GeertBosch/chessfun ? reverse-engineered prompt

Build me a small command line tool for chess positions that takes a FEN string and prints a really nice chess board in the terminal.

I want it to be readable and compact, with the pieces aligned properly, a checkered board look, and support for Unicode chess symbols if the terminal can handle them. If colors are available, use them to make the light and dark squares clear and keep the pieces readable. If the terminal is limited, fall back to a simple plain text version that still looks good.

It would be great if it can also turn a FEN position into an SVG or other visual output for examples, and include a couple of sample commands I can run right away. Please make it easy to test from the command line, and if you need to check current terminal behavior or docs online, go ahead.