Add a page-level driver entry block below the customer login form on
the Login page (/login), so sub-users (drivers) can reach the driver
login on every viewport — especially mobile (<768px) where the
desktop sidebar layout makes the form's internal driver button hard
to discover.
- src/views/auth/Login.vue: Add `.driver-entry` block with a
router-link to {name: 'subuserlogin'}. Distinct color (#1584BC)
and truck icon, matching the LandingPage driver entry pattern.
Test IDs: login-driver-entry, login-driver-login-link.
Full-width on mobile (<768px) so it's impossible to miss.
- i18n: Add `auth.driver_login_help` to en, da, de, no, sv locale
files + global shared auth index. `auth.driver_login_button`
already existed in all locales.
- tests/unit/login-driver-entry.spec.js: Vitest tests verifying
the driver entry block, router-link, button label, help text,
and placement (not in sidebar).
Pleno Bugfix Bot