Deduplicate Dexcom Share readings to fix delta always zero#661
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Dexcom Share returns each reading twice when both the iPhone Dexcom app and the Apple Watch app upload to the same account (~9-10 s apart, same SGV). Without deduplication the two most recent entries in bgData were always identical, producing delta = 0. The NS fetch path already had inline deduplication. Extract it into a shared helper (deduplicateBGReadings) and apply it to the Dexcom-only path as well.
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Summary
bgDatawere always identical, sodelta = latestBG - priorBG = 0every time.deduplicateBGReadings(_:)and applied it to the Dexcom-only path as well.