Fix printf escape sequence interpretation in showhardware.sh

[Copilot]

printf without a format specifier does not interpret \n backslash escapes, so the $HEADER and $FOOTER variables were printing literal \n strings instead of newlines.

Changes

• showhardware.sh: Replaced all bare printf "$HEADER ... $FOOTER" calls with printf "%b" "$HEADER ... $FOOTER" — the %b format specifier is the POSIX-portable way to enable backslash escape interpretation in printf

# Before
printf "$HEADER System Information $FOOTER"

# After
printf "%b" "$HEADER System Information $FOOTER"

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.