Add Codex run config and sample button styling

Change default color of gcode and updated readme

Lots of updates (x-y origin, formatting, combined TIFFS)

docs: add Hugging Face LFS push guidance

Change black as material and white as empty space

Shorten Hugging Face Space description

Added requirements.txt from uv.lock and Hugging Face Spaces frontmatter to README.md

Simplify STL viewer layout

Add Gradio STL slicer app