fix(show_html): freeze completed card during streaming

static/src/app/bootstrap.ts

@@ -565,6 +565,23 @@ function renderShowImages(root: ParentNode | null = document) {
     });
 
     let persistent = showHtmlPersistentRenderByPath.get(pathKey);
+    if (!persistent && effectiveEncoded && inStreaming) {
+      // 精确匹配
+      let ep = showHtmlPersistentByEncoded.get(effectiveEncoded);
+      // 前缀匹配：多条渲染源可能输出不同阶段的 encoded，用最长前缀匹配找到 COMPLETE 的 wrapper
+      if (!ep) {
+        let bestLen = 0;
+        for (const [key, val] of showHtmlPersistentByEncoded) {
+          if (key.startsWith(effectiveEncoded) && key.length > bestLen) {
+            ep = val; bestLen = key.length;
+          }
+        }
+      }
+      if (ep) {
+        persistent = { encoded: ep.encoded, ratioKey: ep.ratioKey, widthPx: ep.widthPx, heightPx: ep.heightPx, wrapper: ep.wrapper, host: ep.host, root: ep.root };
+        showHtmlPersistentRenderByPath.set(pathKey, persistent);
+      }
+    }
     if (!persistent) {
       const wrapper = document.createElement('div');
       wrapper.className = 'chat-inline-html';
@@ -615,17 +632,23 @@ function renderShowImages(root: ParentNode | null = document) {
 
     persistent.wrapper.style.width = `${widthPx}px`;
     persistent.host.style.height = `${heightPx}px`;
-    if (
+    const needsUpdate =
       persistent.encoded !== effectiveEncoded ||
       persistent.widthPx !== widthPx ||
       persistent.heightPx !== heightPx ||
-      persistent.ratioKey !== ratioKey
-    ) {
+      persistent.ratioKey !== ratioKey;
+    if (needsUpdate) {
       persistent.root.innerHTML = safeHtml;
       persistent.encoded = effectiveEncoded;
       persistent.widthPx = widthPx;
       persistent.heightPx = heightPx;
       persistent.ratioKey = ratioKey;
+      if (effectiveEncoded && inStreaming) {
+        showHtmlPersistentByEncoded.set(effectiveEncoded, {
+          wrapper: persistent.wrapper, host: persistent.host, root: persistent.root,
+          encoded: effectiveEncoded, ratioKey, widthPx, heightPx
+        });
+      }
       debugShowHtmlLog('render:node-persistent-update', {
         renderId,
         pathKey,
@@ -642,7 +665,9 @@ function renderShowImages(root: ParentNode | null = document) {
       });
     }
 
-    node.replaceChildren(persistent.wrapper);
+    if (!inStreaming || isPartial || needsUpdate || !node.hasAttribute('data-rendered')) {
+      node.replaceChildren(persistent.wrapper);
+    }
     node.setAttribute('data-rendered', '1');
     const rect = persistent.wrapper.getBoundingClientRect();
     debugShowHtmlLog('render:node-done', {
@@ -712,6 +737,10 @@ const showHtmlPersistentRenderByPath = new Map<
     root: HTMLElement
   }
 >();
+const showHtmlPersistentByEncoded = new Map<string, {
+  wrapper: HTMLElement, host: HTMLElement, root: HTMLElement,
+  encoded: string, ratioKey: string, widthPx: number, heightPx: number
+}>();
 let layoutDebugObserver: MutationObserver | null = null;
 let layoutDebugResizeObserver: ResizeObserver | null = null;
 let layoutDebugStarted = false;
@@ -1011,6 +1040,7 @@ export function teardownShowImageObserver() {
   showHtmlCompletedSnapshotByPath.clear();
   showHtmlStreamingSizeLockByPath.clear();
   showHtmlPersistentRenderByPath.clear();
+  showHtmlPersistentByEncoded.clear();
   showTagObservedContainer = null;
 }
 

static/src/stores/chat.ts

@@ -32,6 +32,13 @@ const GENERATING_LABELS = [
   '快敲完了，别急'
 ];
 
