fix(auth): restore Google sign-in retry state

[groupthinking]

Canonical issue

No GitHub issue applies. The canonical sprint task is Notion: Fix login bug.

Outcome

A rejected or non-navigating Google sign-in initiation restores an enabled Continue with Google button and announces a generic, non-sensitive error. A browser navigation handoff remains protected against duplicate submission.

Scope

• Included:
  • Local retry and generic error state in GoogleSignInButton.
  • Focused jsdom coverage for rejection, non-navigation, retry, generic error handling, and in-flight duplicate-click prevention.
• Explicitly excluded:
  • OAuth credentials and provider configuration, callback-path sanitization, NextAuth route policy, proxy policy, deployment, logging, and production authentication flows.

Risk

• Risk level: medium
• Failure mode: A navigation handoff that resolves without changing window.location.href could be shown as retryable instead of pending.
• Rollback: Revert de2994fbe809c85f2543efecfaf741e2a9233eb9.

Verification

Validation performed against the content committed at de2994fbe809c85f2543efecfaf741e2a9233eb9:

• Focused test: npm --workspace=eventrelay-web run test -- src/app/login/GoogleSignInButton.test.tsx — 3 tests passed.
• Full frontend suite: npx turbo run test --force — 128 files passed; 1,216 tests passed and 27 skipped.
• Type check: npm --workspace=eventrelay-web run type-check.
• Lint: npm --workspace=eventrelay-web run lint — 0 errors; 3 existing warnings in unrelated components.
• git diff --cached --check and a staged credential-pattern scan before commit.
• Backend test command: pytest tests/ could not start because the checkout has no pytest executable or local virtual environment. This frontend-only change does not alter backend code.
• Required GitHub CI on the published head.
• Review threads resolved.

Production evidence

Not applicable. This draft changes client-side recovery state and does not deploy, access production credentials, or perform a real Google sign-in.

Agent handoff

• A canonical Notion task is linked; no GitHub issue applies.
• Competing drafts exist: #1971 and #1973 implement the same behavior. This draft was opened at explicit request for a direct comparison.
• Local acceptance criteria are covered by the scoped implementation and focused tests.
• Required checks pass on the published head.
• No product, security, irreversible infrastructure, or production approval is requested.

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Project	Deployment	Actions	Updated
v0-uvai	Canceled	v0	Sep 17, 2026 4:37am UTC

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[groupthinking]

Closing as a duplicate of #1973. Both drafts implement the same scoped Google sign-in retry recovery; #1973 has the stronger retry-state coverage and a clean completed CI run.