Implement Circle and other basic shapes

[Kyle-Ye]

Description

While the Shape protocol exists in OpenSwiftUI, basic shape implementations like Circle, Rectangle, RoundedRectangle, Ellipse, and Capsule are missing or incomplete.

API Reference

SwiftUI's built-in shapes: https://developer.apple.com/documentation/swiftui/shapes

Expected API

struct Circle: Shape {
    func path(in rect: CGRect) -> Path
}

struct Rectangle: Shape {
    func path(in rect: CGRect) -> Path
}

struct RoundedRectangle: Shape {
    var cornerRadius: CGFloat
    var style: RoundedCornerStyle
    
    func path(in rect: CGRect) -> Path
}

struct Ellipse: Shape {
    func path(in rect: CGRect) -> Path
}

struct Capsule: Shape {
    var style: RoundedCornerStyle
    
    func path(in rect: CGRect) -> Path
}

Use Case

Basic shapes are fundamental building blocks for UI design. Currently referenced in multiple example files but commented out.

References

• Example usage commented out in: Example/SharedExample/Animation/Timeline/AnimatedColorTimelineView.swift
• Shape protocol exists in: Sources/OpenSwiftUICore/Shape/Shape.swift

Priority

High - Essential for basic UI construction