Merge ToastKit features: add attribute-based configuration and enhanced UI capabilities

[Copilot]

Integrates ToastKit's attribute-based API and UI enhancements into ToastSwift while preserving the existing queue-based management system.

Added Components

• ToastAttributes - Structured configuration with 18 parameters (insets, colors, fonts, spacing, position, duration)
• ToastPosition - Enum for .top, .center, .bottom positioning
• ToastKitView - Enhanced view supporting title+message dual labels and optional interactive button
• UIView+Toast - Extension for simplified toast display
• UIColor+Extension - Hex color parsing with validation (#FF5733 → UIColor)

Usage

New simplified API alongside existing queue-based API:

// New: Attribute-based (ToastKit-inspired)
let attributes = ToastAttributes(
    backgroundColor: .colorWithHexString("#3C3C3E"),
    title: "Success",
    message: "Operation completed",
    showButton: true,
    buttonText: "Undo",
    position: .top
)
view.showToastMessage(with: attributes) {
    // Handle button tap
}

// Existing: Queue-based (ToastSwift original) - still works
let toast = ToastSwift(text: "Hello")
toast.show()

Technical Notes

• Both APIs functional and can be used together
• ToastKitView made public with proper encapsulation (private(set) for internal state)
• Button target fixed (was nil, now self)
• Hex color validation with black fallback for invalid inputs
• Memory management: consistent weak self capture in animation chains
• iOS 12.0+ for original API, iOS 15.0+ for new features (matches package requirements)

Documentation

• EXAMPLES.md - 12 usage patterns
• FEATURE_COMPARISON.md - Feature matrix and migration guide
• MERGE_SUMMARY.md - Implementation details

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