- Add 12-week Weekly Active Users table to global stats with WoW change %
- Fix 7-day and 30-day retention to measure return on exactly day N (not any day within the window)
- Remove "Avg Guesses Today" stat card
- Update retention description to clarify exact-day measurement
- Add bibdle logos (SVG, square PNG, circle PNG) and new favicon.png
- Wire favicon.png as the site favicon via app.html link tag
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
