Bind Timer State to CircularTimerPanel

[AkshayAshokCode]

Connect the CircularTimerPanel to the PomodoroTimerService to update progress and session state in real time.

• Tasks:
  Observe timeLeft and state from PomodoroTimerService
  Parse timeLeft into percentage of time remaining
  Repaint the CircularTimerPanel on every tick
  Handle transitions between FOCUS and BREAK visually