refactor(settings): move unit-system and global injection-site exclusions to Account

The unit-system selector and the app-wide injection-site exclusions are
personal account preferences, not dashboard-layout controls. Move both
cards from the Dashboard settings section to the Account section, next to
the profile. The persistence path is unchanged — same endpoints, query
keys, mutation hooks, and labels; only the render location moves. The
Dashboard section keeps the layout/widget controls.

src/components/settings/account-section.tsx

@@ -53,6 +53,8 @@ import { restartOnboardingTour } from "@/lib/onboarding/tour-restart";
 import { describePasskeyError } from "@/lib/passkey-errors";
 import { queryKeys } from "@/lib/query-keys";
 import { TimezonePicker } from "@/components/settings/timezone-picker";
+import { UnitPreferenceCard } from "@/components/settings/unit-preference-card";
+import { InjectionSitesCard } from "@/components/settings/injection-sites-card";
 import { detectBrowserTimezone, DEFAULT_TIMEZONE } from "@/lib/tz/format";
 
 interface PasskeyInfo {
@@ -583,6 +585,13 @@ export function AccountSection() {
         </form>
       </div>
 
+      {/* Unit system + global injection-site exclusions live with the
+          account profile: both are personal preferences that apply
+          app-wide, not dashboard-layout controls. */}
+      <UnitPreferenceCard isAuthenticated={isAuthenticated} />
+
+      <InjectionSitesCard isAuthenticated={isAuthenticated} />
+
       {/* Passkeys card */}
       <div className="bg-card border-border rounded-xl border p-6">
         <div className="mb-4 flex items-center gap-2">

src/components/settings/dashboard-section.tsx

@@ -1,14 +1,10 @@
 "use client";
 
 import { DashboardLayoutSection } from "@/components/settings/dashboard-layout-section";
-import { UnitPreferenceCard } from "@/components/settings/unit-preference-card";
-import { InjectionSitesCard } from "@/components/settings/injection-sites-card";
-import { useAuth } from "@/hooks/use-auth";
 import { useTranslations } from "@/lib/i18n/context";
 
 export function DashboardSection() {
   const { t } = useTranslations();
-  const { isAuthenticated } = useAuth();
 
   return (
     <section
@@ -27,10 +23,6 @@ export function DashboardSection() {
         </p>
       </header>
 
-      <UnitPreferenceCard isAuthenticated={isAuthenticated} />
-
-      <InjectionSitesCard isAuthenticated={isAuthenticated} />
-
       <DashboardLayoutSection id="dashboard-layout" />
     </section>
   );