Rings were capped at a fixed 86dp; now each gauge fills its half of the widget
(weighted ImageView) so they grow with the placed widget size. Bumped RingRenderer
default bitmap to 360px/36 stroke to stay crisp at the larger display size.
Add RingRenderer (circular gauge mirror of BarRenderer), a widget_layout_rings
layout, a Bars/Rings preference + in-app toggle, and ring rendering branch in
ClaudeUsageWidget. Full (4x2) widget honors the chosen style; compact size stays
bars. Phase 1 of porting hamed-elfayome/Claude-Usage-Tracker features.