Add 20-20-20 reminders to reduce eyestrain.

[VincentBurke]

Description

Added a feature that is useful to users trying to follow the 20-20-20 eyesight rule. I'm new to Swift, but have thoroughly tested and tried my best to follow style guidelines. Open to feedback:)

What changed

• Added a new eye-break reminder manager to handle reminder lifecycle and timing:
  • tracks active time toward reminder interval
  • defers accrual while the system is sleeping, display is sleeping, or session is inactive
  • supports snooze and skip behavior
  • runs a 1-second timer only during the visible break countdown
  • properly cancels/restarts timers to avoid duplicate loops
• Added notch reminder presentation and interaction:
  • gentle banner with visible countdown
  • actions for Skip and Snooze
  • auto-dismiss + cycle reset after countdown completes
  • smoother open/close behavior aligned with existing notch interactions
• Added Wellness settings:
  • enable/disable reminders
  • interval minutes, break seconds, snooze minutes
  • sound toggle
  • optional “pause media when reminder appears”
• Added media integration:
  • optional pause on reminder show
  • resume after reminder ends
• Added DEBUG-only controls for testing:
  • manual trigger
  • reset state
  • compact active-time/status display

Why

The goal is to provide a lightweight reminder flow that helps reduce eye strain without Notification Center noise, while matching existing app behavior and performance expectations.

Related Issues

None

Screenshots / Recordings