- Resolve all merge conflicts from main branch pull
- Fix CSS load order: global stylesheet before page-specific on all pages
- Add navigation.js to impressum.html and datenschutz.html
- Unify nav classes across all pages (nav-tab-links + button-small)
- Add footer styles to global stylesheet
- Remove duplicate landingpage.css (redundant with index.css)
- Fix duplicate head/body tags in event_detail.html
- Merge login.js: keep user auth logic + snackbar support
- Merge index-carousel.js: keep dots + responsive resize handling
