feat: Login/Auth/i18n: TDD implementation with post-login UX fixes

[Copilot]

Adds full authentication flow, bilingual support (PT-BR/EN-US), and post-login UX improvements to DataForgeTest following strict TDD (Red → Green → Refactor).

Auth & Session (Backend + Frontend)

• POST /api/auth/validate Flask blueprint — 200/401/400; password_hash never leaves the server
• authStorage.js — localStorage session with 8h/7d (rememberMe) expiry; passwordHash never persisted
• data/users.js — in-memory user store (3 demo accounts); migration path to API documented inline
• useAuth.js — handleLogin with 1200ms simulated latency + bilingual error objects { 'pt-BR': '...', 'en-US': '...' }

Routing & Protection

• ProtectedRoute — three states: loading spinner → /login + state.from (unauthenticated) → /login + state.step (no profile) → children
• App.js — /login public; all other routes wrapped in <ProtectedRoute>; SupportButton hidden on /login
• index.js — <LanguageProvider><AuthProvider><App />

i18n

• LanguageContext — useLanguage() hook, persists to localStorage('dataforgetest_language')
• LanguageToggle — PT-BR/EN-US toggle with data-testid="language-toggle"; size='sm'|'md'
• MethodologyPage migrated from local useState('pt-BR') to global useLanguage()
• commonTranslations.js — shared keys (backToHome, loading, etc.) for internal pages

LoginPage

Full-page component: AnimatedBackground (25 floating tech-label nodes), two-step machine (login → profile), 8 role cards, right panel with pipeline + stats. Live detection feed removed — the setInterval AnimatePresence feed caused page-jump artifacts on every 3s update with no real data value.

HomePage Additions

• HomeHeader — sticky top bar with logo, translated nav links, LanguageToggle, user avatar/name, logout
• HomeFooter — copyright, tech stack, version; translations shared with LoginPage footer
• All hero/section/button text driven by translations[language]

Tests

7 new test files (TDD commit 1), then implementation (commit 2). Updated App.test.js and MethodologyPage.test.js for new context providers. 502 frontend tests passing.

Note: frontend/src/data/users.js required a .gitignore exception — root data/ glob was silently excluding it. src/auth/ uses werkzeug password hashing; useAuth.js has a TODO comment marking the swap point from REGISTERED_USERS to fetch('/api/auth/validate').

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Project	Deployment	Actions	Updated (UTC)
data-forge-test	Ready	Preview, Comment	Mar 20, 2026 3:20am
smart-data-test	Ready	Preview, Comment	Mar 20, 2026 3:20am

[github-actions]

🧪 PR Test Summary

Suite	Status
Backend — Unit	✅ success
Backend — API	✅ success
Backend — Security	✅ success
Frontend — Coverage	✅ success

Coverage thresholds: Statements 80% · Branches 70% · Functions 75% · Lines 80%

📦 View artifacts

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
1373	1188	87%	80%	🟢

New Files

File	Coverage	Status
frontend/src/components/LanguageToggle.js	100%	🟢
frontend/src/components/ProtectedRoute.js	100%	🟢
frontend/src/context/AuthContext.js	100%	🟢
frontend/src/context/LanguageContext.js	100%	🟢
frontend/src/data/users.js	100%	🟢
frontend/src/hooks/useAuth.js	100%	🟢
frontend/src/hooks/useStats.js	100%	🟢
frontend/src/pages/LoginPage.js	100%	🟢
frontend/src/utils/authStorage.js	100%	🟢
frontend/src/utils/commonTranslations.js	100%	🟢
TOTAL	100%	🟢

Modified Files

File	Coverage	Status
frontend/src/App.js	100%	🟢
frontend/src/components/HomePage.js	93%	🟢
frontend/src/pages/MethodologyPage.js	83%	🟢
frontend/src/styles/animations.js	100%	🟢
TOTAL	94%	🟢

updated for commit: e087bac by action🐍