diff --git a/src/views/im/home/pages/conversation/components/message/MessageBubble.vue b/src/views/im/home/pages/conversation/components/message/MessageBubble.vue
index 2ce436426..ecbaaa030 100644
--- a/src/views/im/home/pages/conversation/components/message/MessageBubble.vue
+++ b/src/views/im/home/pages/conversation/components/message/MessageBubble.vue
@@ -215,21 +215,27 @@ const isUploading = computed(() => props.uploadProgress != null)
 const uploadProgress = computed(() => props.uploadProgress ?? 0)
 const uploadProgressText = computed(() => `${uploadProgress.value}%`)
 
-/** 各 payload */
-const textPayload = computed(() => (isText.value ? parseMessage<TextMessage>(props.content) : null))
+/**
+ * 单一 parse 入口：content 一变只 parse 一次，按 type 分发到下面 7 个 payload
+ *
+ * 各类型 payload 共用同一棵 JSON 树，避免 7 个 computed 各自重 parse 同一份 content
+ */
+const parsedContent = computed<unknown>(() => parseMessage(props.content))
+
+const textPayload = computed(() => (isText.value ? (parsedContent.value as TextMessage | null) : null))
 const imagePayload = computed(() =>
-  isImage.value ? parseMessage<ImageMessage>(props.content) : null
+  isImage.value ? (parsedContent.value as ImageMessage | null) : null
 )
-const filePayload = computed(() => (isFile.value ? parseMessage<FileMessage>(props.content) : null))
+const filePayload = computed(() => (isFile.value ? (parsedContent.value as FileMessage | null) : null))
 const voicePayload = computed(() =>
-  isVoice.value ? parseMessage<AudioMessage>(props.content) : null
+  isVoice.value ? (parsedContent.value as AudioMessage | null) : null
 )
 const videoPayload = computed(() =>
-  isVideo.value ? parseMessage<VideoMessage>(props.content) : null
+  isVideo.value ? (parsedContent.value as VideoMessage | null) : null
 )
-const cardPayload = computed(() => (isCard.value ? parseMessage<CardMessage>(props.content) : null))
+const cardPayload = computed(() => (isCard.value ? (parsedContent.value as CardMessage | null) : null))
 const mergePayload = computed(() =>
-  isMerge.value ? parseMessage<MergeMessage>(props.content) : null
+  isMerge.value ? (parsedContent.value as MergeMessage | null) : null
 )
 
 /** 合并消息内嵌前 N 条派生「{昵称}：{摘要}」 */
@@ -248,7 +254,7 @@ const facePayload = computed(() => {
   if (!isFace.value) {
     return null
   }
-  const raw = parseMessage<FaceMessage>(props.content)
+  const raw = parsedContent.value as FaceMessage | null
   if (!raw) {
     return null
   }
@@ -324,3 +330,50 @@ onBeforeUnmount(() => {
   voicePlaying.value = false
 })
 </script>
+
+<style scoped>
+/* 气泡尾巴：小三角伪元素，指向对应头像（对方在左、自己在右）
+   border 4 边色画三角：透明 3 边 + 实色 1 边，省一张图片；颜色与气泡背景对应，留 1px 视觉吃进去 */
+.message-bubble--other::before,
+.message-bubble--self::before {
+  content: '';
+  position: absolute;
+  top: 12px;
+  width: 0;
+  height: 0;
+  border-style: solid;
+}
+.message-bubble--other::before {
+  left: -5px;
+  border-width: 5px 6px 5px 0;
+  border-color: transparent var(--el-fill-color-light) transparent transparent;
+}
+.message-bubble--self::before {
+  right: -5px;
+  border-width: 5px 0 5px 6px;
+  border-color: transparent transparent transparent #95ec69;
+}
+
+/* el-icon 在暗色模式下全局 color 被 .el-icon{color:var(--color)} 干扰，把 voice 图标 fill 锁死 */
+.message-bubble__voice-icon :deep(svg) {
+  fill: #606266 !important;
+}
+.message-bubble__voice-icon.im-voice-playing :deep(svg) {
+  fill: #409eff !important;
+}
+
+/* 播放中的脉冲动画 */
+.im-voice-playing {
+  animation: im-voice-icon-pulse 0.8s infinite;
+}
+
+@keyframes im-voice-icon-pulse {
+  0%,
+  100% {
+    transform: scale(1);
+  }
+  50% {
+    transform: scale(1.15);
+  }
+}
+</style>
diff --git a/src/views/im/home/pages/conversation/components/message/MessageItem.vue b/src/views/im/home/pages/conversation/components/message/MessageItem.vue
index c52e89c95..b5b34a1e3 100644
--- a/src/views/im/home/pages/conversation/components/message/MessageItem.vue
+++ b/src/views/im/home/pages/conversation/components/message/MessageItem.vue
@@ -861,55 +861,7 @@ function handleDelete() {
 </script>
 
