Fix uptime to include hours/minutes, add a purple/gold theme

hw.sh's uptime was parsed from `uptime`'s text output, which cut off
at the first comma - dropping the H:MM part entirely. It also never
actually rolled over to months/years for long uptimes (FreeBSD's
uptime just keeps growing the day count). Replaced with a direct
`sysctl kern.boottime` computation for a fully deterministic "Nd Hh
Mm" format. Caught a real bug along the way: the first attempt at the
sed extraction grabbed `usec` instead of `sec`, since "usec" contains
"sec" as a substring and the pattern wasn't anchored tightly enough.

render.sh's palette now uses purple/lavender for headings and borders
and a gold accent (title underline, value-column text), taking cues
from reference character art. The green/yellow/red/gray status
squares are untouched - they carry semantic meaning the color scheme
shouldn't interfere with.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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