The mon inspector now has a NICKNAME section: a text field with Set / Clear, commit-on-Enter and discard-on-Escape.
Input is gated at the field instead of refused at commit. Only glyphs the game
font can actually draw AND that round-trip through a .sav are accepted, capped
at the naming screen's 10 glyphs, so a bad keystroke or paste never appears and
Set always succeeds. Chars like "@" (the Gen1 string terminator), "#" and the
dakuten kana have codec entries but no font tile so they are blocked rather than silently mangled.