 <style scoped>
-/* 气泡尾巴：小三角伪元素，指向对应头像（对方在左、自己在右），对齐微信观感
-   - 用 border 4 边色画三角：透明 3 边 + 实色 1 边，省一张图片
-   - 颜色对应气泡背景，留 1px 视觉吃进去；UnoCSS 写不顺手，索性用 scoped CSS */
-.message-bubble--other::before,
-.message-bubble--self::before {
-  content: '';
-  position: absolute;
-  top: 12px;
-  width: 0;
-  height: 0;
-  border-style: solid;
-}
-.message-bubble--other::before {
-  left: -5px;
-  border-width: 5px 6px 5px 0;
-  border-color: transparent var(--el-fill-color-light) transparent transparent;
-}
-.message-bubble--self::before {
-  right: -5px;
-  border-width: 5px 0 5px 6px;
-  border-color: transparent transparent transparent #95ec69;
-}
-
-/* el-icon 在暗色模式下全局 color 被 .el-icon{color:var(--color)} 干扰；
-   这里把 voice 图标的 fill 锁死，避免字体色跟随主题变白；
-   file 图标已迁到 Iconify 按扩展名走彩色，不在这里强制 */
-.message-bubble__voice-icon :deep(svg) {
-  fill: #606266 !important;
-}
-.message-bubble__voice-icon.im-voice-playing :deep(svg) {
-  fill: #409eff !important;
-}
-
-/* 播放中的脉冲动画：keyframes 用 UnoCSS 不好写，保留 scoped */
-.im-voice-playing {
-  animation: im-voice-icon-pulse 0.8s infinite;
-}
-
-@keyframes im-voice-icon-pulse {
-  0%,
-  100% {
-    transform: scale(1);
-  }
-  50% {
-    transform: scale(1.15);
-  }
-}
-
-/* SENDING 状态的转圈动画：el-icon 自带 .is-loading 旋转，迁到 Iconify 后丢了，自己补一份 */
+/* SENDING 状态的转圈动画 */
 .im-loading-spin {
   animation: im-loading-spin 1s linear infinite;
 }
diff --git a/src/views/im/home/pages/conversation/components/message/MessagePanel.vue b/src/views/im/home/pages/conversation/components/message/MessagePanel.vue
index 20282d5b7..2d1fbbc6c 100644
--- a/src/views/im/home/pages/conversation/components/message/MessagePanel.vue
+++ b/src/views/im/home/pages/conversation/components/message/MessagePanel.vue
@@ -228,9 +228,12 @@ provide(IM_MERGE_DETAIL_DIALOG_KEY, (content) => mergeDetailDialogRef.value?.ope
 
 const multiSelect = useMessageMultiSelect()
 
-/** 切会话退出多选；避免上一会话的勾选状态泄漏到新会话 */
+/** 切会话退出多选；避免上一会话的勾选状态泄漏到新会话（type+targetId 一起监听，私聊与群聊 id 同号时也能触发） */
 watch(
-  () => conversationStore.activeConversation?.targetId,
+  () => [
+    conversationStore.activeConversation?.type,
+    conversationStore.activeConversation?.targetId
+  ],
   () => multiSelect.exit()
 )
 
diff --git a/src/views/im/manager/message/MessageContentPreview.vue b/src/views/im/manager/message/MessageContentPreview.vue
index 59bc8012a..25ecc17fd 100644
--- a/src/views/im/manager/message/MessageContentPreview.vue
+++ b/src/views/im/manager/message/MessageContentPreview.vue
@@ -137,6 +137,7 @@ import {
 import CardLineLabel from '@/views/im/home/components/card/CardLineLabel.vue'
 import {
   parseMessage,
+  getFileIconInfo,
   type ImageMessage,
   type FileMessage,
   type AudioMessage,
@@ -218,39 +219,8 @@ function openVideo() {
   }
 }
 
-/** 文件图标：按扩展名分配 icon + 颜色，对齐 home 端 MessageItem 的观感 */
-const fileIconInfo = computed<{ icon: string; color: string }>(() => {
-  const name = filePayload.value?.name || ''
-  const ext = name.split('.').pop()?.toLowerCase() || ''
-  if (ext === 'pdf') {
-    return { icon: 'ant-design:file-pdf-filled', color: '#ed5757' }
-  }
-  if (['doc', 'docx'].includes(ext)) {
-    return { icon: 'ant-design:file-word-filled', color: '#2b7cd3' }
-  }
-  if (['xls', 'xlsx'].includes(ext)) {
-    return { icon: 'ant-design:file-excel-filled', color: '#1f7244' }
-  }
-  if (['ppt', 'pptx'].includes(ext)) {
-    return { icon: 'ant-design:file-ppt-filled', color: '#d24726' }
-  }
-  if (['zip', 'rar', '7z', 'tar', 'gz'].includes(ext)) {
-    return { icon: 'ant-design:file-zip-filled', color: '#f0ad4e' }
-  }
-  if (['jpg', 'jpeg', 'png', 'gif', 'bmp', 'webp', 'svg'].includes(ext)) {
-    return { icon: 'ant-design:file-image-filled', color: '#9c27b0' }
-  }
-  if (['mp4', 'mov', 'avi', 'mkv', 'wmv', 'flv'].includes(ext)) {
-    return { icon: 'ant-design:video-camera-filled', color: '#9c27b0' }
-  }
-  if (['mp3', 'wav', 'ogg', 'flac', 'aac'].includes(ext)) {
-    return { icon: 'ant-design:audio-filled', color: '#9c27b0' }
-  }
-  if (['txt', 'md', 'log', 'json', 'xml'].includes(ext)) {
-    return { icon: 'ant-design:file-text-filled', color: '#909399' }
-  }
-  return { icon: 'ant-design:file-filled', color: '#909399' }
-})
+/** 文件图标：按扩展名分配 icon + 颜色 */
+const fileIconInfo = computed(() => getFileIconInfo(filePayload.value?.name))
 
 /** 系统事件 / 未知类型 fallback：取 JSON 首层 content，否则原文 */
 const fallbackText = computed(() => {