Improvements for macOS Sequoia

- Revamped notification.
- Revamped countdown screen.
- Menu reorg.
- New keyboard shortcuts.
- Fresh Eyes now translated to German.

- Postpone Fresh Eyes for 1 hour, 2 hours, 3 hours, or until the next day.
- Revamped notification.
- Revamped countdown screen.
- Menu reorg.
- New keyboard shortcuts.
- Fresh Eyes now translated to German.

- Fixes disabling Fresh Eyes from fullscreen counter.
- Enables taking a break now (even when disabled).

- Improves sleep support when using external monitors.

- Automatically reset tired eyes (ie. red icon) on launch.
- Enable taking a break when disabled.
- Enable/disable notification focus.

- Menu bar icon turns turn red if you have skipped your breaks.
- New keyboard shortcuts:
  Cmd-E or F8 toggles enabling when app is active (prevents issues with inadvertently disabling using the previous shortcuts).
- Muting setting now available (no sounds played).
- Fixes warning window text on light mode.
- Fixes snoozing from full screen.
- Improves suspend support.

- Refocus previous app after losing temporary focus.
- Status bar eyes turn red if you skip your breaks.
- Play a sound when break ends.
- Adds about screen.