diff --git a/src/components/JobResumeCustomDialog.vue b/src/components/JobResumeCustomDialog.vue
index a05babf..10913a9 100644
--- a/src/components/JobResumeCustomDialog.vue
+++ b/src/components/JobResumeCustomDialog.vue
@@ -268,10 +268,19 @@
                     >
                       <div class="job-resume-custom-dialog__ai-msg-bubble">{{ msg.content }}</div>
                     </div>
-                    <!-- 撤销修改气泡（仅 type=updated 的 assistant 消息显示） -->
-                    <div v-if="msg.canRollback" class="job-resume-custom-dialog__ai-rollback">
+                    <!-- 撤销修改气泡 -->
+                    <!-- 已撤销状态：所有历史中已撤销的消息都显示 -->
+                    <div v-if="msg.canRollback && msg.rollbackStatus === 'done'" class="job-resume-custom-dialog__ai-rollback">
+                      <span class="job-resume-custom-dialog__ai-rollback-done">
+                        <svg viewBox="0 0 16 16" fill="none" class="job-resume-custom-dialog__ai-rollback-icon">
+                          <path d="M3 8.5l3 3 7-7" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round"/>
+                        </svg>
+                        已撤销此次简历修改
+                      </span>
+                    </div>
+                    <!-- 撤销按钮：仅当该消息是列表最后一条且为AI修改简历的回答且未撤销时显示 -->
+                    <div v-if="msg.canRollback && msg.rollbackStatus !== 'done' && isLastMessage(i)" class="job-resume-custom-dialog__ai-rollback">
                       <button
-                        v-if="msg.rollbackStatus !== 'done'"
                         class="job-resume-custom-dialog__ai-rollback-btn"
                         @click="handleRollbackClick(i)"
                       >
@@ -280,12 +289,6 @@
                         </svg>
                         撤销修改
                       </button>
-                      <span v-else class="job-resume-custom-dialog__ai-rollback-done">
-                        <svg viewBox="0 0 16 16" fill="none" class="job-resume-custom-dialog__ai-rollback-icon">
-                          <path d="M3 8.5l3 3 7-7" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round"/>
-                        </svg>
-                        已撤销此次简历修改
-                      </span>
                     </div>
                   </div>
                   <!-- AI正在回复的加载指示器 -->
@@ -430,11 +433,37 @@ const isLowMatch = computed(() => props.jobInfo.matchScore < 6)
 
 /** 跳转到指定步骤 */
 function goToStep(step: number) {
+  // 从步骤4返回步骤3时，清理步骤4的状态数据（避免下次进入被旧数据影响）
+  if (currentStep.value === 4 && step === 3) {
+    resetStep4State()
+  }
   if (step === 3) initSkillOptions()
   if (step === 4) fetchAndLoadCustomResume()
   else currentStep.value = step
 }
 
+/** 重置步骤4（预览）的所有状态数据 */
+function resetStep4State() {
+  aiMessages.value = []
+  aiInputText.value = ''
+  aiLoading.value = false
+  isShowDiff.value = false
+  previewTab.value = 'ai'
+  cachedOptimizedScore.value = 0
+  oldResumeTemplateData.value = {
+    name: '', email: '', mobileNumber: '', wechatNumber: '', summary: '',
+    educations: [], workExperiences: [], internships: [], projects: [],
+    competitions: [], skills: [], certificates: [],
+  }
+  resumeTemplateData.value = {
+    name: '', email: '', mobileNumber: '', wechatNumber: '', summary: '',
+    educations: [], workExperiences: [], internships: [], projects: [],
+    competitions: [], skills: [], certificates: [],
+  }
+  customResumeRawData.value = { resume: {} }
+  showDownloadMenu.value = false
+}
+
 /** 抽屉模式下一步 */
 async function handleDrawerNext() {
   if (currentStep.value >= 4) return
@@ -914,6 +943,15 @@ const showRollbackConfirm = ref(false)
 /** 当前要撤销的消息索引 */
 const rollbackMsgIndex = ref(-1)
 
+/**
+ * 判断该消息是否为消息列表的最后一条
+ * 撤销按钮只在最后一条消息恰好是AI修改简历的回答时才显示
+ * @param msgIndex 消息在列表中的索引
+ */
+function isLastMessage(msgIndex: number): boolean {
+  return msgIndex === aiMessages.value.length - 1
+}
+
 /**
  * 点击撤销修改按钮 — 弹出确认弹窗
  * @param msgIndex 消息在列表中的索引
diff --git a/src/components/SideNav.vue b/src/components/SideNav.vue
index 18565a3..ec8c0ac 100644
--- a/src/components/SideNav.vue
+++ b/src/components/SideNav.vue
@@ -64,7 +64,10 @@
             <div class="side-nav__message-detail">
               <template v-if="currentMessage">
                 <div class="side-nav__message-detail-title">{{ currentMessage.title }}</div>
-                <div class="side-nav__message-detail-content">{{ currentMessage.content }}</div>
+                <div class="dflex aliite-e">
+                  <div class="side-nav__message-detail-content">{{ currentMessage.content }}</div>
+                  <div class="fs12 color-8 w200 tar">{{timestampToLocalDateTime(currentMessage.createTime, 'returnSecond')}}</div>
+                </div>
               </template>
               <div v-else class="side-nav__message-detail-empty">请选择一条消息查看</div>
             </div>
@@ -125,6 +128,7 @@ import { useStore } from 'vuex'
 import SettingsDialog from '@/components/SettingsDialog.vue'
 import { checkLogin } from '@/api/auth'
 import { fetchMessageList, fetchUnreadCount, markMessageRead } from '@/api/message'
+import { timestampToLocalDateTime } from '@/utils/time'
 import {userFeedback} from '@/api/setting'
 import type { MessageDto } from '@/api/message'
 import navJobsIcon from '@/assets/images/nav/nav-jobs-icon.png'