diff --git a/src/main/export-html-template.ts b/src/main/export-html-template.ts
index d489142..04af63a 100644
--- a/src/main/export-html-template.ts
+++ b/src/main/export-html-template.ts
@@ -329,6 +329,32 @@ body {
   color: var(--accent);
 }
 .timeline-month small { color: inherit; }
+.timeline-month-entry { display: grid; gap: 2px; }
+.timeline-days {
+  display: grid;
+  gap: 1px;
+  margin: 0 0 4px 11px;
+  padding-left: 8px;
+  border-left: 1px solid var(--border);
+}
+.timeline-days[hidden] { display: none; }
+.timeline-day {
+  width: 100%;
+  display: flex;
+  justify-content: space-between;
+  gap: 8px;
+  border: 0;
+  border-radius: 6px;
+  background: transparent;
+  color: var(--muted);
+  padding: 5px 7px;
+  cursor: pointer;
+  font: inherit;
+  font-size: 11px;
+  text-align: left;
+}
+.timeline-day:hover, .timeline-day.active { background: var(--accent-soft); color: var(--accent); }
+.timeline-day small { color: inherit; }
 .scroll { width: 100%; max-width: 100%; overflow: auto; min-width: 0; padding: 10px 8px 36px; }
 .lazy-hint {
   width: min(100%, 820px);
@@ -787,6 +813,23 @@ body {
   }
   .timeline-months { display: flex; gap: 6px; }
   .timeline-months[hidden] { display: none; }
+  .timeline-month-entry { display: grid; gap: 2px; }
+  .timeline-days {
+    display: flex;
+    gap: 4px;
+    margin: 0;
+    padding: 0;
+    border-left: 0;
+  }
+  .timeline-days[hidden] { display: none; }
+  .timeline-day {
+    width: auto;
+    flex: 0 0 auto;
+    border-bottom: 2px solid transparent;
+    padding: 5px 6px;
+    white-space: nowrap;
+  }
+  .timeline-day:hover, .timeline-day.active { border-bottom-color: var(--accent); }
   .timeline-month {
     flex: 0 0 auto;
     width: auto;
@@ -879,6 +922,9 @@ const renderExportScript = (name: string): string => `
   let scrollLoadSuppressed = false
   let activeMonthUpdatePending = false
   let expandedTimelineYear = ''
+  let expandedTimelineMonth = ''
+  let selectedTimelineMonth = ''
+  let selectedTimelineDate = ''
   const tabPositions = new Map()
   let lastScrollTop = 0
   let zoom = 1
@@ -941,6 +987,13 @@ const renderExportScript = (name: string): string => `
     const date = new Date(timestamp * 1000)
     return date.getFullYear() + '-' + pad(date.getMonth() + 1)
   }
+  const dateKey = (message) => {
+    const timestamp = Number(message.createTime || 0)
+    if (!timestamp) return 'unknown'
+    const date = new Date(timestamp * 1000)
+    if (Number.isNaN(date.getTime())) return 'unknown'
+    return date.getFullYear() + '-' + pad(date.getMonth() + 1) + '-' + pad(date.getDate())
+  }
   const kindOf = (message) => {
     const data = message.contentData || {}
     const shareType = String(data.typeVal || '')
@@ -1317,6 +1370,15 @@ const renderExportScript = (name: string): string => `
       if (months) months.hidden = !expanded
     })
   }
+  const setExpandedTimelineMonth = (month) => {
+    expandedTimelineMonth = month || ''
+    timeline.querySelectorAll('.timeline-month').forEach((button) => {
+      const expanded = button.dataset.month === expandedTimelineMonth
+      button.setAttribute('aria-expanded', String(expanded))
+      const days = button.nextElementSibling
+      if (days) days.hidden = !expanded
+    })
+  }
   const renderTimeline = () => {
     if (filtered.length === 0) {
       expandedTimelineYear = ''
@@ -1327,18 +1389,36 @@ const renderExportScript = (name: string): string => `
     for (const message of filtered) {
       const key = monthKey(message)
       if (key === 'unknown') continue
-      groups.set(key, (groups.get(key) || 0) + 1)
+      const date = dateKey(message)
+      const group = groups.get(key) || { total: 0, days: new Map() }
+      group.total += 1
+      if (date !== 'unknown') group.days.set(date, (group.days.get(date) || 0) + 1)
+      groups.set(key, group)
     }
     const yearGroups = new Map()
-    for (const [key, total] of groups) {
+    for (const [key, group] of groups) {
       const parts = key.split('-')
       if (!yearGroups.has(parts[0])) yearGroups.set(parts[0], [])
-      yearGroups.get(parts[0]).push({ key, month: Number(parts[1]), total })
+      yearGroups.get(parts[0]).push({
+        key,
+        month: Number(parts[1]),
+        total: group.total,
+        days: Array.from(group.days.entries())
