Add prominent logout button to all dashboard views (main, edit, deactivate)
showing logged-in user name and "Abmelden" (logout) option.
- Header displays "Angemeldet als: [Name]" with logout button
- Logout redirects back to /anbieter-login/ page
- Responsive design: stacks on mobile screens
- Consistent styling across all dashboard views
Fixes Issue 1 from Phase 7 testing: No logout option visible.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Viktor Miller
98487eb05b