fix(settings): report the outcome of quiet settings actions

Adding or removing a passkey or a security key only redrew the list.
Disconnecting an integration and revoking a share link ran from a dialog
that had already closed, so a refused request left everything as it was
without a word. The injection-site exclusions, the local OCR switch and
the preventive-care reminder switches saved, or did not, in silence.

Each now reports through the outcome toast and, where the card has no
inline error line, the shared error toast with its error id.

src/components/labs/labs-settings.tsx

@@ -14,6 +14,7 @@
  * View / sort / order persist client-side via `useModuleListPrefs("labs")`.
  */
 import { useQuery } from "@tanstack/react-query";
+import { toastWrittenOutcome } from "@/components/outcome/outcome-toast";
 import {
   ArrowDownUp,
   FlaskConical,
@@ -29,6 +30,7 @@ import { Label } from "@/components/ui/label";
 import { Skeleton } from "@/components/ui/skeleton";
 import { Switch } from "@/components/ui/switch";
 import { apiGet } from "@/lib/api/api-fetch";
+import { showErrorToast } from "@/lib/errors/error-toast";
 import { useTranslations } from "@/lib/i18n/context";
 import { queryKeys } from "@/lib/query-keys";
 import { ModuleViewToggle } from "@/components/module-list/module-view-toggle";
@@ -139,7 +141,16 @@ export function LabsSettings() {
             <Switch
               checked={localOcr.data?.labsLocalOcrEnabled ?? false}
               disabled={localOcr.isLoading || updateLocalOcr.isPending}
-              onCheckedChange={(checked) => updateLocalOcr.mutate(checked)}
+              onCheckedChange={(checked) =>
+                updateLocalOcr.mutate(checked, {
+                  onSuccess: () =>
+                    toastWrittenOutcome("success", t("settings.saved")),
+                  onError: (failure) =>
+                    showErrorToast(t("settings.savingError"), {
+                      cause: failure,
+                    }),
+                })
+              }
               aria-label={t("labs.localOcr.heading")}
             />
           }