fix(frontend): errorCode 统一自 generation/cards 去重复定义（CR-H10）

apps/web/lib/style/errorCode-dedup.test.ts

@@ -0,0 +1,19 @@
+import { readFileSync } from "node:fs";
+
+import { describe, expect, it } from "vitest";
+
+// CR-H10 回归守卫：errorCode 只应有一份权威实现（lib/generation/cards），
+// style 侧两个 hook 不得再各自本地定义 `function errorCode(`，须统一 import。
+describe("errorCode 去重（CR-H10）", () => {
+  it.each(["useRefine.ts", "useStyleLearn.ts"])(
+    "%s 不再本地定义 errorCode，且从 generation/cards 引入",
+    (file) => {
+      const src = readFileSync(new URL(`./${file}`, import.meta.url), "utf-8");
+
+      expect(src).not.toMatch(/function\s+errorCode\s*\(/);
+      expect(src).toMatch(
+        /import\s*\{[^}]*\berrorCode\b[^}]*\}\s*from\s*["']@\/lib\/generation\/cards["']/,
+      );
+    },
+  );
+});

apps/web/lib/style/useRefine.ts

@@ -4,6 +4,7 @@ import { useCallback, useState } from "react";
 
 import { api } from "@/lib/api/client";
 import { useToast } from "@/components/Toast";
+import { errorCode } from "@/lib/generation/cards";
 import { buildRefineRequest } from "./style";
 
 export type RefineStatus = "idle" | "refining" | "done" | "error";
@@ -26,12 +27,6 @@ export interface UseRefine {
   reset: () => void;
 }
 
-function errorCode(error: unknown): string | undefined {
-  if (typeof error !== "object" || error === null) return undefined;
-  const env = error as { error?: { code?: unknown } };
-  return typeof env.error?.code === "string" ? env.error.code : undefined;
-}
-
 // 回炉（POST .../refine）：同步返回新旧 diff，不写库（不变量#3）。
 // 503 LLM_UNAVAILABLE（无凭据）优雅提示去设置；其余失败 toast。
 export function useRefine(): UseRefine {

apps/web/lib/style/useStyleLearn.ts

@@ -6,6 +6,7 @@ import { api } from "@/lib/api/client";
 import { useToast } from "@/components/Toast";
 import { useJobPoll } from "@/lib/jobs/useJobPoll";
 import { styleLearnResult } from "@/lib/jobs/job";
+import { errorCode } from "@/lib/generation/cards";
 import {
   buildLearnRequest,
   normalizeFingerprint,
@@ -27,12 +28,6 @@ export interface UseStyleLearn {
   ) => Promise<boolean>;
 }
 
-function errorCode(error: unknown): string | undefined {
-  if (typeof error !== "object" || error === null) return undefined;
-  const env = error as { error?: { code?: unknown } };
-  return typeof env.error?.code === "string" ? env.error.code : undefined;
-}
-
 // 学文风编排：受理（202 job_id）→ useJobPoll 轮询 → done 拉 GET /style 展示指纹。
 export function useStyleLearn(initial: Fingerprint | null): UseStyleLearn {
   const [fingerprint, setFingerprint] = useState<Fingerprint | null>(initial);