Translates the React KisaniCircle design to SwiftUI: three concentric
thin rings (outer slate progress, middle static gray, inner green
progress) replace the old single ProgressRing. All ring center text
updated to ultraLight 46pt numbers with 8pt monospaced uppercase labels.
Adds ringCheckmark (22px circle + tiny checkmark) for completed/all-safe
states. Updates checking, disconnected, failed center views to match.
Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>
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