## Feature 002: Break timer with user configuration

**Sources:** break-timer-with-user-configuration, persistent-settings-across-app-launches
**Personas:** knowledge worker managing fatigue across the day
**Stack span:** full-stack
**Tier:** v1

**Description:**

User configures break duration, starts a break timer, sees the timer run with visual distinction from focus, receives notification when break ends.

**Constituent tickets:**
- break-timer-with-user-configuration
- visual-distinction-between-focus-and-break
- persistent-settings-across-app-launches
