feat: support bitmap

[runyasak]

Overview

I added bitmap to SVG conversion feature for allowing users to convert simple images into 3D models.
This feature uses Potrace for bitmap tracing and adds a clean, rounded background to the resulting SVG.

Scope of work

• added bitmap to SVG conversion using Potrace
• added support for image file uploads (PNG, JPEG, WebP)
• added rounded background with padding to traced SVGs
• updated UI text and file input accept types

Screenshots

Untitled2.mov

Limitations

• currently works best with simple images (logos, icons, line art)
• complex images or photos may not trace properly due to Potrace's limitations
• recommended to use images with clear contrast and simple shapes

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If you'd like me to update or fix anything, please let me know.
I'm happy to update my code following your feedback.

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[LittleSound]

This is a great feature. So let's merge it.

There are currently a few issues that we hope can be resolved in the future.

• Does not support multiple colors

• The inner edges of hollow shapes are missing, a phenomenon usually referred to as non-manifold edges, which are structures that cannot be 3D printed.

• Cannot remove the added background, the background should be optional.

[runyasak]

@LittleSound Thank you so much.

There are currently a few issues that we hope can be resolved in the future.

I appreciate your feedback. I’ll take more improve this feature to make it works.
Feel free to share any suggestions or ideas you may have — I’d love to hear them.

Thanks again, and I’ll do my best for the next PR. 😁