From e00442647be30788518afc9a3017bb29b09d3965 Mon Sep 17 00:00:00 2001
From: Soulter <37870767+Soulter@users.noreply.github.com>
Date: Wed, 16 Sep 2026 15:40:49 +0800
Subject: [PATCH] feat: improve conversation data previews (#10108)

---
 .../ConversationHistoryPreview.vue            | 588 ++++++++++++++++++
 .../locales/en-US/features/conversation.json  |  19 +-
 .../locales/ja-JP/features/conversation.json  |  19 +-
 .../locales/ru-RU/features/conversation.json  |  19 +-
 .../locales/zh-CN/features/conversation.json  |  19 +-
 .../ConversationWorkspacePage.vue             | 110 +---
 6 files changed, 678 insertions(+), 96 deletions(-)
 create mode 100644 dashboard/src/components/conversation/ConversationHistoryPreview.vue

diff --git a/dashboard/src/components/conversation/ConversationHistoryPreview.vue b/dashboard/src/components/conversation/ConversationHistoryPreview.vue
new file mode 100644
index 000000000..11f660291
--- /dev/null
+++ b/dashboard/src/components/conversation/ConversationHistoryPreview.vue
@@ -0,0 +1,588 @@
+<script setup lang="ts">
+import { computed, ref, watch } from "vue";
+import { ChevronRight, Minus, Plus } from "@lucide/vue";
+import MarkdownIt from "markdown-it";
+import DOMPurify from "dompurify";
+import { useModuleI18n } from "@/i18n/composables";
+
+const props = defineProps<{ messages: unknown[] }>();
+const { tm } = useModuleI18n("features/conversation");
+const markdownEnabled = ref(true);
+const fontSize = ref(13);
+const settingsKey = "conversation.preview.reading";
+
+try {
+  const saved = JSON.parse(localStorage.getItem(settingsKey) || "null");
+  if (typeof saved?.markdown === "boolean")
+    markdownEnabled.value = saved.markdown;
+  if (
+    Number.isInteger(saved?.fontSize) &&
+    saved.fontSize >= 12 &&
+    saved.fontSize <= 18
+  ) {
+    fontSize.value = saved.fontSize;
+  }
+} catch {
+  // Reading preferences are optional when storage is unavailable or invalid.
+}
+
+watch([markdownEnabled, fontSize], () => {
+  try {
+    localStorage.setItem(
+      settingsKey,
+      JSON.stringify({
+        markdown: markdownEnabled.value,
+        fontSize: fontSize.value,
+      }),
+    );
+  } catch {
+    // Keep the current preferences usable when storage is unavailable.
+  }
+});
+
+const markdown = new MarkdownIt({ html: false, breaks: true, linkify: true });
+const knownRoles = [
+  "user",
+  "assistant",
+  "system",
+  "developer",
+  "tool",
+  "function",
+];
+type PreviewPart = {
+  kind: "text" | "image" | "data";
+  text: string;
+  html?: string;
+  label?: string;
+};
+
+const records = computed(() =>
+  props.messages
+    .filter(
+      (entry) =>
+        !entry ||
+        typeof entry !== "object" ||
+        !("role" in entry) ||
+        entry.role !== "_checkpoint",
+    )
+    .map((entry) => {
+      const message =
+        entry && typeof entry === "object" && !Array.isArray(entry)
+          ? (entry as Record<string, unknown>)
+          : { content: entry };
+      const role = typeof message.role === "string" ? message.role : "unknown";
+      const parts: PreviewPart[] = [];
+      const content = Array.isArray(message.content)
+        ? message.content
+        : [message.content];
+
+      // Preserve unsupported content as data instead of silently dropping it.
