The signature screen showed only the text a personal message decodes
to, with bidirectional, right-to-left and zero-width characters acting
on it, so a site could make the message read differently from the
bytes that are signed, and a message that was not hex was decoded into
NUL characters. The screen now shows the hex as "Raw data" alongside
the text, lays the text out left to right in byte order, and shows
each control character and each character that paints nothing (the set
src/shared/symbolSpoof.js already strips) as a U+XXXX mark. A message
is hex when getBytes, which signing uses, reads it; one that is not
cannot be signed, so it is shown as plain text with "Sign" disabled.
Model: opus-5-5
