PR #807 fix (faint amber full ring + brighter top arc) still reads
as 'a border around the icon, with a brighter top' rather than as
a loading spinner — mara reports it's still broken.
This iteration drops the full ring entirely. The ::after now has
transparent borders on three sides plus a bright amber top arc, so
only the rotating arc itself is visible — no static ring frame
around the icon. Same shape every desktop OS uses for circular
progress indicators (Material, Apple's spinner, etc.).
Other tweaks:
- 3px stroke (was 2px) so the arc carries enough visual weight
- inset: -5px + border-radius: 11px to keep the arc hugging the
icon's 6px-radius square at the new stroke width
- 0.9s rotation period (was 1s) — slightly snappier read
Same DOM, same .pending-running class trigger; pure CSS swap.
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