Requirement for enhancements

[Abhishek00p]

Hi Devs,

First of all, thank you for the great work on the dart_pptx package — it has been incredibly helpful in solving a key challenge I faced when integrating PowerPoint support into a Flutter project.

I wanted to suggest a small enhancement: currently, when switching the slide layout from a custom size to 16:9, the font size does not scale accordingly. This often results in oversized text that exceeds the layout boundaries.

It would be very useful if the package allowed setting specific font sizes for different elements — such as the title, subtitle, content body, image captions, and bullet points — to ensure consistent formatting across varying slide dimensions.

Also , i would like to contribute more. looking forward to it.

Thanks again for your great work and consideration!.