feat(insights): surface the Oura body-temperature deviation on skin temperature

Oura's overnight body-temperature deviation — a signed delta from the personal
baseline that tracks illness and cycle onset — was stored but never shown. Add
it as a data-gated tile beneath the chart on the metabolic skin-temperature
page, its most coherent home. It mounts only when the Oura series has readings,
so a non-Oura account renders the page unchanged.

src/app/insights/skin-temperature/page.tsx

@@ -1,8 +1,10 @@
 "use client";
 
-import { Thermometer } from "lucide-react";
+import { Thermometer, ThermometerSnowflake } from "lucide-react";
 
+import { useTranslations } from "@/lib/i18n/context";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
+import { ConnectedDeviceScoreTile } from "@/components/insights/device-score-tile";
 
 /**
  * v1.7.0 — `/insights/skin-temperature`.
@@ -11,8 +13,14 @@ import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page
  * the chart daily-aggregates through the rollup read path. Empty-state
  * carries no manual-entry CTA — the series arrives from Apple Health or
  * Withings sync.
+ *
+ * v1.17.1 — the Oura overnight body-temperature DEVIATION (a signed delta from
+ * the personal baseline, an illness / cycle signal) joins this metabolic page
+ * as a gated tile beneath the chart. It only mounts when the Oura series has
+ * data, so a non-Oura account renders the page byte-identically.
  */
 export default function InsightsHauttemperaturPage() {
+  const { t } = useTranslations();
   return (
     <HealthKitMetricPage
       measurementType="SKIN_TEMPERATURE"
@@ -27,6 +35,19 @@ export default function InsightsHauttemperaturPage() {
       emptyStateIcon={<Thermometer className="size-6" />}
       emptyStateCtaType={null}
       coachPrefill="I haven't logged any skin temperature yet — what does this metric tell me about my health, and how do I improve it?"
+      afterChart={
+        <ConnectedDeviceScoreTile
+          type="BODY_TEMPERATURE_DEVIATION"
+          title={t("measurements.typeBodyTemperatureDeviation")}
+          icon={ThermometerSnowflake}
+          color="#8be9fd"
+          unit="°C"
+          fractionDigits={2}
+          sectionTitle={t("insights.bodyTempDeviation.title")}
+          sectionIcon={ThermometerSnowflake}
+          sectionSubtitle={t("insights.bodyTempDeviation.subtitle")}
+        />
+      }
     />
   );
 }