## Summary
* Previous `fontconvert_sdcard.py` requires that the intervals are named
(i.e. listed in `INTERVAL_PRESETS`, ex. "latin1"), this change will also
allow them to be unnamed (ex. "(0x2100-0x214F)") for a more flexible
usage.
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### AI Usage
While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? _**NO**_
Stefan Blixten Karlsson
d3e0aeb62b