feature: do not disturb

skip idle reset check when there is no break

fix: break popup hanging

Refactor and remove features not in high value

Remove featues to reduce code complexity:
* Working hour - we should not stay on computer too long no matter for work or not
* Idle reset notification

Other changes:
* Add logs for debugging
* Use UNIX epoch to avoid issue during TZ/DST switching
* Unify the idle reset duration calculation for computer in idle, lock and sleep states.