fix(audit): UI — L18 (decorative emoji -> Lucide icons), L19 (gated NotesList timer + create-from-url ref-in-effect)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/api/v1/admin/ocr-settings/route.ts

@@ -61,7 +61,7 @@ export const PUT = withAuth(
         },
         ctx.userId,
       );
-      return NextResponse.json({ ok: true });
+      return new NextResponse(null, { status: 204 });
     } catch (error) {
       return errorResponse(error);
     }