feat: 增加工作流编排临时草稿缓存

- 按当前标签页缓存并静默恢复未保存的工作流编排

- 优化试运行抽屉层级、窄屏宽度与长结果滚动

- 覆盖版本变化、缓存异常与保存竞态场景

easyflow-ui-admin/app/src/views/ai/workflow/components/SingleRun.vue

@@ -93,8 +93,13 @@ function submit() {
 </script>
 
 <template>
-  <div>
-    <ElForm label-position="top" ref="singleRunForm" :model="runParams">
+  <div class="single-run">
+    <ElForm
+      class="single-run__form"
+      label-position="top"
+      ref="singleRunForm"
+      :model="runParams"
+    >
       <template v-if="isFieldMode">
         <div class="single-run-section">
           <div class="single-run-section__title">字段值</div>
@@ -176,12 +181,45 @@ function submit() {
         </ElButton>
       </ElFormItem>
     </ElForm>
-    <div class="mb-2.5 mt-2.5 font-semibold">{{ $t('workflow.result') }}：</div>
-    <ShowJson :value="result" />
+    <section class="single-run-result">
+      <div class="single-run-result__title">{{ $t('workflow.result') }}：</div>
+      <ShowJson class="single-run-result__viewer" :value="result" />
+    </section>
   </div>
 </template>
 
 <style scoped>
+.single-run {
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+  min-height: 100%;
+}
+
+.single-run__form {
+  flex: 0 0 auto;
+}
+
+.single-run-result {
+  display: flex;
+  flex: 1;
+  flex-direction: column;
+  min-width: 0;
+  min-height: 240px;
+}
+
+.single-run-result__title {
+  margin: 10px 0;
+  font-weight: 600;
+}
+
+.single-run-result__viewer {
+  max-width: 100%;
+  max-height: min(60vh, 720px);
+  overflow: auto;
+  overscroll-behavior: contain;
+}
+
 .single-run-section + .single-run-section {
   margin-top: 20px;
 }