+      for (const item of content) {
+        if (item == null) continue;
+        if (
+          typeof item === "string" ||
+          (item?.type === "text" && typeof item.text === "string")
+        ) {
+          const text = typeof item === "string" ? item : item.text;
+          if (text.length) {
+            parts.push({
+              kind: "text",
+              text,
+              html: markdownEnabled.value
+                ? DOMPurify.sanitize(markdown.render(text), {
+                    USE_PROFILES: { html: true },
+                  })
+                : undefined,
+            });
+          }
+        } else if (
+          item?.type === "image_url" &&
+          typeof item.image_url?.url === "string" &&
+          /^(https?:\/\/|data:image\/(png|jpeg|jpg|gif|webp);base64,)/i.test(
+            item.image_url.url,
+          )
+        ) {
+          parts.push({ kind: "image", text: item.image_url.url });
+        } else {
+          parts.push({ kind: "data", text: JSON.stringify(item, null, 2) });
+        }
+      }
+
+      if (
+        typeof message.reasoning_content === "string" &&
+        message.reasoning_content
+      ) {
+        parts.push({
+          kind: "data",
+          label: tm("workspace.preview.reasoning"),
+          text: message.reasoning_content,
+        });
+      }
+
+      if (Array.isArray(message.tool_calls)) {
+        for (const call of message.tool_calls) {
+          let data = call;
+          const fn = call?.function;
+          if (fn && typeof fn.arguments === "string") {
+            try {
+              data = {
+                ...call,
+                function: { ...fn, arguments: JSON.parse(fn.arguments) },
+              };
+            } catch {
+              // Incomplete or non-JSON arguments remain visible exactly as recorded.
+            }
+          }
+          parts.push({
+            kind: "data",
+            label: `${tm("workspace.preview.toolCall")}${
+              typeof fn?.name === "string" ? ` · ${fn.name}` : ""
+            }`,
+            text: JSON.stringify(data, null, 2),
+          });
+        }
+      }
+
+      if (
+        !parts.length &&
+        !Object.prototype.hasOwnProperty.call(message, "content")
+      ) {
+        parts.push({ kind: "data", text: JSON.stringify(entry, null, 2) });
+      }
+
+      return {
+        role,
+        label: knownRoles.includes(role)
+          ? tm(`workspace.preview.roles.${role}`)
+          : role === "unknown"
+          ? tm("status.unknown")
+          : role,
+        name: typeof message.name === "string" ? message.name : "",
+        toolCallId:
+          typeof message.tool_call_id === "string" ? message.tool_call_id : "",
+        parts,
+      };
+    }),
+);
+</script>
+
+<template>
+  <div
+    class="history-preview"
+    :style="{ '--preview-font-size': `${fontSize}px` }"
+  >
+    <div class="reading-toolbar">
+      <span class="record-count">{{
+        tm("workspace.preview.messageCount", { count: records.length })
+      }}</span>
+      <div class="reading-controls">
+        <button
+          type="button"
+          class="markdown-toggle"
+          :class="{ 'markdown-toggle--active': markdownEnabled }"
+          :aria-pressed="markdownEnabled"
+          :aria-label="tm('workspace.preview.markdown')"
+          :title="tm('workspace.preview.markdown')"
+          @click="markdownEnabled = !markdownEnabled"
+        >
+          <span class="toggle-indicator" aria-hidden="true" />
+          Markdown
+        </button>
+        <div
+          class="font-controls"
+          role="group"
+          :aria-label="tm('workspace.preview.fontSize')"
+        >
+          <button
+            type="button"
+            :disabled="fontSize <= 12"
+            :aria-label="tm('workspace.preview.smallerText')"
+            :title="tm('workspace.preview.smallerText')"
