Login page:
- Email/phone tabs with auto-detect from input
- Calls LogInWithEmail or LogInWithPhoneNumber API
- On 206 (Partial Content): shows OTP step, sends OTP, then verifies
- On 200: stores JWT in localStorage, decodes user info
- OTP step with resend button and back navigation
- Console logs throughout all auth flows
API client:
- Added authFetch() for raw status code handling (200/206)
- Added loginWithEmail, loginWithPhone, sendEmailOTP, sendPhoneOTP,
verifyEmail, verifyPhone, isEmail, isPhoneNumber
- apiFetch now accepts 206 as non-error
