- Narrow :has() selector in button hover to direct child (> .teaser--link)
- Scope slider-tabs .count hide rule to specific components instead of generic .controls
- Fix header.js nav selector to target nav .primary
- Correct marketing header autoplay speed from 700000ms to 7000ms, trigger handleAutoplay()
- Fix slider-tabs positioning with left: auto and transform: none

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Webpack → Vite (Startzeit: mehrere Minuten → ~300ms)
Sass Deprecation Warnings beseitigt (@import → @use as *, 93 Dateien)
require() → ESM import in 8 JS-Dateien
package.json von ~35 auf 6 devDependencies bereinigt