diff --git a/src/components/AiChat.vue b/src/components/AiChat.vue
index fd984bb..45f52c9 100644
--- a/src/components/AiChat.vue
+++ b/src/components/AiChat.vue
@@ -353,22 +353,34 @@ const streamingHtml = ref('')
 let rafId: number | null = null
 let lastStreamText = ''
 
-/// 切块:代码围栏(```...```)整体一块(跨双换行不切),非代码段按双换行切段。
+/// 切块:代码围栏(```...``` 或 3+ 反引号 + 行首可选空格 + info 字符串)整体一块
+/// (跨双换行不切),非代码段按双换行切段。
 /// 流式期末块可能不完整(未闭合围栏/半截段落),交给 parseBlockNoCache 每次重 parse。
+///
+/// CR-260615-04:旧实现用正则 /```[^\n]*\n[\s\S]*?(?:```|$)/ 切块,与 marked 围栏规则
+/// 不一致——不要求行首、固定 3 反引号,导致行中裸三反引号 / 4+ 反引号嵌套围栏切错,
+/// 前块缓存固化错误 html。改用 marked.lexer()(经 getMarked() 取 marked 实例)做围栏
+/// 感知切块:lexer 把代码围栏识别为单个 type==='code' token(.raw 含整段围栏),
+/// 段落/标题等其余 token 的 .raw 按 \n\n 切段。lexer 与 parse 用同一份 marked 实例 +
+/// 同一份围栏规则,切块边界与渲染边界一致。
 function splitBlocks(text: string): string[] {
+  const marked = getMarked()
   const blocks: string[] = []
-  const fenceRe = /```[^\n]*\n[\s\S]*?(?:```|$)/g
-  let last = 0
-  let m: RegExpExecArray | null
-  while ((m = fenceRe.exec(text)) !== null) {
-    if (m.index > last) {
-      for (const b of text.slice(last, m.index).split(/\n{2,}/)) if (b.trim()) blocks.push(b)
+  // marked 未就绪时 splitBlocks 不应被调用(renderStreamingMd 已 mdReady 守卫),
+  // 此处兜底返回原文,不引入正则。
+  if (!marked) return [text]
+  const tokens = marked.lexer(text)
+  for (const tok of tokens) {
+    if (!tok || typeof (tok as { raw?: string }).raw !== 'string') continue
+    const raw = (tok as { raw: string }).raw
+    if ((tok as { type: string }).type === 'code') {
+      // 代码围栏 token:整段一块(含行首可选空格 + 3+ 反引号 + info 字符串)
+      if (raw.trim()) blocks.push(raw)
+      continue
     }
-    blocks.push(m[0])
-    last = m.index + m[0].length
-  }
-  if (last < text.length) {
-    for (const b of text.slice(last).split(/\n{2,}/)) if (b.trim()) blocks.push(b)
+    // 非代码 token(paragraph/space/heading/list/blockquote/...):
+    // 按 \n\n 切段(段落内单换行不切,inline code 自然保留在段内)
+    for (const b of raw.split(/\n{2,}/)) if (b.trim()) blocks.push(b)
   }
   return blocks.length ? blocks : [text]
 }
@@ -718,9 +730,16 @@ watch(() => store.state.currentText, onContentChange)
 // 流式 Markdown 渲染驱动(ARC-260615-08 块级 memo):
 // - currentText 变化(每 delta):rAF 节流 scheduleStreamParse,块级 memo 只重 parse 末块
 // - streaming 翻转:结束清 rAF + 清 streamingHtml(回 renderMd 走 final marked + 缓存)
+// - mdReady 翻转(CR-260615-06):首屏 marked 慢 + 暂无新 delta 时末段停留 escapeFallback
+//   纯文本;marked 就绪后主动重算一次,使纯文本转格式化
 watch(() => store.state.currentText, (text) => {
   if (store.state.streaming && text) scheduleStreamParse(text)
 })
+watch(mdReady, (ready) => {
+  if (ready && store.state.streaming && store.state.currentText) {
+    scheduleStreamParse(store.state.currentText)
+  }
+})
 watch(() => store.state.streaming, (s) => {
   if (rafId !== null) { cancelAnimationFrame(rafId); rafId = null }
   if (!s) { streamingHtml.value = ''; lastStreamText = '' }
diff --git a/src/composables/useMarkdown.ts b/src/composables/useMarkdown.ts
index 48df959..215c07d 100644
--- a/src/composables/useMarkdown.ts
+++ b/src/composables/useMarkdown.ts
@@ -17,7 +17,7 @@
 //! scheduleStreamParse)继续调用 useMarkdown 暴露的 mdReady/escapeFallback,
 //! 渲染结果不变。
 