+const SHOW_HTML_COMPLETE_BLOCK_RE = /<show_html\b[\s\S]*?<\/show_html>/i;
+
+function hasCompletedShowHtmlBlock(content: string | null | undefined) {
+  if (!content) return false;
+  return SHOW_HTML_COMPLETE_BLOCK_RE.test(content);
+}
+
 function randomGeneratingLabel() {
   if (!GENERATING_LABELS.length) {
     return '';
@@ -249,6 +256,7 @@ export const useChatStore = defineStore('chat', {
       clearAwaitingFirstContent(msg);
       msg.streamingText = '';
       msg.currentStreamingType = 'text';
+      (msg as any).__splitByShowHtml = false;
       const action = {
         id: randomId('text'),
         type: 'text',
@@ -269,28 +277,58 @@ export const useChatStore = defineStore('chat', {
         msg.streamingText = '';
       }
       msg.streamingText += content;
-      const lastAction = msg.actions[msg.actions.length - 1];
-      if (lastAction && lastAction.type === 'text') {
-        lastAction.content += content;
-        return lastAction;
+      let lastAction = msg.actions[msg.actions.length - 1];
+      if (!(lastAction && lastAction.type === 'text' && lastAction.streaming)) {
+        lastAction = {
+          id: randomId('text'),
+          type: 'text',
+          content: '',
+          streaming: true,
+          timestamp: Date.now(),
+          continuation: true
+        };
+        msg.actions.push(lastAction);
       }
-      return null;
+      lastAction.content += content;
+
+      // show_html 一旦闭合，当前卡片应“定格”，后续 chunk 进入新的 text action，
+      // 避免 streaming 阶段每个新 chunk 都重建同一 show_html 卡片。
+      if (lastAction.streaming && hasCompletedShowHtmlBlock(lastAction.content)) {
+        lastAction.streaming = false;
+        lastAction.frozenByShowHtml = true;
+        (msg as any).__splitByShowHtml = true;
+      }
+
+      return lastAction;
     },
     completeText(fullContent: string) {
       if (this.currentMessageIndex < 0) return;
       const msg = this.messages[this.currentMessageIndex];
+      const splitByShowHtml = !!(msg as any).__splitByShowHtml;
+      let completedStreamingAction = false;
       for (let i = msg.actions.length - 1; i >= 0; i--) {
         const action = msg.actions[i];
         if (action.type === 'text' && action.streaming) {
           action.streaming = false;
-          if (typeof fullContent === 'string' && fullContent.length) {
+          completedStreamingAction = true;
+          if (!splitByShowHtml && typeof fullContent === 'string' && fullContent.length) {
             action.content = fullContent;
           }
           break;
         }
       }
+      if (!completedStreamingAction && !splitByShowHtml && typeof fullContent === 'string') {
+        for (let i = msg.actions.length - 1; i >= 0; i--) {
+          const action = msg.actions[i];
+          if (action.type === 'text') {
+            action.content = fullContent;
+            break;
+          }
+        }
+      }
       msg.streamingText = '';
       msg.currentStreamingType = null;
+      delete (msg as any).__splitByShowHtml;
     },
     addSystemMessage(content: string, meta: any = null) {
       // 与历史重建保持一致：子智能体/后台完成通知作为独立 assistant 消息渲染，

static/src/styles/components/chat/_chat-area.scss

@@ -937,7 +937,7 @@ body[data-theme='dark'] .more-icon {
     margin: 14px auto;
     border: 1px solid var(--claude-border);
     border-radius: 12px;
-    overflow: auto;
+    overflow: hidden;
     background: transparent;
     box-shadow: var(--claude-shadow);
 }
@@ -945,6 +945,7 @@ body[data-theme='dark'] .more-icon {
 .chat-inline-html__host {
     display: block;
     width: 100%;
+    overflow: hidden;
     border: 0;
     background: transparent;
 }