+            @click="fontSize--"
+          >
+            <Minus :size="13" aria-hidden="true" />
+          </button>
+          <output
+            :aria-label="tm('workspace.preview.fontSize')"
+            aria-live="polite"
+            >{{ fontSize }}px</output
+          >
+          <button
+            type="button"
+            :disabled="fontSize >= 18"
+            :aria-label="tm('workspace.preview.largerText')"
+            :title="tm('workspace.preview.largerText')"
+            @click="fontSize++"
+          >
+            <Plus :size="13" aria-hidden="true" />
+          </button>
+        </div>
+      </div>
+    </div>
+
+    <div
+      class="history-records"
+      tabindex="0"
+      role="region"
+      :aria-label="tm('workspace.preview.title')"
+    >
+      <div v-if="!records.length" class="history-empty">
+        {{ tm("workspace.preview.empty") }}
+      </div>
+      <article
+        v-for="(record, index) in records"
+        :key="index"
+        class="history-record"
+        :class="{ 'history-record--user': record.role === 'user' }"
+      >
+        <header class="record-header">
+          <span class="record-index">{{
+            String(index + 1).padStart(2, "0")
+          }}</span>
+          <span
+            class="record-role"
+            :class="{ 'record-role--assistant': record.role === 'assistant' }"
+            >{{ record.label }}</span
+          >
+          <span v-if="record.name" class="record-name">{{ record.name }}</span>
+          <span
+            v-if="record.toolCallId"
+            class="record-call-id"
+            :title="record.toolCallId"
+            >{{ record.toolCallId }}</span
+          >
+        </header>
+        <div class="record-body">
+          <span v-if="!record.parts.length" class="empty-content">{{
+            tm("status.emptyContent")
+          }}</span>
+          <template v-for="(part, partIndex) in record.parts" :key="partIndex">
+            <div
+              v-if="part.kind === 'text' && markdownEnabled"
+              class="record-markdown"
+              v-html="part.html"
+            />
+            <pre v-else-if="part.kind === 'text'" class="record-text">{{
+              part.text
+            }}</pre>
+            <img
+              v-else-if="part.kind === 'image'"
+              class="record-image"
+              :src="part.text"
+              :alt="tm('workspace.preview.image')"
+              loading="lazy"
+              referrerpolicy="no-referrer"
+            />
+            <details v-else class="record-data">
+              <summary>
+                <ChevronRight :size="13" aria-hidden="true" />{{
+                  part.label || tm("workspace.preview.structuredData")
+                }}
+              </summary>
+              <pre>{{ part.text }}</pre>
+            </details>
+          </template>
+        </div>
+      </article>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.history-preview {
+  display: flex;
+  flex: 1;
+  flex-direction: column;
+  min-height: 0;
+  min-width: 0;
+  color: rgb(var(--v-theme-on-surface));
+}
+
+.reading-toolbar,
+.reading-controls,
+.font-controls,
+.markdown-toggle,
+.record-header {
+  display: flex;
+  align-items: center;
+}
+
+.reading-toolbar {
+  flex: 0 0 auto;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 8px 16px;
+  border-block: 1px solid rgba(var(--v-theme-on-surface), 0.07);
+  font-size: 11px;
+}
+
+.record-count,
+.record-index,
+.record-call-id,
+.empty-content,
+.history-empty {
+  color: rgba(var(--v-theme-on-surface), 0.5);
+}
+
+.reading-controls {
+  gap: 10px;
+}
+
+.markdown-toggle {
+  gap: 6px;
+  min-height: 30px;
+  padding: 0 7px;
+  border-radius: 6px;
+  color: rgba(var(--v-theme-on-surface), 0.6);
+}
+
+.markdown-toggle--active {
+  color: rgb(var(--v-theme-primary));
+}
+
+.toggle-indicator {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: currentColor;
