[FE-32] Google OAuth: login and register page integration

[yusuftomilola]

Overview

Frontend login and register pages need a Continue with Google button that initiates the OAuth redirect and handles the callback token, so members can use Google sign-in end-to-end.

Context

• Login page: frontend/app/(auth)/login/page.tsx
• Register page: frontend/app/(auth)/register/page.tsx
• Zustand auth store: frontend/lib/store/authStore.ts
• Depends on BE-35 being implemented first

Tasks

• Add a Continue with Google button (Google-branded: white background, Google logo SVG, Sign in with Google text per branding guidelines) to both login and register pages
• Button redirects to GET /auth/google (backend initiates OAuth)
• Create /auth/oauth/callback Next.js page that reads ?token= and ?refreshToken= from URL, stores them in authStore, then redirects to /dashboard
• If callback contains ?error=, show an error toast and redirect back to /login
• Show a visual divider (--- or ---) between email/password form and Google button

Files to Modify / Create

• frontend/app/(auth)/login/page.tsx
• frontend/app/(auth)/register/page.tsx
• New: frontend/app/(auth)/oauth/callback/page.tsx

[annacodervibe]

@annacodervibe has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would like to work on this issue. I have experience with Rust and Soroban smart contract development. I will follow the acceptance criteria and add tests. Excited to contribute. Kindly assign.

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[lynaDev2]

@lynaDev2 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

can i work on this

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[grantfox-oss]

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@lynaDev2's PR #1265 was approved and merged by @yusuftomilola.

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👏 Great work, @lynaDev2! Keep contributing to DistinctCodes.

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