fix(frontend): 版本对比左栏不显示——根因monaco 0.56 createDiffEditor在抽屉嵌套容器里分栏测量错误(original栏恒被压36px;时序延迟挂载/layout强制重算/禁拖拽分栏/内联模式四招全试均无效,实测panes 36/748);换双只读编辑器并排各50%(快照|当前,带栏头标签+滚动联动),复用主编辑器同款主题;showDiff延迟360ms等抽屉动画后挂载(容器全宽创建);dev实测panes 408/407左右内容正确 [nas]

frontend/src/views/strategy/Code.vue

@@ -139,6 +139,7 @@ function runBacktest(): void {
 const versions = ref<CodeVersion[]>([])
 const versionsOpen = ref(false)
 const diffCode = ref<string | null>(null)
+const diffReady = ref(false)
 const versionsLoading = ref(false)
 
 async function openVersions(): Promise<void> {
@@ -146,6 +147,7 @@ async function openVersions(): Promise<void> {
   versionsOpen.value = true
   versionsLoading.value = true
   diffCode.value = null
+  diffReady.value = false
   try {
     versions.value = await getCodeVersions(active.value.name)
   } catch {
@@ -157,8 +159,12 @@ async function openVersions(): Promise<void> {
 
 async function showDiff(h8: string): Promise<void> {
   if (!active.value) return
+  diffReady.value = false
   try {
     diffCode.value = await getCodeVersion(active.value.name, h8)
+    // 抽屉展开动画(~300ms)期间容器宽为 0,Monaco diff 在其中创建会把左右分栏算死
+    // (左栏被压扁且事后 layout() 救不回)。等动画结束容器全宽后再挂载组件。
+    setTimeout(() => { diffReady.value = true }, 360)
   } catch {
     ElMessage.error('读取版本失败')
   }
@@ -245,8 +251,8 @@ async function showDiff(h8: string): Promise<void> {
         <span class="muted mono" style="font-size:11px">{{ (v.size / 1024).toFixed(1) }} KB</span>
         <button class="term-btn sm" style="margin-left:auto" @click="showDiff(v.code_version)">对比当前</button>
       </div>
-      <div v-if="diffCode != null" class="ver-diff">
-        <div class="muted mono" style="font-size:11px;margin-bottom:6px">左=快照版本 · 右=当前代码</div>
+      <div v-if="diffCode != null && diffReady" class="ver-diff">
+        <div class="muted mono" style="font-size:11px;margin-bottom:6px">左右滚动联动 · 快照 vs 当前</div>
         <MonacoDiff :original="diffCode" :modified="code" />
       </div>
       </div>