桌面 GUI 外链修复 + 主题顺序调整（含结构扁平化进行中的工作区基线）

- 集成 tauri-plugin-opener：Cargo/lib.rs/capabilities/npm 四处接线，新增 src/openExternal.ts（桌面走 opener，浏览器回退 window.open，相对路径绝对化）
- 关于页 4 个链接、活动栏官网菜单、代理错误横幅 2 处健康检查链接全部改走 openExternal，桌面端可正常跳转
- 设置→外观 主题顺序调整为 深色/浅色/跟随系统
- release 二进制重编并验证（浏览器实测关于页链接可开文档页）
- 附带工作区中未提交的扁平化重构现状（另一会话进行中）
- homepage 落地页与文档终检通过（8787 / 与 /docs 双 200）

src/testRunner.ts

@@ -0,0 +1,137 @@
+import { executeOnce } from "./features/testing/execution";
+/**
+ * 用例执行器：串行执行步骤 → 断言 → 变量提取 → 生成报告。
+ * 与手动发送共用 buildHttpSpec（含环境变量与 Mock）。
+ */
+import type {
+  CollectionNode,
+  HttpSpec,
+  RequestNode,
+  TestRun,
+  TestRunTrigger,
+  TestStep,
+  TestStepResult,
+} from "./core/index";
+import { evaluateAssertion, extractVariables } from "./core/index";
+import { buildHttpSpec } from "./send";
+import { activeEnvBaseUrl, activeEnvMap, useWorkspace } from "./workspaceStore";
+
+async function getTransportFn() {
+  const { detectTransport } = await import("./transport/index");
+  const { transport } = detectTransport({ ginBaseUrl: "" });
+  return transport.http.bind(transport);
+}
+
+function stepLabel(step: TestStep, node: RequestNode | undefined): string {
+  return node?.name ?? "（接口已被删除）";
+}
+
+/** 执行单个用例并写入运行记录；返回本次报告 */
+export function runTestCase(caseId: string, trigger: TestRunTrigger): Promise<TestRun | null> {
+  return executeOnce(caseId, () => executeTestCase(caseId, trigger));
+}
+
+async function executeTestCase(caseId: string, trigger: TestRunTrigger): Promise<TestRun | null> {
+  const tc = useWorkspace.getState().testCases.find((c) => c.id === caseId);
+  if (!tc) return null;
+
+  const http = await getTransportFn();
+  const started = performance.now();
+  const stepResults: TestStepResult[] = [];
+
+  for (const step of tc.steps) {
+    if (!step.enabled) continue;
+    const node = findRequestNode(step.nodeId);
+    if (!node || node.kind !== "http") {
+      stepResults.push({
+        stepId: step.id,
+        name: stepLabel(step, node),
+        method: "—",
+        url: "—",
+        ok: false,
+        httpStatus: null,
+        durationMs: null,
+        error: node ? "仅支持 HTTP 步骤" : "接口不存在或已被删除",
+        assertionResults: [],
+      });
+      if (!tc.continueOnFailure) break;
+      continue;
+    }
+
+    const env = activeEnvMap();
+    const { timeoutMs, mock } = useWorkspace.getState().settings;
+    const spec: HttpSpec = buildHttpSpec(node.data, env, timeoutMs, mock, activeEnvBaseUrl());
+    const t0 = performance.now();
+    try {
+      const res = await http(spec);
+      const durationMs = Math.round(performance.now() - t0);
+      const stepRes: TestStepResult = {
+        stepId: step.id,
+        name: node.name,
+        method: spec.method,
+        url: spec.url,
+        ok: true,
+        httpStatus: res.status,
+        durationMs,
+        error: null,
+        assertionResults: step.assertions
+          .filter((a) => a.enabled)
+          .map((a) => evaluateAssertion(res, a)),
+      };
+      stepRes.ok = stepRes.assertionResults.every((a) => a.passed);
+
+      // 变量提取 → 写入当前环境
+      const extracted = extractVariables(res, step.extracts);
+      if (Object.keys(extracted).length) {
+        useWorkspace.getState().setEnvValues(extracted);
+      }
+      stepResults.push(stepRes);
+      if (!stepRes.ok && !tc.continueOnFailure) break;
+    } catch (e) {
+      stepResults.push({
+        stepId: step.id,
+        name: node.name,
+        method: spec.method,
+        url: spec.url,
+        ok: false,
+        httpStatus: null,
+        durationMs: Math.round(performance.now() - t0),
+        error: e instanceof Error ? e.message : String(e),
+        assertionResults: [],
+      });
+      if (!tc.continueOnFailure) break;
+    }
+  }
+
+  const run: TestRun = {
+    id: crypto.randomUUID(),
+    caseId: tc.id,
+    caseName: tc.name,
+    at: Date.now(),
+    trigger,
+    totalMs: Math.round(performance.now() - started),
+    passed: stepResults.length > 0 && stepResults.every((s) => s.ok),
+    stepResults,
+  };
+  useWorkspace.getState().addTestRun(run);
+  return run;
+}
+
+function findRequestNode(id: string): RequestNode | undefined {
+  const { collections } = useWorkspace.getState();
+  const walk = (nodes: CollectionNode[]): RequestNode | undefined => {
+    for (const n of nodes) {
+      if (n.type === "request" && n.id === id) return n;
+      if (n.type === "folder") {
+        const hit = walk(n.children);
+        if (hit) return hit;
+      }
+    }
+    return undefined;
+  };
+  for (const c of collections) {
+    const hit = walk(c.children);
+    if (hit) return hit;
+  }
+  return undefined;
+}