-import { ref } from 'vue'
+import { computed, ref, type ComputedRef } from 'vue'
 
 // ═══ 模块级单例:AiChat 流式核心与历史 renderMd 共享同一份渲染器/缓存 ═══
 let _marked: typeof import('marked')['marked'] | null = null
@@ -26,17 +26,17 @@ const mdReady = ref(false)
 // 历史消息整段缓存(文本不变,重渲染命中省去 marked+sanitize 全量解析)
 const _mdCache = new Map<string, string>()
 
-export function useMarkdown() {
-  /** 异步加载 marked + DOMPurify;加载完成后 mdReady 翻转触发重渲染 */
-  async function loadMarkdown() {
-    const [{ marked }, dp] = await Promise.all([import('marked'), import('dompurify')])
-    marked.setOptions({ breaks: true, gfm: true })
-    _marked = marked
-    _purify = dp.default
-    _mdCache.clear() // 渲染器就绪,清兜底缓存触发完整重渲染
-    mdReady.value = true
-  }
+/** 异步加载 marked + DOMPurify;加载完成后 mdReady 翻转触发重渲染(模块级,所有调用方共享) */
+async function loadMarkdown() {
+  const [{ marked }, dp] = await Promise.all([import('marked'), import('dompurify')])
+  marked.setOptions({ breaks: true, gfm: true })
+  _marked = marked
+  _purify = dp.default
+  _mdCache.clear() // 渲染器就绪,清兜底缓存触发完整重渲染
+  mdReady.value = true
+}
 
+export function useMarkdown() {
   return {
     mdReady,
     loadMarkdown,
@@ -50,6 +50,37 @@ export function useMarkdown() {
   }
 }
 
+/**
+ * 详情页 Markdown 渲染辅助:封装 computed(读 mdReady 触发响应式 + renderMd(getText))
+ * + ensureLoaded(幂等预热 loadMarkdown)。消除 TaskDetail/ProjectDetail/Ideas/Knowledge
+ * 四视图手写 computed + onMounted(loadMarkdown) 重复。
+ *
+ * - getText: 返回待渲染文本(通常读响应式 source.value?.description ?? ''),
+ *   文本变化时 computed 重算。
+ * - rendered: computed<string>,mdReady 翻转/文本变化触发重渲染,行为与抽前一致。
+ * - ensureLoaded():幂等触发后台预热,首次调用执行 loadMarkdown,后续 no-op。
+ *
+ * 行为零变化:渲染/预热逻辑未改,仅 DRY 抽取。
+ */
+export function useRendered(getText: () => string): {
+  rendered: ComputedRef<string>
+  ensureLoaded: () => void
+} {
+  const rendered = computed(() => {
+    void mdReady.value // 触发响应式依赖:mdReady 翻转时 computed 重算
+    return renderMd(getText())
+  })
+
+  let loaded = false
+  function ensureLoaded() {
+    if (loaded) return
+    loaded = true
+    loadMarkdown()
+  }
+
+  return { rendered, ensureLoaded }
+}
+
 function escapeHtml(text: string): string {
   return text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
 }
diff --git a/src/views/Ideas.vue b/src/views/Ideas.vue
index ba6d283..0990692 100644
--- a/src/views/Ideas.vue
+++ b/src/views/Ideas.vue
@@ -214,19 +214,9 @@ import { useProjectStore } from '../stores/project'
 import { formatDate } from '../utils/time'
 import ConfirmDialog from '../components/ConfirmDialog.vue'
 import { useConfirm } from '../composables/useConfirm'
-import { useMarkdown } from '../composables/useMarkdown'
+import { useRendered } from '../composables/useMarkdown'
 import type { IdeaRecord } from '../api/types'
 
-// B-260615-25:灵感描述 Markdown 渲染(复用 AiChat/TaskDetail 同款渲染器,模块级单例)
-const { renderMd, loadMarkdown, mdReady } = useMarkdown()
-
-// 描述渲染依赖 mdReady 响应式:loadMarkdown 完成前 escapeFallback 纯文本,完成后 mdReady 翻转
-// 触发 computed 重算(B-25 漏响应式致 v-html=renderMd 首次纯文本后不重算,代码块不渲染)
-const renderedDesc = computed(() => {
-  void mdReady.value
-  return renderMd(currentIdea.value?.description ?? '')
-})
-
 const { t } = useI18n()
 const router = useRouter()
 const store = useProjectStore()
@@ -295,6 +285,12 @@ const currentIdea = computed(() => {
   return store.ideas.find(i => i.id === selectedId.value) ?? null
 })
 