+  opacity: 0.4;
+}
+
+.markdown-toggle--active .toggle-indicator {
+  opacity: 1;
+}
+
+.font-controls {
+  border: 1px solid rgba(var(--v-theme-on-surface), 0.12);
+  border-radius: 6px;
+  overflow: hidden;
+}
+
+.font-controls button {
+  display: grid;
+  place-items: center;
+  width: 28px;
+  height: 28px;
+}
+
+.font-controls button:disabled {
+  opacity: 0.3;
+  cursor: default;
+}
+.font-controls output {
+  min-width: 38px;
+  text-align: center;
+  font-variant-numeric: tabular-nums;
+}
+.reading-controls button:hover:not(:disabled) {
+  background: rgba(var(--v-theme-on-surface), 0.05);
+}
+.reading-controls button:focus-visible,
+.record-data summary:focus-visible {
+  outline: 2px solid rgb(var(--v-theme-primary));
+  outline-offset: -2px;
+}
+
+.history-records {
+  flex: 1;
+  min-height: 0;
+  overflow: auto;
+  overscroll-behavior: contain;
+  scrollbar-gutter: stable;
+}
+
+.history-empty {
+  padding: 48px 16px;
+  text-align: center;
+  font-size: 13px;
+}
+.history-record {
+  padding: 16px 18px;
+}
+.history-record--user {
+  background: rgba(var(--v-theme-on-surface), 0.055);
+}
+.history-record + .history-record {
+  border-top: 1px solid rgba(var(--v-theme-on-surface), 0.07);
+}
+.record-header {
+  gap: 8px;
+  margin-bottom: 9px;
+  font-size: 11px;
+  min-width: 0;
+}
+.record-index {
+  font-variant-numeric: tabular-nums;
+  font-size: 10px;
+}
+.record-role {
+  font-weight: 650;
+  flex-shrink: 0;
+}
+.record-role--assistant {
+  color: rgb(var(--v-theme-primary));
+}
+.record-name,
+.record-call-id {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.record-call-id {
+  margin-left: auto;
+  font-family: monospace;
+  font-size: 10px;
+}
+.record-body {
+  font-size: var(--preview-font-size);
+  line-height: 1.65;
+  overflow-wrap: anywhere;
+}
+.record-body > * + * {
+  margin-top: 10px;
+}
+.record-text {
+  white-space: pre-wrap;
+  font: inherit;
+  margin: 0;
+}
+.record-image,
+.record-markdown :deep(img) {
+  display: inline-block;
+  max-width: min(100%, 144px);
+  max-height: 104px;
+  margin: 4px 6px 4px 0;
+  object-fit: contain;
+  vertical-align: top;
+  border-radius: 6px;
+}
+
+.record-data {
+  border: 1px solid rgba(var(--v-theme-on-surface), 0.09);
+  border-radius: 7px;
+  overflow: hidden;
+}
+
+.record-data summary {
+  display: flex;
+  align-items: center;
+  gap: 5px;
+  padding: 7px 9px;
+  background: rgba(var(--v-theme-on-surface), 0.025);
+  cursor: pointer;
+  font-size: 0.92em;
+  list-style: none;
+}
+
+.record-data summary::-webkit-details-marker {
+  display: none;
+}
+.record-data summary svg {
+  flex-shrink: 0;
+  transition: transform 0.15s;
+}
+.record-data[open] summary svg {
+  transform: rotate(90deg);
+}
+.record-data pre {
+  margin: 0;
+  padding: 10px;
+  overflow: auto;
+  max-height: 360px;
+  white-space: pre-wrap;
+}
+.record-data pre,
+.record-markdown :deep(pre),
+.record-markdown :deep(code) {
+  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
+  font-size: 0.92em;
+}
+.record-markdown {
+  overflow: hidden;
+}
+.record-markdown :deep(p) {
+  margin: 0 0 0.7em;
+}
+.record-markdown :deep(> :last-child) {
+  margin-bottom: 0;
+}
+.record-markdown :deep(h1),
+.record-markdown :deep(h2),
+.record-markdown :deep(h3),
+.record-markdown :deep(h4),
+.record-markdown :deep(h5),
+.record-markdown :deep(h6) {
+  font-size: 1.08em;
+  font-weight: 650;
+  line-height: 1.5;
+  margin: 1em 0 0.5em;
+}
+.record-markdown :deep(> :first-child) {
+  margin-top: 0;
+}
+.record-markdown :deep(ul),
+.record-markdown :deep(ol) {
+  padding-left: 1.6em;
+  margin-bottom: 0.7em;
+}
+.record-markdown :deep(li + li) {
+  margin-top: 0.2em;
+}
+.record-markdown :deep(pre) {
+  overflow-x: auto;
+  padding: 10px 12px;
+  border-radius: 6px;
+  background: rgba(var(--v-theme-on-surface), 0.045);
+  margin-bottom: 0.7em;
+}
+.record-markdown :deep(code) {
+  padding: 0.1em 0.3em;
