Add VisionOS Support to LaTeXSwiftUI

[matiasvillaverde]

Summary

This PR enables compilation and support for Apple's VisionOS platform in the LaTeXSwiftUI package.

Changes Made

Package Configuration Updates

• Swift Tools Version: Bumped from 5.7 to 5.8 to support VisionOS platform requirements
• Platform Support: Added .visionOS(.v1) to the supported platforms list alongside existing iOS and macOS support
• Dependencies: Updated SwiftDraw dependency from version 0.20.1 to 0.22.0 for VisionOS compatibility

Code Compatibility

• Font Type Aliasing: Extended the platform-specific font type aliasing in LaTeX_Previews+Fonts.swift to include VisionOS alongside other iOS-family platforms
  • Modified the conditional compilation directive to include os(visionOS) in the UIKit import section

Impact

• No Breaking Changes: All existing functionality remains intact
• New Platform: Developers can now use LaTeXSwiftUI in VisionOS applications
• Minimal Changes: Only 7 additions and 6 deletions, keeping the changeset focused and reviewable

Testing Recommendations

• Verify compilation on VisionOS simulator/device
• Ensure existing iOS and macOS functionality remains unaffected
• Test LaTeX rendering on VisionOS to confirm proper display

This is a straightforward platform expansion that maintains backward compatibility while opening up the package to Apple's spatial computing platform.