+// B-260615-25:灵感描述 Markdown 渲染(复用 AiChat/TaskDetail 同款渲染器,模块级单例),
+// useRendered 封装 computed(读 mdReady 触发响应式 + renderMd)+ ensureLoaded(幂等预热)
+const { rendered: renderedDesc, ensureLoaded } = useRendered(
+  () => currentIdea.value?.description ?? '',
+)
+
 const currentStatus = computed(() => {
   return currentIdea.value?.status || 'draft'
 })
@@ -450,7 +446,7 @@ async function onStatusChange(e: Event) {
 }
 
 onMounted(async () => {
-  loadMarkdown() // 后台预热 Markdown 渲染器(模块单例,与 AiChat/TaskDetail 共享),不阻塞
+  ensureLoaded() // 后台预热 Markdown 渲染器(模块单例,与 AiChat/TaskDetail 共享),不阻塞
   await store.loadIdeas()
 })
 </script>
diff --git a/src/views/Knowledge.vue b/src/views/Knowledge.vue
index 06bd804..edce7c5 100644
--- a/src/views/Knowledge.vue
+++ b/src/views/Knowledge.vue
@@ -235,22 +235,12 @@
 import { ref, computed, onMounted, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useKnowledgeStore, KNOWLEDGE_KINDS, parseTags } from '../stores/knowledge'
-import { useMarkdown } from '../composables/useMarkdown'
+import { useRendered } from '../composables/useMarkdown'
 import type { KnowledgeDetailPayload, KnowledgeEventRecord } from '../api/types'
 
 const { t } = useI18n()
 const store = useKnowledgeStore()
 
-// B-260615-25:知识内容 Markdown 渲染(复用 AiChat/TaskDetail 同款渲染器,模块级单例)
-const { renderMd, loadMarkdown, mdReady } = useMarkdown()
-
-// 内容渲染依赖 mdReady 响应式:loadMarkdown 完成前 escapeFallback 纯文本,完成后 mdReady 翻转
-// 触发 computed 重算(B-25 漏响应式致 v-html=renderMd 首次纯文本后不重算,代码块不渲染)
-const renderedContent = computed(() => {
-  void mdReady.value
-  return renderMd(detail.value?.knowledge.content ?? '')
-})
-
 // 顶层 Tab: library(知识库) | inbox(审核收件箱)
 const topTab = ref<'library' | 'inbox'>('library')
 
@@ -309,6 +299,11 @@ function getCategoryCount(key: string): number {
 // ===== 详情选中 + 加载 =====
 const selectedId = ref<string | null>(null)
 const detail = ref<KnowledgeDetailPayload | null>(null)
+// B-260615-25:知识内容 Markdown 渲染(复用 AiChat/TaskDetail 同款渲染器,模块级单例),
+// useRendered 封装 computed(读 mdReady 触发响应式 + renderMd)+ ensureLoaded(幂等预热)
+const { rendered: renderedContent, ensureLoaded } = useRendered(
+  () => detail.value?.knowledge.content ?? '',
+)
 const refLimit = ref(10)
 
 async function selectKnowledge(id: string) {
@@ -512,7 +507,7 @@ function relativeTime(millisStr: string): string {
 }
 
 onMounted(() => {
-  loadMarkdown() // 后台预热 Markdown 渲染器(模块单例,与 AiChat/TaskDetail 共享),不阻塞
+  ensureLoaded() // 后台预热 Markdown 渲染器(模块单例,与 AiChat/TaskDetail 共享),不阻塞
   store.loadList()
   store.loadCandidates()
 })
diff --git a/src/views/ProjectDetail.vue b/src/views/ProjectDetail.vue
index 590e5e9..1288cbb 100644
--- a/src/views/ProjectDetail.vue
+++ b/src/views/ProjectDetail.vue
@@ -241,17 +241,7 @@ import { parseStack } from '../utils/project'
 import { projectStatusLabel, projectStageInfo, taskStatusLabel, taskStatusClass } from '../constants/project'
 import ConfirmDialog from '../components/ConfirmDialog.vue'
 import { useConfirm } from '../composables/useConfirm'
-import { useMarkdown } from '../composables/useMarkdown'
-
-// B-260615-25:项目描述 Markdown 渲染(复用 AiChat/TaskDetail 同款渲染器,模块级单例)
-const { renderMd, loadMarkdown, mdReady } = useMarkdown()
-
-// 描述渲染依赖 mdReady 响应式:loadMarkdown 完成前 escapeFallback 纯文本,完成后 mdReady 翻转
-// 触发 computed 重算(B-25 漏响应式致 v-html=renderMd 首次纯文本后不重算,代码块不渲染)
-const renderedDesc = computed(() => {
-  void mdReady.value
-  return renderMd(currentProject.value?.description ?? '')
-})
+import { useRendered } from '../composables/useMarkdown'
 
