Implemented (previously UI-only with no business effect):
- auto_overtime: when OFF, prompt user on clock-out before banking
- overtime_unit: 15/30/60-min truncation choice now actually applied
- notification_before_minutes: 30-min hardcode -> user-configurable 1~120
Removed dead keys (no readers in business logic):
- auto_detect_boot, notification_enabled, annual_leave_used
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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