Fix login-screen UX: resend countdown, validation, demo-code mask, phone layout (T3: AUTH-03, 04, 05, 09, 10, 11, 12, 14, VS-02, AX-06)

Fix login-screen UX: resend countdown, validation, demo-code mask, phone layout (T3: AUTH-03, 04, 05, 09, 10, 11, 12, 14, VS-02, AX-06) #857