Fix OAuth sign-in app state handling

[CheFu-code]

Motivation

• The OAuth sign-in flow could be cancelled when the external auth browser backgrounds the app, invalidating the in-flight handshake and breaking sign-in completion.
• AppState transitions were unconditionally starting a new auth operation which conflicted with an active external prompt.
• Preserve the pending OAuth operation while the system browser is active so the redirect result can be processed correctly.

Description

• Add an authPromptActiveRef flag to useQuantumAuth and set it while startQuantumSignIn() is in progress to mark the OAuth prompt as active.
• Short-circuit the AppState change listener when authPromptActiveRef.current is true to avoid cancelling an in-flight sign-in when the app backgrounds.
• Clear the flag in both the success and catch paths to ensure the app resumes normal AppState handling after the prompt finishes.
• Add a regression test keeps the OAuth operation alive while the auth browser backgrounds the app to src/hooks/__tests__/useQuantumAuth.test.tsx that mocks AppState and verifies completion and persistence of the session.

Testing

• Ran the focused unit tests with npm test -- useQuantumAuth.test.tsx --runInBand, which passed (4 passed, 4 total).
• Ran the TypeScript check with npm run typecheck, which succeeded.
• Ran the linter with npm run lint (expo lint), which completed without errors.

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Codex Task

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 994aec1a-0b69-476b-bdd6-fb840d3a41b5

📥 Commits

Reviewing files that changed from the base of the PR and between dc490ac and 335a62d.

📒 Files selected for processing (2)

• src/hooks/__tests__/useQuantumAuth.test.tsx
• src/hooks/useQuantumAuth.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-signing-implementation-issue

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore after canceled OAuth prompts

When sign-in is started while the initial restoreStoredSession() is still pending (the app opens login for any status other than authenticated) and the user cancels or dismisses the browser, this early return also suppresses the active transition that used to reload SecureStore. The cancel path then falls back to the stale session captured before restore, often null, leaving an existing valid stored session shown as guest until another app-state cycle or restart.

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