+  border-radius: 3px;
+  background: rgba(var(--v-theme-on-surface), 0.055);
+}
+.record-markdown :deep(pre code) {
+  padding: 0;
+  background: none;
+  font-size: inherit;
+}
+.record-markdown :deep(blockquote) {
+  margin: 0 0 0.7em;
+  padding: 2px 12px;
+  border-left: 3px solid rgba(var(--v-theme-on-surface), 0.18);
+  color: rgba(var(--v-theme-on-surface), 0.68);
+}
+.record-markdown :deep(table) {
+  display: block;
+  overflow-x: auto;
+  border-collapse: collapse;
+  margin-bottom: 0.7em;
+}
+.record-markdown :deep(th),
+.record-markdown :deep(td) {
+  padding: 5px 9px;
+  border: 1px solid rgba(var(--v-theme-on-surface), 0.12);
+}
+.record-markdown :deep(th) {
+  background: rgba(var(--v-theme-on-surface), 0.04);
+  font-weight: 600;
+}
+.record-markdown :deep(a) {
+  color: rgb(var(--v-theme-primary));
+  text-decoration: underline;
+}
+.record-markdown :deep(hr) {
+  border: 0;
+  border-top: 1px solid rgba(var(--v-theme-on-surface), 0.12);
+  margin: 1em 0;
+}
+
+@media (max-width: 600px) {
+  .history-record {
+    padding: 14px;
+  }
+  .reading-toolbar {
+    padding-inline: 12px;
+  }
+}
+</style>
diff --git a/dashboard/src/i18n/locales/en-US/features/conversation.json b/dashboard/src/i18n/locales/en-US/features/conversation.json
index ac6179bd0..49ec8547d 100644
--- a/dashboard/src/i18n/locales/en-US/features/conversation.json
+++ b/dashboard/src/i18n/locales/en-US/features/conversation.json
@@ -147,7 +147,24 @@
       "empty": "This conversation has no messages",
       "copyUmo": "Copy UMO",
       "rawData": "Raw data",
-      "copyRawData": "Copy raw data"
+      "copyRawData": "Copy raw data",
+      "messageCount": "{count} messages",
+      "markdown": "Render Markdown",
+      "fontSize": "Text size",
+      "smallerText": "Decrease text size",
+      "largerText": "Increase text size",
+      "structuredData": "Structured content",
+      "toolCall": "Tool call",
+      "reasoning": "Reasoning",
+      "image": "Message image",
+      "roles": {
+        "user": "User",
+        "assistant": "Assistant",
+        "system": "System",
+        "developer": "Developer",
+        "tool": "Tool result",
+        "function": "Function result"
+      }
     },
     "actions": {
       "editTitle": "Edit title",
diff --git a/dashboard/src/i18n/locales/ja-JP/features/conversation.json b/dashboard/src/i18n/locales/ja-JP/features/conversation.json
index b696e143f..9d4c88301 100644
--- a/dashboard/src/i18n/locales/ja-JP/features/conversation.json
+++ b/dashboard/src/i18n/locales/ja-JP/features/conversation.json
@@ -147,7 +147,24 @@
       "empty": "この会話にはまだメッセージがありません",
       "copyUmo": "UMO をコピー",
       "rawData": "生データ",
-      "copyRawData": "生データをコピー"
+      "copyRawData": "生データをコピー",
+      "messageCount": "{count} 件のメッセージ",
+      "markdown": "Markdown を表示",
+      "fontSize": "文字サイズ",
+      "smallerText": "文字を小さくする",
+      "largerText": "文字を大きくする",
+      "structuredData": "構造化コンテンツ",
+      "toolCall": "ツール呼び出し",
+      "reasoning": "思考過程",
+      "image": "メッセージ画像",
+      "roles": {
+        "user": "ユーザー",
+        "assistant": "アシスタント",
+        "system": "システム",
+        "developer": "開発者",
+        "tool": "ツール結果",
+        "function": "関数結果"
+      }
     },
     "actions": {
       "editTitle": "タイトルを編集",
diff --git a/dashboard/src/i18n/locales/ru-RU/features/conversation.json b/dashboard/src/i18n/locales/ru-RU/features/conversation.json
index 8afda742b..fcb47ae8f 100644
--- a/dashboard/src/i18n/locales/ru-RU/features/conversation.json
+++ b/dashboard/src/i18n/locales/ru-RU/features/conversation.json
@@ -147,7 +147,24 @@
       "empty": "В этом диалоге нет сообщений",
       "copyUmo": "Копировать UMO",
       "rawData": "Исходные данные",
-      "copyRawData": "Копировать исходные данные"
+      "copyRawData": "Копировать исходные данные",
+      "messageCount": "Сообщений: {count}",
+      "markdown": "Отображать Markdown",
