💄 Add fit to readable content layout guide

[komkovla]

Add SwiftUI Layout Guides

Description

Adds utilities for working with SwiftUI layout margins and readable content guides. This implementation is based on the work from swiftui-layout-guides and provides a clean API for handling layout constraints in SwiftUI.

Key Features:

• WithLayoutMargins view for accessing layout margins and readable content insets
• View modifiers for fitting content to readable width or layout margins width:
  • .fitToReadableContentWidth()
  • .fitToLayoutMarginsWidth()
• Environment values for accessing layout metrics:
  • layoutMarginsInsets
  • readableContentInsets

Usage Example

struct ContentView: View {
  var body: some View {
    Text("Hello World")
    .frame(maxWidth: .infinity)
    .fitToReadableContentWidth() // Constrains text to readable width
  }
}

Platform Support

• iOS
• tvOS
• macOS (partial support)
• watchOS (partial support)

Testing

Includes preview examples demonstrating usage in:

• ScrollView
• List with different styles
• Split view layouts

Attribution

Original implementation inspired by @tgrapperon's swiftui-layout-guides library.

[olejnjak]

@komkovla

[olejnjak]

LGTM!