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/dashboard/dashboard-gates.ts

@@ -55,6 +55,15 @@ const TILE_CAPABLE_WIDGET_IDS = new Set<string>([
   "glucose",
   "bpInTarget",
   "vo2Max",
+  // v1.28.52 — vitals + body-composition strip tiles: each paints one
+  // strip card and self-gates on having a sample of its MeasurementType.
+  "hrv",
+  "oxygenSaturation",
+  "respiratoryRate",
+  "wristTemperature",
+  "muscleMass",
+  "totalBodyWater",
+  "boneMass",
 ]);
 
 /**