+          .sort(([left], [right]) => left.localeCompare(right))
+          .map(([date, total]) => ({ date, day: Number(date.slice(-2)), total }))
+      })
     }
-    const years = Array.from(yearGroups.keys())
+    const years = Array.from(yearGroups.keys()).sort((left, right) => left.localeCompare(right))
     if (!years.includes(expandedTimelineYear)) {
       expandedTimelineYear = years[years.length - 1] || ''
     }
+    for (const entries of yearGroups.values()) {
+      entries.sort((left, right) => left.key.localeCompare(right.key))
+    }
+    const allMonthKeys = Array.from(groups.keys()).sort((left, right) => left.localeCompare(right))
+    if (!allMonthKeys.includes(expandedTimelineMonth)) {
+      expandedTimelineMonth = allMonthKeys[allMonthKeys.length - 1] || ''
+    }
     let html = ''
     for (const year of years) {
       const expanded = year === expandedTimelineYear
@@ -1348,10 +1428,18 @@ const renderExportScript = (name: string): string => `
         '" aria-expanded="' + String(expanded) + '" aria-controls="' + esc(monthsId) + '">' +
         esc(year) + ' 年</button>' +
         '<div class="timeline-months" id="' + esc(monthsId) + '"' + (expanded ? '' : ' hidden') + '>' +
-        yearGroups.get(year).map((entry) =>
-          '<button class="timeline-month" type="button" data-month="' + esc(entry.key) + '">' +
-          '<span>' + entry.month + ' 月</span><small>' + entry.total + '</small></button>'
-        ).join('') + '</div></section>'
+        yearGroups.get(year).map((entry) => {
+          const monthExpanded = entry.key === expandedTimelineMonth
+          return '<div class="timeline-month-entry">' +
+            '<button class="timeline-month" type="button" data-month="' + esc(entry.key) +
+            '" aria-expanded="' + String(monthExpanded) + '">' +
+            '<span>' + entry.month + ' 月</span><small>' + entry.total + '</small></button>' +
+            '<div class="timeline-days" data-days-for-month="' + esc(entry.key) + '"' +
+            (monthExpanded ? '' : ' hidden') + '>' + entry.days.map((day) =>
+              '<button class="timeline-day" type="button" data-date="' + esc(day.date) + '">' +
+              '<span>' + esc(day.date.slice(5)) + '</span><small>' + day.total + '</small></button>'
+            ).join('') + '</div></div>'
+        }).join('') + '</div></section>'
     }
     timeline.innerHTML = html || '<div class="timeline-empty">时间信息不可用</div>'
   }
@@ -1377,16 +1465,27 @@ const renderExportScript = (name: string): string => `
     const activeMessage = atBottom
       ? visible[visible.length - 1] || messages[messages.length - 1]
       : anchoredMessage || visible[0] || messages[0]
-    const key = activeMessage && activeMessage.dataset.month
+    const key = selectedTimelineMonth || (selectedTimelineDate
+      ? selectedTimelineDate.slice(0, 7)
+      : '') ||
+      (activeMessage && activeMessage.dataset.month)
+    const activeIndex = activeMessage ? Number(activeMessage.dataset.index) : -1
+    const activeDate =
+      selectedTimelineDate ||
+      (activeIndex >= 0 && filtered[activeIndex] ? dateKey(filtered[activeIndex]) : '')
     let activeButton
     timeline.querySelectorAll('.timeline-month').forEach((button) => {
       const active = button.dataset.month === key
       button.classList.toggle('active', active)
       if (active) activeButton = button
     })
+    timeline.querySelectorAll('.timeline-day').forEach((button) => {
+      button.classList.toggle('active', button.dataset.date === activeDate)
+    })
     if (!activeButton) return
     const activeYear = key.split('-')[0]
     if (activeYear !== expandedTimelineYear) setExpandedTimelineYear(activeYear)
+    if (key !== expandedTimelineMonth) setExpandedTimelineMonth(key)
     const timelineBounds = timeline.getBoundingClientRect()
     const buttonBounds = activeButton.getBoundingClientRect()
     if (buttonBounds.top < timelineBounds.top) {
@@ -1535,6 +1634,8 @@ const renderExportScript = (name: string): string => `
     )
   }
   const applyFilters = (restorePosition = false) => {
+    selectedTimelineMonth = ''
+    selectedTimelineDate = ''
     filtered = matchingMessages()
     renderTimeline()
     if (!restorePosition || !restoreTabPosition()) resetWindow(true)
@@ -1572,18 +1673,32 @@ const renderExportScript = (name: string): string => `
