Finish the wiring polish: verbosity gate, upload flash, /about links, dead settings slugs

- The Coach verbosity picker is disabled while the concise tone forces
  brief, with a hint saying so, instead of a live control that silently
  does nothing.
- A fresh document upload flashes its new row like the duplicate path
  always did; the settle decision is a pure exported helper with a test.
- /about gains its two inbound links: the /privacy footer and a
  Settings→About credits row (the GeoLite2 EULA wants the attribution
  reachable from the running app).
- The eight settings slugs shadowed by permanent redirects (the seven
  layout children + sharing) leave the slug registry: no more
  prerendering unreachable pages, no dead component wirings, and the
  SectionPlaceholder fallback that could never render is gone. The
  redirects, section components, and layout-hub subpages are unchanged.

src/app/privacy/page.tsx

@@ -2057,6 +2057,18 @@ export default function PrivacyPage() {
             </a>
             . Policy version {POLICY_VERSION}. Last updated {LAST_UPDATED}.
           </p>
+          {/* The GeoLite2 EULA wants the attribution page reachable from the
+              running app — this and the Settings→About row are the two
+              inbound links to /about. */}
+          <p className="mt-2">
+            <Link
+              href="/about"
+              className="hover:text-foreground hover:underline"
+              data-slot="privacy-about-link"
+            >
+              About HealthLog — credits &amp; data attributions
+            </Link>
+          </p>
         </footer>
       </main>
     </div>

src/app/settings/[section]/page.tsx

@@ -10,27 +10,16 @@ import { AdvancedSection } from "@/components/settings/advanced-section";
 import { AiSection } from "@/components/settings/ai-section";
 import { ApiSection } from "@/components/settings/api-section";
 import { CoachSection } from "@/components/settings/coach-section";
-import { DashboardSection } from "@/components/settings/dashboard-section";
 import { EnvironmentSection } from "@/components/settings/environment-section";
 import { ExportSection } from "@/components/settings/export-section";
 import { GesundheitsakteSection } from "@/components/settings/gesundheitsakte-section";
-import { IllnessSection } from "@/components/settings/illness-section";
-import { InsightsSection } from "@/components/settings/insights-section";
 import { IntegrationsSection } from "@/components/settings/integrations-section";
-import { LabsSection } from "@/components/settings/labs-section";
 import { LayoutSection } from "@/components/settings/layout-section";
-import { MedicationsSection } from "@/components/settings/medications-section";
 import { McpSection } from "@/components/settings/mcp-section";
 import { ModulesSection } from "@/components/settings/modules-section";
-import { MoodSection } from "@/components/settings/mood-section";
 import { NotificationsSection } from "@/components/settings/notifications-section";
 import { PrivacySection } from "@/components/settings/privacy-section";
 import { ScoreSection } from "@/components/settings/score-section";
-import { SectionPlaceholder } from "@/components/settings/section-placeholder";
-import { VorsorgeSection } from "@/components/settings/vorsorge-section";
-// v1.18.1 (D4) — `sources` is a standalone left-side entry (split out of the
-// Integrations sub-tabs). v1.25.3 — `channels` folded into Notifications.
-import { SharingSection } from "@/components/settings/sharing-section";
 import { SourcesSection } from "@/components/settings/sources-section";
 import { ThresholdsSection } from "@/components/settings/thresholds-section";
 import {
@@ -72,21 +61,13 @@ const SECTION_COMPONENTS: Record<
   sources: SourcesSection,
   notifications: NotificationsSection,
   layout: LayoutSection,
-  dashboard: DashboardSection,
-  insights: InsightsSection,
-  medications: MedicationsSection,
-  mood: MoodSection,
-  labs: LabsSection,
-  illness: IllnessSection,
   environment: EnvironmentSection,
   anamnesis: AnamnesisSection,
   score: ScoreSection,
-  vorsorge: VorsorgeSection,
   thresholds: ThresholdsSection,
   api: ApiSection,
   mcp: McpSection,
   gesundheitsakte: GesundheitsakteSection,
-  sharing: SharingSection,
   export: ExportSection,
   advanced: AdvancedSection,
   privacy: PrivacySection,
@@ -107,32 +88,25 @@ export default async function SettingsSectionPage({ params }: PageProps) {
     notFound();
   }
 
+  // `SECTION_COMPONENTS` is an exhaustive Record over the slug union, so a
+  // slug without a wired component is a compile error — the old runtime
+  // `<SectionPlaceholder>` fallback could never render and was removed.
   const SectionComponent = SECTION_COMPONENTS[section];
-  // Defensive fallback: in theory unreachable since `isSettingsSectionSlug`
-  // guards the slug, but a future slug added to `SETTINGS_SECTION_SLUGS`
-  // without a wired component would otherwise crash silently — placeholder
-  // surfaces the gap visually instead.
   // v1.18.6.1 — the heading + subtitle (and the Layout-hub "← back" link)
-  // now live in `<SettingsShell>`, which places them in their own grid row
+  // live in `<SettingsShell>`, which places them in their own grid row
   // spanning only the content column so the left nav's first item lines up
   // with the top of the first card. The page body is pure card content,
   // wrapped in the labelled `<section>` so the historic
   // `settings-section-<slug>-title` `aria-labelledby` linkage still resolves.
-  const body = SectionComponent ? (
-    <section
-      aria-labelledby={`settings-section-${section}-title`}
-      className="space-y-6"
-    >
-      <SectionComponent />
-    </section>
-  ) : (
-    <SectionPlaceholder slug={section} />
-  );
-
   return (
     <SettingsShell active={section}>
       <RecordSettingsSectionGate section={section}>
-        {body}
+        <section
+          aria-labelledby={`settings-section-${section}-title`}
+          className="space-y-6"
+        >
+          <SectionComponent />
+        </section>
       </RecordSettingsSectionGate>
     </SettingsShell>
   );

src/app/settings/page.tsx

@@ -5,10 +5,8 @@ import { permanentRedirect } from "next/navigation";
  *
  * Pre-v1.4 the entire settings UI lived in this single 3000+ LOC file. As part
  * of the v1.4 settings split (PR series A2), each concern moved to its own
- * route under `/settings/[section]/page.tsx`. The historic monolith is
- * preserved verbatim in `page.legacy.tsx` for section-by-section extraction in
- * the follow-up PRs (A2-account, A2-about, A2-ai, A2-integrations,
- * A2-notifications, A2-rest).
+ * route under `/settings/[section]/page.tsx`; the extraction finished long
+ * ago and the historic monolith is gone.
  *
  * 308 (`permanentRedirect`) keeps the request method intact and is the right
  * answer for a permanent address change — bookmarks, deep-links, and any