+      "fontSize": "Размер текста",
+      "smallerText": "Уменьшить текст",
+      "largerText": "Увеличить текст",
+      "structuredData": "Структурированные данные",
+      "toolCall": "Вызов инструмента",
+      "reasoning": "Рассуждения",
+      "image": "Изображение в сообщении",
+      "roles": {
+        "user": "Пользователь",
+        "assistant": "Ассистент",
+        "system": "Система",
+        "developer": "Разработчик",
+        "tool": "Результат инструмента",
+        "function": "Результат функции"
+      }
     },
     "actions": {
       "editTitle": "Изменить заголовок",
diff --git a/dashboard/src/i18n/locales/zh-CN/features/conversation.json b/dashboard/src/i18n/locales/zh-CN/features/conversation.json
index ef7ae0d7b..404a16050 100644
--- a/dashboard/src/i18n/locales/zh-CN/features/conversation.json
+++ b/dashboard/src/i18n/locales/zh-CN/features/conversation.json
@@ -147,7 +147,24 @@
       "empty": "这个对话还没有消息",
       "copyUmo": "复制 UMO",
       "rawData": "原始数据",
-      "copyRawData": "复制原始数据"
+      "copyRawData": "复制原始数据",
+      "messageCount": "{count} 条消息",
+      "markdown": "渲染 Markdown",
+      "fontSize": "正文字号",
+      "smallerText": "缩小字号",
+      "largerText": "放大字号",
+      "structuredData": "结构化内容",
+      "toolCall": "工具调用",
+      "reasoning": "思考过程",
+      "image": "消息图片",
+      "roles": {
+        "user": "用户",
+        "assistant": "助手",
+        "system": "系统",
+        "developer": "开发者",
+        "tool": "工具结果",
+        "function": "函数结果"
+      }
     },
     "actions": {
       "editTitle": "编辑标题",
diff --git a/dashboard/src/views/conversation/ConversationWorkspacePage.vue b/dashboard/src/views/conversation/ConversationWorkspacePage.vue
index b8cc90d9c..130cd792b 100644
--- a/dashboard/src/views/conversation/ConversationWorkspacePage.vue
+++ b/dashboard/src/views/conversation/ConversationWorkspacePage.vue
@@ -27,7 +27,7 @@ import {
   X,
 } from "@lucide/vue";
 import { conversationApi } from "@/api/v1";
-import MessageList from "@/components/chat/MessageList.vue";
+import ConversationHistoryPreview from "@/components/conversation/ConversationHistoryPreview.vue";
 import { useI18n, useModuleI18n } from "@/i18n/composables";
 import { useCustomizerStore } from "@/stores/customizer";
 import { copyToClipboard } from "@/utils/clipboard";
@@ -113,11 +113,10 @@ const listRequestId = ref(0);
 
 const selectedByKey = ref<Record<string, Conversation>>({});
 const activeConversation = ref<Conversation | null>(null);
-const conversationHistory = ref<any[]>([]);
+const conversationHistory = ref<unknown[]>([]);
 const previewLoading = ref(false);
 const previewRequestId = ref(0);
 const previewPageScroll = ref(0);
-const previewMessagesRef = ref<HTMLElement | null>(null);
 const rawDataDialog = ref(false);
 const rawHistoryText = ref("");
 
@@ -220,65 +219,6 @@ const messageTypes = computed(() => [
   { label: tm("messageTypes.group"), value: "GroupMessage" },
 ]);
 
-const formattedMessages = computed(() => {
-  const toolResultsById: Record<string, unknown> = {};
-  for (const message of conversationHistory.value) {
-    if (message?.role === "tool" && message.tool_call_id) {
-      toolResultsById[message.tool_call_id] = message.content;
-    }
-  }
-
-  return conversationHistory.value
-    .filter(
-      (message) => message?.role === "user" || message?.role === "assistant",
-    )
-    .map((message) => {
-      const parts: any[] = [];
-      const content = message.content;
-      if (typeof content === "string" && content.trim()) {
-        parts.push({ type: "plain", text: content });
-      } else if (Array.isArray(content)) {
-        for (const item of content) {
-          if (item?.type === "text" && item.text) {
-            parts.push({ type: "plain", text: item.text });
-          } else if (item?.type === "image_url" && item.image_url?.url) {
