v2: light editorial redesign, bilingual (EN-first), preview, front matter, PWA

Design (design-taste-frontend + ui-ux-design-pro + impeccable):
- Warm, flat, light editorial theme (OKLCH), Geist + Geist Mono, single vermilion accent
- Dark mode toggle, persisted; respects prefers-color-scheme
- Prominent focus rings, tactile states, reduced-motion

Features (GitHub-ready):
- i18n EN/DE, English default, persisted
- Live split preview (marked + DOMPurify, sanitized)
- Optional YAML front matter (title/date/source/tags), rendered as metadata block
- Conversion options: links as text, strip images, bullet marker, heading style
- Filename patterns (title+date / date+time), auto/custom indicator
- Drag & drop .html/.md/.txt, reading time
- Installable PWA + service worker (offline), README (EN) + MIT LICENSE

Fix: switch inputs were covered by decorative spans (pointer-events).

vendor/purify.min.js

@@ -0,0 +1,3 @@
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