fix(stock-quick-draft): add trailing newlines

Co-authored-by: Orca <help@stably.ai>

src/lib/server/stock-quick-draft-service.test.ts

@@ -618,4 +618,4 @@ describe("removeQuickDraftLine", () => {
     if (result.ok) return;
     expect(result.reason).toBe("line_not_found");
   });
-});
+});

src/lib/server/stock-quick-draft-service.ts

@@ -465,4 +465,4 @@ export async function removeQuickDraftLine(
       message: err instanceof Error ? err.message : "line delete failed",
     };
   }
-}
+}