fix(settings): finish the D0-D8 settings/admin frame cleanup

- Drop the leading blurb paragraph from the Channels + Integrations
  connection panels so each body starts at its first card (D0 alignment).
- Correct three stale CORE/always-on comments: medications has been a
  fail-open toggleable module since D3; CORE is now weight/BP/pulse only.
- Remove the dead variant/isSubtab branch from SourcesSection — no callers
  after the D4 split; render the standalone header unconditionally.
- Render the admin AI-quality card frame + header once and branch only the
  body across loading/error/empty/data, matching the coach-feedback card.
- Rename the Coach activation card's section id from the legacy
  settings-ai-* namespace to settings-coach-activate-* after the S5 move.
- Gate the medication low-stock reminder card on the medications module so
  it hides when the account turns medications off, mirroring mood/coach.

src/components/settings/ai/disable-coach-card.tsx

@@ -3,6 +3,10 @@
 /**
  * v1.4.47 W3 — Coach activation toggle card.
  *
+ * v1.18.0 (S5) — moved out of Settings → AI into the dedicated Coach
+ * section; its `<section>` id namespace is `settings-coach-activate-*`
+ * accordingly. (The file path stays under `ai/` as pre-existing drift.)
+ *
  * v1.18.1 (D7) — polarity flip. The card now reads "Activate Coach" with the
  * Switch ON by default (the Coach is on for everyone unless the user opts
  * out). The persisted state is still the single `User.disableCoach` field —
@@ -137,14 +141,14 @@ export function DisableCoachCard({
 
   return (
     <section
-      aria-labelledby="settings-ai-disable-coach-title"
+      aria-labelledby="settings-coach-activate-title"
       data-testid="settings-disable-coach-card"
       className="bg-card border-border rounded-xl border p-4 sm:p-6"
     >
       <SettingsCardHeader
         icon={MessageCircleHeart}
         title={t("settings.coach.activate.title")}
-        titleId="settings-ai-disable-coach-title"
+        titleId="settings-coach-activate-title"
         description={t("settings.coach.activate.description")}
         status={
           <Switch

src/components/settings/integrations/connections-panel.tsx

@@ -242,10 +242,6 @@ export function ConnectionsPanel() {
 
   return (
     <div className="space-y-6" data-slot="connections-panel">
-      <p className="text-muted-foreground text-sm">
-        {t("settings.sections.integrations.connections.description")}
-      </p>
-
       <WithingsCard viewModel={withingsViewModel} />
       <WhoopCard viewModel={whoopViewModel} />
       <FitbitCard viewModel={fitbitViewModel} />

src/components/settings/integrations/notification-channels-panel.tsx

@@ -18,7 +18,6 @@
 import { useQuery } from "@tanstack/react-query";
 
 import { useAuth } from "@/hooks/use-auth";
-import { useTranslations } from "@/lib/i18n/context";
 import { queryKeys } from "@/lib/query-keys";
 import { NotificationStatusCard } from "@/components/settings/notification-status-card";
 import { NtfyCard } from "@/components/settings/ntfy-card";
@@ -37,7 +36,6 @@ interface GlobalServiceAvailability {
 }
 
 export function NotificationChannelsPanel() {
-  const { t } = useTranslations();
   const { isAuthenticated } = useAuth();
 
   const { data: globalServices } = useQuery({
@@ -54,10 +52,6 @@ export function NotificationChannelsPanel() {
 
   return (
     <div className="space-y-6" data-slot="notification-channels-panel">
-      <p className="text-muted-foreground text-sm">
-        {t("settings.sections.integrations.channels.description")}
-      </p>
-
       <NotificationStatusCard />
 
       {/* v1.4.27 MB3 — `scroll-mt-28` keeps each channel card's anchor

src/components/settings/medications-section.tsx

@@ -19,9 +19,11 @@ import { useMedicationListLayout } from "@/lib/queries/use-medication-list-layou
 
 /**
  * v1.16.10 — the "Medikamente" settings section. v1.18.0 (S5) promoted it
- * from a Layout-hub child to its own standalone nav entry (always shown —
- * medications is a CORE domain) and gathered the medication-specific
- * preferences here. Hosts three blocks:
+ * from a Layout-hub child to its own standalone nav entry and gathered the
+ * medication-specific preferences here. v1.18.1 (D3) made medications a
+ * toggleable fail-open module, so this nav entry hides when the account
+ * turns the module off (the medication data routes stay live). Hosts three
+ * blocks:
  *   1. The list VIEW preference — cards vs table, written optimistically
  *      through the same `PUT /api/medications/layout` the page header
  *      toggle uses (the toggle component is shared).

