Add basic non-ASCII text support for printing

[Gnado]

Summary

This MR adds basic non-ASCII text support for printing by replacing unicode_escape decoding with a safer escape parser for CLI input.

Changes

• add decode_cli_escapes() to handle common escaped whitespace sequences
• preserve non-ASCII characters while still supporting \n, \t, \r, and \\

Example input

Hello world
Привет мир
Γειά σου κόσμε
Ciao mondo
Olá mundo
Sveika pasaule
C:\\Users\\Gnado\\Documents
 \n \t \\ \" \'

[AaronChartier]

Thanks for the contribution! The decode_cli_escapes approach is a solid fix for the non-ASCII corruption issue. Just one small bug to fix in print_file — see inline comment. Once that's updated, this is good to merge! 🎉

[Gnado]

Fixed in 63903a3. Please take another look.

[AaronChartier]

Looks great — the fix in 63903a3 is correct. Tested locally with accented Latin characters (café, résumé, Olá) and newline escapes on a real printer. Everything works perfectly. Thanks for the contribution! 🎉