Create CircularTimerPanel UI Component

[AkshayAshokCode]

Create a custom JPanel component named CircularTimerPanel to render a circular progress ring with session/break timer at the center.

• Tasks:

• Create class CircularTimerPanel in com.github.akshayashokcode.devfocus.ui.timer

• Override paintComponent(Graphics g)

• Draw:
  Background circle
  Progress arc (using Arc2D.Float)
  Centered time (MM:SS)
  Session label (“FOCUS” / “SHORT BREAK”)
  Use anti-aliasing and smooth color transitions