Add saturation adjustment property to VisualEffectView

[Copilot]

This PR adds saturation control to VisualEffectView, enabling Figma-style blur effects with color saturation adjustment.

New Features

UIKit API

let visualEffectView = VisualEffectView()
visualEffectView.blurRadius = 10
visualEffectView.saturation = 1.5  // 50% more saturated colors

SwiftUI API

VisualEffect(
    colorTint: .blue,
    colorTintAlpha: 0.3,
    blurRadius: 12,
    saturation: 1.8  // Vibrant colors
)

Implementation Details

• Property: Added saturation: CGFloat property with default value 1.0
• Underlying Implementation: Uses the existing saturationDeltaFactor key from the private blur effect API
• Value Range:
  • 0.0 = completely grayscale
  • 1.0 = original saturation (default)
  • > 1.0 = increased saturation (more vibrant)
• Pattern: Follows the same implementation pattern as existing properties like scale and blurRadius

Example App Updates

The example app now includes dual sliders to demonstrate both blur and saturation effects:

• Blur radius control (0-20)
• Saturation control (0-3)
• Real-time preview showing the combined effects

Usage Examples

// Subtle enhancement
visualEffectView.saturation = 1.2

// Muted background effect
visualEffectView.saturation = 0.6

// Artistic grayscale blur
visualEffectView.saturation = 0.0
visualEffectView.blurRadius = 15

The implementation maintains full backward compatibility and follows the established API patterns.

Fixes #55.

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