src/components/settings/notifications-section.tsx

@@ -17,9 +17,9 @@ import { MoodReminderCard } from "@/components/settings/mood-reminder-card";
  *
  * Each reminder-type card is shown ONLY when its module is enabled, read from
  * the resolved `useAuth().user.modules` map (the same `/auth/me` map nav and
- * Insights pills gate off). Mood → `mood`, Coach nudge → `coach`. Low-stock
- * runway maps to medications, which fails open (a missing key reads as
- * enabled) so a stale `/me` payload never blanks a card.
+ * Insights pills gate off). Mood → `mood`, Coach nudge → `coach`, low-stock
+ * runway → `medications` (a toggleable fail-open module since D3, so a missing
+ * key reads as enabled and a stale `/me` payload never blanks a card).
  *
  * v1.18.1 (D5) — the page is intentionally lean: the section blurb, the
  * channels / inbox cross-links, and the embedded Vorsorge (preventive-care)
@@ -35,6 +35,7 @@ export function NotificationsSection() {
   // so a stale `/me` payload without the module map keeps every card visible.
   const moodEnabled = user?.modules?.mood !== false;
   const coachEnabled = user?.modules?.coach !== false;
+  const medsEnabled = user?.modules?.medications !== false;
 
   return (
     <section
@@ -61,11 +62,13 @@ export function NotificationsSection() {
         </div>
       ) : null}
 
-      {/* Medication low-stock runway — medications is a CORE domain, so this
-          is always shown. */}
-      <div id="low-stock" className="scroll-mt-28">
-        <LowStockCard isAuthenticated={isAuthenticated} />
-      </div>
+      {/* Medication low-stock runway — only when the medications module is
+          enabled (toggleable, fail-open, since D3). */}
+      {medsEnabled ? (
+        <div id="low-stock" className="scroll-mt-28">
+          <LowStockCard isAuthenticated={isAuthenticated} />
+        </div>
+      ) : null}
 
       {/* Proactive Coach nudge — only when the coach module is enabled. */}
       {coachEnabled ? (

src/components/settings/sources-section.tsx

@@ -111,31 +111,16 @@ const DEVICE_TYPE_LABEL_KEYS: Record<DeviceType, string> = {
   unknown: "settings.sections.sources.deviceLabels.unknown",
 };
 
-export interface SourcesSectionProps {
-  /**
-   * `"standalone"` (the default) renders the full page header + the
-   * cross-link back to Integrations — the shape used while Sources had its
-   * own `/settings/sources` route. `"subtab"` (v1.18.0 S3) suppresses both:
-   * Sources now renders inside the Integrations → Sources sub-tab, so the
-   * page header is the parent section's and a cross-link back to the page
-   * that already contains it would be circular.
-   */
-  variant?: "standalone" | "subtab";
-}
-
 /**
  * `<SourcesSection>` — the per-metric source-priority + device-type ladders.
  *
  * v1.18.1 (D4) — Sources is a standalone `/settings/sources` left-side entry
- * again (split back out of the Integrations sub-tabs). The default
- * `variant="standalone"` renders the section header + the cross-link back to
- * Integrationen; `variant="subtab"` is retained for any embedded use and
- * suppresses the header.
+ * again (split back out of the Integrations sub-tabs). It renders its own
+ * section header + the cross-link back to Integrationen.
  */
-export function SourcesSection({ variant = "standalone" }: SourcesSectionProps = {}) {
+export function SourcesSection() {
   const { t } = useTranslations();
   const queryClient = useQueryClient();
-  const isSubtab = variant === "subtab";
 
   const { data: remote, isLoading } = useQuery({
     queryKey: queryKeys.sourcePriority(),
@@ -298,27 +283,25 @@ export function SourcesSection({ variant = "standalone" }: SourcesSectionProps =
       aria-labelledby="settings-section-sources-title"
       className="space-y-6"
     >
-      {isSubtab ? null : (
-        // v1.18.1 (D0/D4) — standalone left-side entry again. The section
-        // blurb is dropped for consistent top alignment; the cross-link back
-        // to Integrationen (where the sources this ladder ranks are added /
-        // removed) stays as a quiet pointer.
-        <header>
-          <h1 id="settings-section-sources-title" className="sr-only">
-            {t("settings.sections.sources.title")}
-          </h1>
-          <p className="text-muted-foreground text-xs">
-            {t("settings.sections.sources.integrationsHint")}{" "}
-            <Link
-              href="/settings/integrations"
-              className="text-primary underline underline-offset-2"
-              data-slot="sources-integrations-cross-link"
-            >
-              {t("settings.sections.sources.integrationsHintLink")}
-            </Link>
-          </p>
-        </header>
-      )}
+      {/* v1.18.1 (D0/D4) — standalone left-side entry again. The section
+          blurb is dropped for consistent top alignment; the cross-link back
+          to Integrationen (where the sources this ladder ranks are added /
+          removed) stays as a quiet pointer. */}
+      <header>
+        <h1 id="settings-section-sources-title" className="sr-only">
+          {t("settings.sections.sources.title")}
+        </h1>
+        <p className="text-muted-foreground text-xs">
+          {t("settings.sections.sources.integrationsHint")}{" "}
+          <Link
+            href="/settings/integrations"
+            className="text-primary underline underline-offset-2"
+            data-slot="sources-integrations-cross-link"
+          >
+            {t("settings.sections.sources.integrationsHintLink")}
+          </Link>
+        </p>
+      </header>
 
       <div className="bg-card border-border space-y-4 rounded-xl border p-4 sm:p-6">
         <SettingsCardHeader