Fix auto warmth restoration after display wake

[olujicz]

Summary

• observe both Mac wake and screen-only wake events through NSWorkspace.shared.notificationCenter
• coalesce duplicate wake notifications before restoring display output
• recalculate automatic warmth from the current time after display stabilization
• cancel pending wake updates when automatic warmth is disabled
• add regression coverage for system wake, screen wake, duplicate events, and cancellation

Root cause

The wake handlers registered NSWorkspace notifications on NotificationCenter.default, which does not deliver workspace wake notifications. They also observed only full system wake, so a display powered down with pmset displaysleepnow could wake without triggering gamma restoration or an immediate automatic-warmth recalculation.

User impact

Brightness, gamma, and time-based warmth are restored after both full Mac wake and display-only wake. Automatic warmth is recalculated after the display has stabilized, avoiding stale day/night temperature after the screen has been off.

Validation

• full Dimmerly test suite
• Dimmerly App Store scheme build
• SwiftFormat
• SwiftLint in strict mode (0 violations)
• Gitleaks pre-commit hook