feat(dashboard): tiles for HRV, blood oxygen, breathing rate, temperature, and body composition

Several readings were synced and charted but had no place on the dashboard
strip: heart-rate variability, blood oxygen, breathing rate, wrist temperature,
and — for body-composition scale users — muscle mass, body water, and bone mass.
Each now has a tile.

The tiles are pure client additions: the dashboard snapshot already ships a
summary for every measurement type, so no backend, query, or migration changed.
Each tile is data-availability gated (renders only when the account has that
reading) and is toggleable and reorderable under Settings like the rest.

hrv and respiratoryRate graduate from iOS-only to web-writable widget ids, and
muscleMass is a new writable id (catalogue 36 to 37, within the 40-id PUT cap);
wristTemperature moves from pin-only to a web-rendered tile. All additive — the
widget enum only widens, which the iOS contract treats as non-breaking.

src/components/settings/__tests__/dashboard-layout-section.test.tsx

@@ -383,7 +383,8 @@ describe("<DashboardLayoutSection> — iOS-pin-only ids hidden from web (v1.11.2
       stairAscentSpeed: "Stair ascent speed",
       stairDescentSpeed: "Stair descent speed",
       breathingDisturbances: "Breathing disturbances",
-      wristTemperature: "Wrist temperature",
+      // v1.28.52 — `wristTemperature` is no longer pin-only; it now renders
+      // a web row, so it left both IOS_PIN_ONLY_WIDGET_IDS and this map.
       falls: "Falls",
       walkingSteadiness: "Walking steadiness",
     };

src/components/settings/dashboard-layout-section.tsx

@@ -138,8 +138,13 @@ const WIDGET_LABEL_KEYS: Record<DashboardWidgetId, string> = {
   glucose: "measurements.typeBloodGlucose",
   totalBodyWater: "measurements.typeTotalBodyWater",
   boneMass: "measurements.typeBoneMass",
+  // v1.28.52 — muscle mass joins the body-composition strip tiles.
+  muscleMass: "measurements.typeMuscleMass",
   bpInTarget: "dashboard.bpInTarget",
   oxygenSaturation: "measurements.typeOxygenSaturation",
+  // v1.28.52 — HRV + respiratory rate graduate to web-writable widgets.
+  hrv: "measurements.typeHeartRateVariability",
+  respiratoryRate: "measurements.typeRespiratoryRate",
   achievements: "achievements.title",
   // v1.4.25 W8d — VO2 max secondary-metric tile (opt-in).
   vo2Max: "dashboard.vo2Max",