Major reliability fixes for the 100-day challenge:
• Days now correctly require 6 of 8 items checked to pass and advance.
• If you can't finish a day in time, you have 48 hours to come back
  and complete it before the challenge resets to Day 1.
• Restart Challenge in Settings now works reliably with unlimited
  restarts.
• Fixed a bug where completed days weren't saving and reappeared
  blank on reopen.
• New motivating "Champion" prompts to cheer you on when you're
  close to passing a day.

Fixed critical challenge progression bugs:
• A day now requires 6 out of 8 items to pass — partial progress is
  saved and you have 48 hours to finish before the day resets.
• The Restart Challenge button in Settings now works correctly,
  with unlimited restarts.
• Day progress saves reliably — completed days no longer reappear
  as incomplete on reopen.
• Missing 48 hours of activity now correctly resets to Day 1.
• New motivating "Champion" dialogs to cheer you on when you're
  close to finishing a day.

- Extended grace period: You now have 48 hours to fix missed items before the challenge resets
- Smoother day transitions: After completing or fixing a day, the next day opens automatically
- Improved grace period messaging with clearer countdown instructions

Fixed crash on iOS 26 caused by shadow rendering
Fixed day completion screen not showing locked state clearly
Added self-healing progress sync — progress auto-corrects on every app launch
Fixed progress numbers showing inconsistent values across screens
Improved offline reliability with local-first data storage
Fixed stale data appearing after challenge restart
Admin tools now show accurate user progress numbers

Bug fixes: app now auto-refreshes for the new day without restarting, keyboard dismisses on tap or swipe, fixed premature reset badge on timeline."

Improved stability and performance. Enhanced notification delivery. Better data persistence across app updates.