     target.classList.add('located')
     window.setTimeout(() => target.classList.remove('located'), 1600)
   }
-  const jumpToMonth = (key) => {
-    const index = filtered.findIndex((message) => monthKey(message) === key)
+  const selectTimelineMonth = (key) => {
+    if (!filtered.some((message) => monthKey(message) === key)) return
+    selectedTimelineMonth = key
+    selectedTimelineDate = ''
+    setExpandedTimelineYear(key.split('-')[0])
+    setExpandedTimelineMonth(key)
+    timeline.querySelectorAll('.timeline-month').forEach((button) => {
+      button.classList.toggle('active', button.dataset.month === key)
+    })
+  }
+  const jumpToDate = (key) => {
+    const index = filtered.findIndex((message) => dateKey(message) === key)
     if (index < 0) return
+    selectedTimelineMonth = ''
+    selectedTimelineDate = key
     windowStart = Math.max(0, index - Math.floor(PAGE_SIZE / 4))
     windowEnd = Math.min(filtered.length, windowStart + PAGE_SIZE)
     windowStart = Math.max(0, windowEnd - PAGE_SIZE)
     renderWindow()
     const target = list.querySelector('.message[data-index="' + index + '"]')
     setScrollTop(target ? Math.max(0, scrollTopForTarget(target, 24)) : 0)
-    setExpandedTimelineYear(key.split('-')[0])
-    timeline.querySelectorAll('.timeline-month').forEach((button) => {
-      button.classList.toggle('active', button.dataset.month === key)
+    const month = key.slice(0, 7)
+    setExpandedTimelineYear(month.slice(0, 4))
+    setExpandedTimelineMonth(month)
+    timeline.querySelectorAll('.timeline-day').forEach((button) => {
+      button.classList.toggle('active', button.dataset.date === key)
     })
   }
   const slideWindow = (direction) => {
@@ -1620,6 +1735,10 @@ const renderExportScript = (name: string): string => `
     const nearTop = currentTop < 180
     const nearBottom = list.scrollHeight - currentTop - list.clientHeight < 240
     lastScrollTop = currentTop
+    if (!scrollLoadSuppressed) {
+      selectedTimelineMonth = ''
+      selectedTimelineDate = ''
+    }
     scheduleActiveMonthUpdate()
     if (scrollLoadSuppressed) return
     if (movingUp && nearTop) scheduleWindowSlide(-1)
@@ -1676,7 +1795,12 @@ const renderExportScript = (name: string): string => `
       return
     }
     const button = event.target.closest('[data-month]')
-    if (button) jumpToMonth(button.dataset.month)
+    if (button) {
+      selectTimelineMonth(button.dataset.month)
+      return
+    }
+    const dayButton = event.target.closest('[data-date]')
+    if (dayButton) jumpToDate(dayButton.dataset.date)
   })
 
   const updateZoom = () => preview.style.setProperty('--zoom', zoom)
diff --git a/src/main/export-service.ts b/src/main/export-service.ts
index 7db4939..f339d29 100644
--- a/src/main/export-service.ts
+++ b/src/main/export-service.ts
@@ -25,11 +25,12 @@ import { mergeCachedSelfInfo, type CachedSelfInfo } from './services/bootstrap-c
 import type { VoiceRecognitionUseCase } from './voice-pipeline/voice-recognition-use-case'
 import { imageFileQuality } from '../shared/image-quality'
 import { resolveMemberName } from '../shared/member-names'
+import { filesystemSafeName } from '../shared/contact-name'
 
 const jobs = new Set<string>()
 const activeArchives = new Map<string, Archiver>()
-const safeFilePart = (value: string): string =>
-  value.replace(/[\\/:*?"<>|]/g, '_').trim() || '聊天档案'
+const safeFilePart = (value: string, fallback = '聊天档案'): string =>
+  filesystemSafeName(value, fallback)
 const copyWritableExportFile = async (source: string, destination: string): Promise<void> => {
   try {
     await fs.chmod(destination, 0o644)
@@ -643,6 +644,7 @@ const kindOf = (message: Message): ExportMessageKind => {
   return 'text'
 }
 const csv = (value: unknown): string => `"${String(value ?? '').replace(/"/g, '""')}"`
+const csvBom = '\uFEFF'
 
 function render(format: ExportRequest['format'], messages: Message[], name: string): string {
   if (format === 'html') return renderExportPage(name)
@@ -650,7 +652,7 @@ function render(format: ExportRequest['format'], messages: Message[], name: stri
     return JSON.stringify({ name, exportedAt: new Date().toISOString(), messages }, null, 2)
   if (format === 'markdown')
