- Fix all 6 pictogram icons by switching to pictogram-topic-* namespace and importing pictograms-mapper.scss with its required mixins
- Add lottie-web dependency and lottieFile prop to topic teaser component
- Size lottie container to match pictogram icon dimensions (72/50px) and inherit --color-decoration via currentColor on SVG paths
- Expose stories/assets/lottie as /lottie static dir in Storybook

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

- @storybook/addon-vitest (inkl. Playwright Chromium + Coverage-V8)
- @storybook/addon-a11y für Barrierefreiheitsprüfungen
- @chromatic-com/storybook für visuelle Regressionstests
- vitest.config.ts erstellt (Storybook-Testprojekt mit Playwright-Browser)

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