The trends grid lost its disk chart; add it back as a 6th card plotting root-filesystem % over time, alongside CPU/Memory/Network/Load/Swap. The 'disk' history series and metric-detail entry already existed, so the expand-to-detail flow works unchanged. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> Signed-off-by: librelad <librelad@digitalangels.vip>