     return `# ${name}\n\n${messages.map((m) => `**${m.name || (m.isSender ? '我' : '联系人')}** · ${m.datetime}\n\n${m.content || `[${m.type}]`}${m.exportMediaUrl || m.voiceDataUrl || m.exportMediaError ? `\n\n媒体：${m.exportMediaUrl || m.voiceDataUrl || m.exportMediaError}` : ''}\n`).join('\n')}`
-  return [
+  return csvBom + [
     '时间,发送者,类型,内容,媒体路径,媒体状态',
     ...messages.map((m) =>
       [
@@ -664,7 +666,7 @@ function render(format: ExportRequest['format'], messages: Message[], name: stri
         .map(csv)
         .join(',')
     )
-  ].join('\n')
+  ].join('\r\n')
 }
 
 interface SingleExportOptions {
@@ -681,6 +683,8 @@ interface AllExportManifestEntry {
   type: ExportTarget['type']
   folder: string
   messageCount: number
+  status: 'completed' | 'failed'
+  error?: string
 }
 
 const writeAllExportManifest = async (
@@ -1086,7 +1090,10 @@ async function runSingleExport(
       }
       const voiceService =
         request.includeMedia && chat.getChatDb()
-          ? new VoiceService(chat.getChatDb()!.getWcdb4Client())
+          ? new VoiceService(
+              chat.getChatDb()!.getWcdb4Client(),
+              chat.getChatDb()!.getWcdb4Client().getAccountRoot()
+            )
           : null
       const voiceMessages = messages.filter((message) => kindOf(message) === 'voice')
       const voicePhase = request.includeVoiceTranscripts ? 'transcribing' : 'media'
@@ -1635,6 +1642,8 @@ async function runAllExport(
   let outputDir = ''
   const manifest: AllExportManifestEntry[] = []
   let totalMessages = 0
+  let failedCount = 0
+  const failureMessages: string[] = []
   try {
     const targets = [...(request.targets || [])].sort((left, right) =>
       left.type === right.type ? 0 : left.type === 'group' ? -1 : 1
@@ -1667,80 +1676,121 @@ async function runAllExport(
       const categoryName = target.type === 'group' ? '群聊' : '联系人'
       const categoryDir = join(outputDir, categoryName)
       const folderName = folderNames.get(target.userMd5) || safeFilePart(target.name)
-      await fs.mkdir(categoryDir, { recursive: true })
-      const conversationOutputRoot =
-        request.format === 'html' ? categoryDir : join(categoryDir, folderName)
-      const basePercent = Math.floor((targetIndex / targets.length) * 100)
-      send({
-        jobId: request.jobId,
-        phase: 'reading',
-        processed: 0,
-        percent: basePercent,
-        currentTargetIndex: targetIndex + 1,
-        currentTargetCount: targets.length,
-        currentTargetName: target.name,
-        currentTargetType: target.type
-      })
+      const folder = `${categoryName}/${folderName}`
+      let result: ExportResult
+      try {
+        await fs.mkdir(categoryDir, { recursive: true })
+        const conversationOutputRoot =
+          request.format === 'html' ? categoryDir : join(categoryDir, folderName)
+        const basePercent = Math.floor((targetIndex / targets.length) * 100)
+        send({
+          jobId: request.jobId,
+          phase: 'reading',
+          processed: 0,
+          percent: basePercent,
+          currentTargetIndex: targetIndex + 1,
+          currentTargetCount: targets.length,
+          currentTargetName: target.name,
+          currentTargetType: target.type
+        })
 
-      const result = await runSingleExport(
-        {
-          ...request,
-          targets: [target],
-          outputName: target.name,
-          zip: false
-        },
-        win,
-        voiceRecognition,
-        {
-          outputRoot: conversationOutputRoot,
-          outputFolderName: request.format === 'html' ? folderName : undefined,
-          manageJob: false,
-          selfInfo,
-          sendProgress: (childProgress) => {
-            const childPercent = Math.max(0, Math.min(100, childProgress.percent || 0))
-            const percent = Math.min(
-              99,
-              Math.floor(((targetIndex + childPercent / 100) / targets.length) * 100)
-            )
-            const phase = childProgress.phase === 'completed' ? 'writing' : childProgress.phase
-            const now = Date.now()
-            const progressKey = `${targetIndex}:${phase}:${percent}`
-            const terminal = phase === 'failed' || phase === 'cancelled'
-            if (!terminal && progressKey === lastProgressKey && now - lastProgressAt < 500) return
-            lastProgressKey = progressKey
-            lastProgressAt = now
-            send({
