fix: 修复流式输出展开状态被覆盖

- 保留智能体思考内容的手动展开与关闭选择

- 工作流试运行默认跟随当前节点，并允许用户自由多开或关闭

easyflow-ui-admin/packages/effects/common-ui/src/components/chat-timeline/ChatTimelineItem.vue

@@ -7,7 +7,7 @@ import type {
   ChatTimelineToolApprovalPayload,
 } from './types';
 
-import { computed } from 'vue';
+import { computed, ref } from 'vue';
 
 import ChatThinkingBlock from '../chat-thinking/ChatThinkingBlock.vue';
 import ChatErrorNotice from './ChatErrorNotice.vue';
@@ -43,6 +43,8 @@ const emit = defineEmits<{
 const messageItem = computed(() =>
   props.item.type === 'message' ? props.item : undefined,
 );
+// 流式快照会替换消息对象，用户手动选择需要由稳定的组件实例单独保留。
+const thinkingExpandedOverrides = ref<Record<string, boolean>>({});
 
 const alignmentClass = computed(() => {
   if (props.item.type === 'message' && props.item.role === 'user') {
@@ -115,11 +117,25 @@ function updateThinkingExpanded(partId: string, expanded: boolean) {
   }
   const part = item.parts.find((current) => current.id === partId);
   if (part?.type === 'thinking') {
+    thinkingExpandedOverrides.value = {
+      ...thinkingExpandedOverrides.value,
+      [partId]: expanded,
+    };
     emit('thinkingToggle');
     part.expanded = expanded;
   }
 }
 
+function resolveThinkingExpanded(
+  part: Extract<ChatTimelineMessagePart, { type: 'thinking' }>,
+) {
+  return (
+    thinkingExpandedOverrides.value[part.id] ??
+    part.expanded ??
+    part.status === 'thinking'
+  );
+}
+
 function handleCopyAction() {
   const item = messageItem.value;
   if (!item || !props.copyAction) {
@@ -149,7 +165,7 @@ function handleCopyAction() {
         <ChatThinkingBlock
           v-if="part.type === 'thinking'"
           :content="part.content"
-          :expanded="part.expanded ?? part.status === 'thinking'"
+          :expanded="resolveThinkingExpanded(part)"
           :status="part.status"
           class="chat-timeline-item__thinking"
           readonly