-            parts.push({ type: "image", embedded_url: item.image_url.url });
-          }
-        }
-      } else if (content && typeof content === "object") {
-        const text = Object.values(content)
-          .filter((value) => typeof value === "string" && value.trim())
-          .join("\n");
-        if (text) parts.push({ type: "plain", text });
-      }
-
-      if (
-        message.role === "assistant" &&
-        Array.isArray(message.tool_calls) &&
-        message.tool_calls.length
-      ) {
-        parts.push({
-          type: "tool_call",
-          tool_calls: message.tool_calls.map((toolCall: any) => ({
-            id: toolCall.id,
-            name: toolCall.function?.name || toolCall.name,
-            args: toolCall.function?.arguments ?? toolCall.arguments,
-            result: toolResultsById[toolCall.id],
-            ts: 0,
-            finished_ts: 1,
-          })),
-        });
-      }
-
-      return {
-        content: {
-          type: message.role === "user" ? "user" : "bot",
-          message: parts.length ? parts : [{ type: "plain", text: "" }],
-        },
-      };
-    });
-});
-
 watch([keyword, umoQuery], () => {
   listAbortController.value?.abort();
   scheduleFetch();
@@ -543,9 +483,12 @@ async function openConversation(item: Conversation) {
     const detail = response.data.data || {};
     activeConversation.value = { ...item, ...detail };
     const history = detail.history || [];
-    conversationHistory.value = Array.isArray(history)
-      ? history
-      : JSON.parse(history || "[]");
+    const parsedHistory =
+      typeof history === "string" ? JSON.parse(history) : history;
+    if (!Array.isArray(parsedHistory)) {
+      throw new Error(tm("messages.historyError"));
+    }
+    conversationHistory.value = parsedHistory;
   } catch (error: any) {
     if (requestId !== previewRequestId.value) return;
     conversationHistory.value = [];
@@ -558,11 +501,6 @@ async function openConversation(item: Conversation) {
   } finally {
     if (requestId === previewRequestId.value) {
       previewLoading.value = false;
-      await nextTick();
-      if (requestId === previewRequestId.value && previewMessagesRef.value) {
-        previewMessagesRef.value.scrollTop =
-          previewMessagesRef.value.scrollHeight;
-      }
     }
   }
 }
@@ -1332,19 +1270,17 @@ function changePage(nextPage: number) {
           </v-btn>
         </div>
 
-        <div ref="previewMessagesRef" class="preview-messages">
-          <div v-if="previewLoading" class="panel-state">
+        <div v-if="previewLoading" class="preview-messages">
+          <div class="panel-state">
             <v-progress-circular indeterminate size="28" width="3" />
             <span>{{ tm("workspace.preview.loading") }}</span>
           </div>
-          <div
-            v-else-if="!formattedMessages.length"
-            class="panel-state panel-state--empty"
-          >
-            <span>{{ tm("workspace.preview.empty") }}</span>
-          </div>
-          <MessageList v-else :messages="formattedMessages" :is-dark="isDark" />
         </div>
+        <ConversationHistoryPreview
+          v-else
+          :key="conversationKey(activeConversation)"
+          :messages="conversationHistory"
+        />
       </section>
     </main>
 
@@ -1581,7 +1517,9 @@ function changePage(nextPage: number) {
   height: 28px;
   justify-content: center;
   padding: 0;
-  transition: background-color 0.16s ease, color 0.16s ease;
+  transition:
+    background-color 0.16s ease,
+    color 0.16s ease;
   width: 28px;
 }
 
@@ -2042,18 +1980,6 @@ function changePage(nextPage: number) {
   padding: 2px 6px 10px;
 }
 
-.preview-messages :deep(.messages-list) {
-  padding: 12px 8px 20px;
-}
-
-.preview-messages :deep(.message-row) {
-  margin-bottom: 14px;
-}
-
-.preview-messages :deep(.bot-avatar) {
-  display: none;
-}
-
 .raw-data-card {
   max-height: min(82dvh, 760px);
 }