fix(integrations): surface the WHOOP dual-source vitals caveat on the connect card

When WHOOP and another source both supply a standard vital (resting heart
rate, blood oxygen, body temperature, respiratory rate, sleep stages), both
values can appear until a future update settles on a single preferred source.
Show this as a calm muted note on the WHOOP card so the known limitation reads
as documented behaviour rather than a bug. New whoopOverlapNote key across all
six locales.

src/components/settings/integrations-section.tsx

@@ -840,6 +840,9 @@ function WhoopCard({
       <p className="text-muted-foreground mt-1 text-xs">
         {t("settings.whoopDescription")}
       </p>
+      <p className="text-muted-foreground/80 mt-2 text-xs">
+        {t("settings.whoopOverlapNote")}
+      </p>
 
       <hr
         data-testid="integration-card-divider"