Widget: republish on live heart-rate changes too (#114)

[digitalerdude]

Summary

• Addresses Data inaccuracy on the iOS widget ryanbr/noop#114.
• A same-day maintainer commit (134197f) fixed the Home/Lock-Screen widget's battery % and connection state going stale during a foreground session, since those are LIVE state (model.live) that never bumps the repo-cache refreshSeq the widget's other fields ride. That commit explicitly scoped out other polish from Data inaccuracy on the iOS widget ryanbr/noop#114 but left one gap of the same kind: WidgetSnapshot.bpm reads model.bpm (the smoothed live heart rate), which had no matching republish hook.
• Adds a model.$bpm-driven republish hook, foreground-gated exactly like the existing battery/connected ones. model.bpm already change-guards itself in ingestHR() (only assigns when the smoothed median actually moves), so this can't out-pace the existing hooks' throttling story.
• Does not touch the "Charge reads like battery" label question or richer widget illustrations also mentioned in Data inaccuracy on the iOS widget ryanbr/noop#114 — the maintainer's own commit called those out as separate design calls, so left them out of scope here too.

Test plan

• iOS (NOOPiOS) target builds clean via xcodebuild.
• Change mirrors the exact pattern of the existing, already-merged battery/connected hooks in the same file — no new test seam needed, consistent with that precedent (which also shipped without new tests, per its own commit message).
• Could not get a live on-device check of the widget refreshing during an active HR stream in this environment — worth a manual check before merge.

🤖 Generated with Claude Code

[digitalerdude]

Closing this fork-internal PR to declutter — the real submission lives at ryanbr/noop (upstream). See that repo's PR list for the current, actionable version of this work.