    )
+    expect(saveConfig.mock.results[0]?.value.env).toEqual({ KEEP_ME: '1' })
+  })
+})