fix: clarify requirements document preview action

src/views/product/requirements-doc.vue

@@ -16,7 +16,7 @@
           </div>
           <div class="workbench-actions">
             <TrainingMaterialButton :material-name="taskConfig?.materialName" :material-url="taskConfig?.materialUrl" />
-            <button type="button" class="outline-action" @click="exportOutcome"><el-icon><Download /></el-icon>导出实训成果</button>
+            <button type="button" class="outline-action" @click="exportOutcome"><el-icon><Download /></el-icon>{{ currentStep === 3 ? '预览产品需求说明书' : '导出实训成果' }}</button>
           </div>
         </div>
 

tests/requirements-doc-submit.static.test.cjs

@@ -18,3 +18,8 @@ test("产品需求说明书最终提交保存完整答案并标记为已提交",
   assert.match(page, /产品需求文档已提交/);
   assert.match(page, /提交失败，请稍后重试/);
 });
+
+test("产品需求说明书第3步将顶部导出操作明确为文档预览", () => {
+  assert.match(page, /\{\{ currentStep === 3 \? '预览产品需求说明书' : '导出实训成果' \}\}/);
+  assert.match(page, /function exportOutcome\(\)[\s\S]*?currentStep\.value === 3 && isDocumentReady\.value\) \{ showDocumentPreview\.value = true;/);
+});