Implemented global 401 response handling to properly redirect users
to login when their session expires:
Changes:
frontend/src/api/client.ts: Added setAuthErrorHandler() callback
pattern and enhanced 401 interceptor to notify auth context
frontend/src/context/AuthContext.tsx: Register auth error handler
that clears state and redirects to /login on 401 responses
tests/core/authentication.spec.ts: Fixed test to clear correct
localStorage key (charon_auth_token)
The implementation uses a callback pattern to avoid circular
dependencies while keeping auth state management centralized.
Auth endpoints (/auth/login, /auth/me) are excluded from the
redirect to prevent loops during initial auth checks.
All 16 authentication E2E tests now pass including:
should redirect to login when session expires
should handle 401 response gracefully
Closes frontend-auth-guard-reload.md
Fixed TEST issues (5 tests):
proxy-hosts.spec.ts: Added dismissDomainDialog() helper to handle
"New Base Domain Detected" modal before Save button clicks
auth-fixtures.ts: Updated logoutUser() to use text-based selector
that matches emoji button (🚪 Logout)
authentication.spec.ts: Added wait time for 401 response handling
to allow UI to react before assertion
Tracked CODE issue (1 test):
Created frontend-auth-guard-reload.md for session
expiration redirect failure (requires frontend code changes)
Test results: 247/252 passing (98% pass rate)
Before fixes: 242/252 (96%)
Improvement: +5 tests, +2% pass rate
Part of E2E testing initiative per Definition of Done
