修复慢网络下审批后页面显示旧状态：SW API 缓存仅在离线时回退 [09-26-approve-success-state-unchanged]

app-api-runtime 对 /api/me、/api/workflow/tasks*、/api/workflow/approvers*、
/api/notifications* 使用 NetworkFirst + networkTimeoutSeconds: 3。网络响应
超过 3 秒时 Service Worker 返回审批前缓存的旧响应，真实响应被丢弃，页面
仍显示「待派发」。审批写入本身正确。自 2026-03（9112383d）起存在。

去掉网络超时，只在网络失败（离线）时回退缓存；退出登录清理缓存不变。
新增回归测试锁定该规则。负载复现修复前 3 轮命中 2 轮，修复后 3 轮 0 命中。

Co-Authored-By: Claude Opus 5.5 <[email protected]>

server/tests/unit/utils/client-pwa-api-cache.test.js

@@ -0,0 +1,24 @@
+import { readFileSync } from "node:fs";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+
+const viteConfig = readFileSync(path.resolve(__dirname, "../../../../client/vite.config.ts"), "utf8");
+
+function runtimeCacheRule(cacheName) {
+  const marker = `cacheName: "${cacheName}"`;
+  const at = viteConfig.indexOf(marker);
+  expect(at, `${cacheName} rule must exist`).toBeGreaterThan(-1);
+  const start = viteConfig.lastIndexOf("urlPattern:", at);
+  const end = viteConfig.indexOf("urlPattern:", at);
+  return viteConfig.slice(start, end === -1 ? undefined : end);
+}
+
+describe("client PWA API runtime cache", () => {
+  it("falls back to cached API data only when the network fails, never on a slow response", () => {
+    const rule = runtimeCacheRule("app-api-runtime");
+    expect(rule).toContain('handler: "NetworkFirst"');
+    // A timeout made the service worker answer a post-approval refetch with the
+    // cached pre-approval task after 3s, so the page kept showing "待派发".
+    expect(rule).not.toMatch(/networkTimeoutSeconds/);
+  });
+});