perf: move area ripple animation to overlay canvas

[DinonowDev]

Summary

• Move the area chart last-price ripple animation from the main canvas update path to the overlay canvas (UpdateLevel.Overlay).
• Avoid redrawing candles, grid, and indicators at animation frame rate when candle.area.point.animation is enabled.
• Fixes [Performance] Optimize high CPU usage when candle.area.point.animation is enabled (Suggest separating ripple animation to overlay layer) #808.

Test plan

• pnpm run debug → switch candle type to Area with point.animation enabled
• Confirm the last-price ripple still breathes visually
• With stream off / static data, confirm CPU/paint cost no longer tracks a full main-layer repaint loop
• Scroll / zoom while Area + animation are on → ripple stays on the last price
• Switch back to Candle → animation stops
• pnpm run code-lint / pnpm run type-check / pnpm run build

[NemeZZiZZ]

Two regressions vs. main:

1. stopAnimation() drops the _animationFrameTime reset

// main
stopAnimation (): void {
  this._animationFrameTime = 0
  this._animation.cancel()
}

// this PR
stopAnimation (): void {
  this._animation.stop()
}

The reset to 0 is gone. Animation.stop() calls _doFrameCallback(this._options.duration) (src/common/Animation.ts:91), so on stop _animationFrameTime is set to animationDuration instead of 0. On the next animation start (e.g. candle → area → candle → area), the first painted ripple uses animationDuration before doFrame updates it, so the ripple briefly renders at the maximum radius instead of starting from radius.

2. The Math.min(progress, 1) clamp was removed

// main
const progress = Math.min(this._animationFrameTime / pointStyles.animationDuration, 1)
rippleRadius = pointStyles.radius + progress * (pointStyles.rippleRadius - pointStyles.radius)

// this PR (drawRipple)
rippleRadius = pointStyles.radius + this._animationFrameTime / pointStyles.animationDuration * (pointStyles.rippleRadius - pointStyles.radius)

Without the clamp, once _animationFrameTime reaches/exceeds animationDuration, the radius grows past pointStyles.rippleRadius. The current code caps progress at 1 to keep the ripple within [radius, rippleRadius].