release: FL 2.0 前端候选（流程线停发/发起页指派预览/测试夹具）

配套 service 候选 500a9a2：
- flow.ts 增加 admin/def/offlineLine、enableLine（T03 线级停发/恢复）
- Defs.vue 接线级停发开关与状态展示；lineOffline.ts 收敛判定与文案
- AssignPreview.vue + assignEmbed.ts 发起时指派预览（T02 契约）
- def-editor 表单坐标绑定微调
- 新增 vitest 组件测试与 line-offline 契约测试（npm test 可跑）

tests/line-offline.test.ts

@@ -0,0 +1,147 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { lineActionErrorDetail, runLineAction } from "../src/utils/lineOffline";
+
+/** 线级启停纯逻辑单测：不发真实请求，边界=请求/刷新编排，不代表后端或真实 UI 已验证 */
+
+test("停发成功：按 flowGuid 调一次接口，按返回行数刷新", async () => {
+    const calls: string[] = [];
+    let reloads = 0;
+    const out = await runLineAction({
+        flowGuid: " g1 ",
+        lineOffline: 0,
+        action: "offline",
+        request: async (guid) => { calls.push(guid); return 3; },
+        reload: async () => { reloads++; },
+    });
+    assert.deepEqual(calls, ["g1"]);
+    assert.equal(out.kind, "updated");
+    assert.equal(out.affected, 3);
+    assert.equal(out.reloadFailed, false);
+    assert.equal(reloads, 1);
+});
+
+test("恢复成功：已停发线才发恢复请求", async () => {
+    let requested = "";
+    let reloads = 0;
+    const out = await runLineAction({
+        flowGuid: "g2",
+        lineOffline: 1,
+        action: "enable",
+        request: async (guid) => { requested = guid; return 2; },
+        reload: async () => { reloads++; },
+    });
+    assert.equal(requested, "g2");
+    assert.equal(out.kind, "updated");
+    assert.equal(out.affected, 2);
+    assert.equal(reloads, 1);
+});
+
+test("重复停发被前端状态守卫拦下：不发请求、不刷新", async () => {
+    let requests = 0;
+    let reloads = 0;
+    const out = await runLineAction({
+        flowGuid: "g3",
+        lineOffline: 1,
+        action: "offline",
+        request: async () => { requests++; return 1; },
+        reload: async () => { reloads++; },
+    });
+    assert.equal(out.kind, "skipped");
+    assert.equal(out.reason, "already-offline");
+    assert.equal(requests, 0);
+    assert.equal(reloads, 0);
+});
+
+test("恢复一条未停发的线被拦下：不发请求、不刷新", async () => {
+    let requests = 0;
+    const out = await runLineAction({
+        flowGuid: "g4",
+        lineOffline: 0,
+        action: "enable",
+        request: async () => { requests++; return 1; },
+        reload: async () => {},
+    });
+    assert.equal(out.kind, "skipped");
+    assert.equal(out.reason, "not-offline");
+    assert.equal(requests, 0);
+});
+
+test("空 flowGuid 不发请求（历史脏行防误操作整线）", async () => {
+    let requests = 0;
+    const out = await runLineAction({
+        flowGuid: "",
+        lineOffline: 0,
+        action: "offline",
+        request: async () => { requests++; return 1; },
+        reload: async () => {},
+    });
+    assert.equal(out.kind, "skipped");
+    assert.equal(out.reason, "no-guid");
+    assert.equal(requests, 0);
+});
+
+test("接口返回 0 行：报 empty 但仍刷新列表以同步真实状态", async () => {
+    let reloads = 0;
+    const out = await runLineAction({
+        flowGuid: "g5",
+        lineOffline: 0,
+        action: "offline",
+        request: async () => 0,
+        reload: async () => { reloads++; },
+    });
+    assert.equal(out.kind, "empty");
+    assert.equal(out.affected, 0);
+    assert.equal(reloads, 1);
+});
+
+test("接口失败向上抛出，且不触发刷新", async () => {
+    let reloads = 0;
+    await assert.rejects(() => runLineAction({
+        flowGuid: "g6",
+        lineOffline: 0,
+        action: "offline",
+        request: async () => { throw new Error("无流程管理权限"); },
+        reload: async () => { reloads++; },
+    }), /无流程管理权限/);
+    assert.equal(reloads, 0);
+});
+
+test("操作成功但刷新失败：保留成功结果并标记 reloadFailed", async () => {
+    const out = await runLineAction({
+        flowGuid: "g7",
+        lineOffline: 1,
+        action: "enable",
+        request: async () => 1,
+        reload: async () => { throw new Error("网络异常"); },
+    });
+    assert.equal(out.kind, "updated");
+    assert.equal(out.affected, 1);
+    assert.equal(out.reloadFailed, true);
+});
+
+test("错误文案：权限/网络异常与后端业务错误分开提示", () => {
+    assert.match(lineActionErrorDetail("网络错误"), /权限/);
+    assert.match(lineActionErrorDetail("Failed to fetch"), /网络异常/);
+    assert.match(lineActionErrorDetail(""), /网络异常/);
+    assert.equal(lineActionErrorDetail("流程线不存在：g1"), "流程线不存在：g1");
+});
+
+test("静态接线：Defs.vue 使用线级接口，不混入 listAll 或重复查询", () => {
+    const defs = readFileSync(resolve(process.cwd(), "src/views/flow/admin/Defs.vue"), "utf8");
+    assert.match(defs, /defOfflineLine/);
+    assert.match(defs, /defEnableLine/);
+    assert.match(defs, /lineOffline/);
+    assert.match(defs, /停发流程线/);
+    assert.match(defs, /恢复流程线/);
+    assert.match(defs, /versionActions/);
+    assert.doesNotMatch(defs, /listAll/);
+});
+
+test("静态接线：API 客户端使用既有 admin 端点与 flowGuid 请求体", () => {
+    const api = readFileSync(resolve(process.cwd(), "src/api/module/flow.ts"), "utf8");
+    assert.match(api, /`\$\{ROOT\}\/admin\/def\/offlineLine`, \{ flowGuid \}/);
+    assert.match(api, /`\$\{ROOT\}\/admin\/def\/enableLine`, \{ flowGuid \}/);
+});