[BUG] Username system broken

[sirbu12]

Description:
Wrong prompt breaks the username.

Steps to Reproduce:

1. Type in a prompt so long that it has to go on the second line ( occupies fully the line where [user@PRos] > is )

Expected Behavior:
return only an error message

Actual Behavior:
returns an error message and instead of the username at the prompt it gives the last prompt in all caps adding ".BIN"
( a reboot fixes it )

Environment:

• x16-PRos version: 1.0 ( from dev branch ( as of june 11 2026 ) )
• Emulator: QEMU emulator version 10.2.50 (v10.2.0-822-gf26976b9d3)