Redesign landing page — premium storytelling experience

New sections:
- Hero: animated badge, floating game emojis, glow effect
- Stats bar: 10 games / 12 languages / 0 rulebook pages / 30 sec to start
- Problem: emotional storytelling with red X icons
- How it works: 3-step visual flow (Pick → Add players → Play)
- Before/After comparison: Without vs With GameStol
- Mobile section: phone mockup with live game preview
- Games showcase: hover animations, host badges
- Languages: 12 clickable flag cards
- CTA: big button with trust badges (Free, No signup, Mobile)
- Footer: GitHub link

Fixes:
- "How it works" link now uses scrollIntoView (was broken #hash with HashRouter)
- Floating nav has glass blur background
- All text bilingual via L()

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: egorfedorov