[pipiche38]

What

The Deep Timeline's source row (under the day stepper) was a literal on both platforms — Text("My WHOOP") / R.string.timeline_my_whoop — written for #574 when the strap was the only possible owned source. Repository.timelineSeries reads the active device id first, so with an Oura ring active the chart plotted the ring's series under a WHOOP label (screenshot in #2274).

The row now shows the active device's registry display name via the existing PairedDevice.displayName / displayName(PairedDeviceRow) twins — nickname if set, else "Brand Model" — the same name the Devices screen and the "Make X your active strap" prompts already use. No registry row for the active id (the pre-registry seeded strap) keeps the legacy "My WHOOP".

• Strand/Data/Repository.swift — activeDeviceDisplayName() beside activeStrapIsWhoop5(), same registry read.
• Strand/Screens/FullDayChartView.swift — sourceName state, resolved on repo.deviceId; falls back to the existing literal.
• android/…/ui/FullDayChartScreen.kt — sourceName from the pairedDevices() read the No SpO2 and respiration data captured or shown #623 gate already does; falls back to timeline_my_whoop.

Visible side effect for WHOOP users: a strap with a registry row now reads "WHOOP 4.0" / "WHOOP" / its nickname instead of "My WHOOP" — consistent with the Devices screen, and what a multi-WHOOP setup (#1300, #1304) needs anyway. Say if you'd rather keep "My WHOOP" for the WHOOP brand only; it's a one-line gate.

No new strings ⇒ no locale work; the existing "My WHOOP" translations stay in use for the fallback.

Verification

App-target Swift, so CI doesn't compile it — built locally:

• macOS Strand — xcodebuild … build BUILD SUCCEEDED
• iOS NOOPiOS — xcodebuild … -destination 'generic/platform=iOS Simulator' build BUILD SUCCEEDED
• Android — ./gradlew compileFullDebugKotlin exit 0
• Tools/doc_comment_lint.py — OK, no new detached doc comments
• Tools/i18n_audit.py --ci upstream/main — OK, no new gaps
• Not yet seen on-device (the phone runs integration/oura-full); a screenshot of the corrected row is owed once flashed.

Refs #2274

[pipiche38]

Hardware check on iOS (build integration/oura-full@2fa8e0e0, which carries 679f6fded): with the Oura ring the active device, the Deep Timeline source row now reads the ring's registry name (brand + model, no nickname set) instead of "My WHOOP". The Branch: line of the diagnostics report.txt confirms the build. Nothing else on the screen changed. Refs #2274.