KnowDown: Quiz mit ELO

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🎉 NEW: Full friends system with its own tab. Share your code, send requests, see a joint week / month / all-time ranking with your friends.

✨ NEW: Weekly ranking, today's ELO summary on the home screen, per-question ELO change in your answer history.

🎨 NEW: Food, Entertainment, Mythology and Health categories with their own colors.

♿ Accessibility: VoiceOver now reads period scores aloud and the "report question" button in the history is reachable again.