Improve cross platform handling

[oleksiikolomiietssnapp]

✨ This PR Will:

• use SnappThemingImage
• add more tests
• remove scaling of the image. this part:

let targetSize = CGSize(
    width: max(validSVGImage.size.width, 512),
    height: max(validSVGImage.size.height, 512)
)
validSVGImage.scaleToFit(inside: targetSize)

The reason for removing it is that scaling the rendered image increases memory usage and appears unnecessary. Even if an .svg file is placed in the Assets folder, it will not resize automatically when used if the source image is small.

🎯 Purpose

to decrease usage of canImport and meta less boilerplate code

🧪 Unit Tests

• added tests for converter and processor
• provided fakes and mocks

📸 Screenshots

[github-actions]

🛡️ Code Coverage Report

ID	Name	Executable Lines	Coverage
0	SnappThemingSVGSupport	39	100%

Generated by GitHub Actions.

[stinger]

Take a bow :)
🙇