test(e2e): add critical flow sanity suite

[cameroncuster]

Summary

• add a fast test:sanity selector for the most critical authentication and submission journeys
• exercise the actual mocked GitHub OAuth redirect and callback, persisted admin session, admin submit access, logout revocation, and anonymous post-logout denial
• include successful Codeforces and Kattis writes in the sanity set
• extend the deterministic Supabase mock with OAuth authorize, user lookup, token refresh, logout, and admin-role behavior
• retain the complete desktop/mobile Playwright suite as the required merge gate, including explicit member and anonymous authorization denials

Test isolation

All identities, tokens, role records, provider responses, and inserts are deterministic test fixtures. Writes land only in the mock server's resettable in-memory store; no real OAuth, provider, Supabase credential, or production data is used.

Verification

• pnpm run test:sanity: 6/6 passed
• formatting passed
• ESLint passed
• Svelte check passed
• unit tests: 199/199 passed
• production build passed
• full desktop/mobile Playwright suite: 151 passed, 5 intentional live-only skips
• git diff --check passed

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Pull Request opened by Augment Code | View session

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Project	Deployment	Actions	Updated (UTC)
gitgud	Ready	Preview, Comment	Jul 23, 2026 11:16pm