Devlog 35: Pomodoro State Transition & Auto-Loop Refactoring

Core Logic & State Fixes

• Auto-Phase Transition Fix: Resolved state lock (status: 'running') preventing automatic transition from Focus to Break. Added explicit status resetting in handlePhaseEnd before invoking startTimer.
• Timer Precision: Replaced Math.round with Math.ceil in countdown logic to eliminate early sound triggers caused by rounding errors.
• Timestamp Recalibration: Implemented dynamic endTime re-calculation when switching modes (work ↔ break) to maintain state consistency.