Remove unused imports and variables (S1128, S1481, S1854)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/stores/conformance.test.js

@@ -19,7 +19,6 @@ vi.mock("@/api/client.js", () => ({
   default: { get: mockGet, post: mockPost, put: mockPut },
 }));
 
-import apiError from "@/module/apiError.js";
 import { useConformanceStore } from "@/stores/conformance";
 
 describe("conformanceStore", () => {