 const route = useRoute()
 const router = useRouter()
@@ -280,6 +270,11 @@ const projectId = computed(() => route.params.id as string)
 const currentProject = computed(() =>
   store.projects.find(p => p.id === projectId.value)
 )
+// B-260615-25:项目描述 Markdown 渲染(复用 AiChat/TaskDetail 同款渲染器,模块级单例),
+// useRendered 封装 computed(读 mdReady 触发响应式 + renderMd)+ ensureLoaded(幂等预热)
+const { rendered: renderedDesc, ensureLoaded: ensureMdLoaded } = useRendered(
+  () => currentProject.value?.description ?? '',
+)
 const stageKey = computed(() => currentProject.value?.status ?? 'planning')
 const statusLabel = computed(() => projectStatusLabel(stageKey.value))
 const currentStageIndex = computed(() => projectStageInfo(stageKey.value).stepIndex)
@@ -462,7 +457,7 @@ watch(() => store.pendingApproval, (newApproval) => {
 
 // ── 生命周期 ──
 onMounted(async () => {
-  loadMarkdown() // 后台预热 Markdown 渲染器(模块单例,与 AiChat/TaskDetail 共享),不阻塞
+  ensureMdLoaded() // 后台预热 Markdown 渲染器(模块单例,与 AiChat/TaskDetail 共享),不阻塞
   await store.loadProjects()
   await store.loadTasks() // 全量加载,详情页用 computed 过滤本项目(避免覆盖全局 tasks 单例)
   unlisten = await store.startEventListener()
diff --git a/src/views/TaskDetail.vue b/src/views/TaskDetail.vue
index 10ff038..412c08e 100644
--- a/src/views/TaskDetail.vue
+++ b/src/views/TaskDetail.vue
@@ -99,7 +99,7 @@ import { ref, computed, onMounted, watch } from 'vue'
 import { useRoute } from 'vue-router'
 import { taskApi, projectApi } from '../api'
 import { formatDate } from '../utils/time'
-import { useMarkdown } from '../composables/useMarkdown'
+import { useRendered } from '../composables/useMarkdown'
 import {
   taskStatusLabel,
   taskStatusClass,
@@ -108,16 +108,6 @@ import {
 } from '../constants/project'
 import type { TaskRecord, ProjectRecord } from '../api/types'
 
-// B-24:任务描述 Markdown 渲染(复用 AiChat 同款渲染器,模块级单例)
-const { renderMd, loadMarkdown, mdReady } = useMarkdown()
-
-// 描述渲染依赖 mdReady 响应式:loadMarkdown 完成前 escapeFallback 纯文本,完成后 mdReady 翻转
-// 触发 computed 重算(B-24 漏响应式致 v-html=renderMd 首次纯文本后不重算,代码块不渲染)
-const renderedDescription = computed(() => {
-  void mdReady.value
-  return renderMd(task.value?.description ?? '')
-})
-
 const route = useRoute()
 
 const loading = ref(true)
@@ -127,6 +117,12 @@ const projects = ref<ProjectRecord[]>([])
 
 const taskId = computed(() => route.params.id as string)
 
+// B-24:任务描述 Markdown 渲染(复用 AiChat 同款渲染器,模块级单例),useRendered 封装
+// computed(读 mdReady 触发响应式 + renderMd)+ ensureLoaded(幂等预热)
+const { rendered: renderedDescription, ensureLoaded } = useRendered(
+  () => task.value?.description ?? '',
+)
+
 const projectName = computed(() => {
   const p = projects.value.find(p => p.id === task.value?.project_id)
   return p?.name ?? task.value?.project_id ?? '—'
@@ -159,7 +155,7 @@ function refresh() {
 watch(taskId, () => { load() })
 
 onMounted(() => {
-  loadMarkdown() // 后台预热 Markdown 渲染器(模块单例,与 AiChat 共享),不阻塞 load
+  ensureLoaded() // 后台预热 Markdown 渲染器(模块单例,与 AiChat 共享),不阻塞 load
   load()
 })
 </script>