Replace the disk gauge's concentric inner ring with a single ring whose
leading portion is coloured to mark the LibrePortal share of the disk
(one ring: total disk used overall, LibrePortal highlighted within it).
On the full-screen Disk metric page, add a flat reference line marking
LibrePortal's current share alongside the disk-usage trend. The gauge
gains a `segment` option; the chart line is a "now" value (no historical
LP series yet), so it's flat across the range.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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