-              ...childProgress,
-              jobId: request.jobId,
-              phase,
-              percent,
-              outputPath: undefined,
-              currentTargetIndex: targetIndex + 1,
-              currentTargetCount: targets.length,
-              currentTargetName: target.name,
-              currentTargetType: target.type
-            })
+        result = await runSingleExport(
+          {
+            ...request,
+            targets: [target],
+            outputName: target.name,
+            zip: false
+          },
+          win,
+          voiceRecognition,
+          {
+            outputRoot: conversationOutputRoot,
+            outputFolderName: request.format === 'html' ? folderName : undefined,
+            manageJob: false,
+            selfInfo,
+            sendProgress: (childProgress) => {
+              const childPercent = Math.max(0, Math.min(100, childProgress.percent || 0))
+              const percent = Math.min(
+                99,
+                Math.floor(((targetIndex + childPercent / 100) / targets.length) * 100)
+              )
+              const phase = childProgress.phase === 'completed' ? 'writing' : childProgress.phase
+              const now = Date.now()
+              const progressKey = `${targetIndex}:${phase}:${percent}`
+              const terminal = phase === 'failed' || phase === 'cancelled'
+              if (!terminal && progressKey === lastProgressKey && now - lastProgressAt < 500) return
+              lastProgressKey = progressKey
+              lastProgressAt = now
+              send({
+                ...childProgress,
+                jobId: request.jobId,
+                phase,
+                percent,
+                outputPath: undefined,
+                currentTargetIndex: targetIndex + 1,
+                currentTargetCount: targets.length,
+                currentTargetName: target.name,
+                currentTargetType: target.type
+              })
+            }
           }
-        }
-      )
-      if (!result.success) {
-        if (result.error === '已取消') throw new Error('已取消')
-        throw new Error(`${target.name}：${result.error || '导出失败'}`)
+        )
+      } catch (error) {
+        const message = error instanceof Error ? error.message : String(error)
+        if (message === '已取消' || !jobs.has(request.jobId)) throw new Error('已取消')
+        result = { success: false, error: message }
       }
 
-      const messageCount = result.messageCount || 0
-      totalMessages += messageCount
-      manifest.push({
-        id: target.userMd5,
-        name: target.name,
-        type: target.type,
-        folder: `${categoryName}/${folderName}`,
-        messageCount
-      })
+      if (!result.success) {
+        if (result.error === '已取消' || !jobs.has(request.jobId)) throw new Error('已取消')
+        const error = `${target.name}：${result.error || '导出失败'}`
+        failedCount += 1
+        failureMessages.push(error)
+        manifest.push({
+          id: target.userMd5,
+          name: target.name,
+          type: target.type,
+          folder,
+          messageCount: 0,
+          status: 'failed',
+          error: result.error || '导出失败'
+        })
+        const failedPercent = Math.min(
+          99,
+          Math.floor(((targetIndex + 1) / targets.length) * 100)
+        )
+        send({
+          jobId: request.jobId,
+          phase: 'failed',
+          processed: totalMessages,
+          total: totalMessages,
+          percent: failedPercent,
+          error,
+          currentTargetIndex: targetIndex + 1,
+          currentTargetCount: targets.length,
+          currentTargetName: target.name,
+          currentTargetType: target.type
+        })
+      } else {
+        const messageCount = result.messageCount || 0
+        totalMessages += messageCount
+        manifest.push({
+          id: target.userMd5,
+          name: target.name,
+          type: target.type,
+          folder,
+          messageCount,
+          status: 'completed'
+        })
+      }
       await writeAllExportManifest(outputDir, manifest, totalMessages, 'running')
     }
 
-    await writeAllExportManifest(outputDir, manifest, totalMessages, 'completed')
+    const finalStatus = failedCount ? 'failed' : 'completed'
+    const finalError = failedCount
+      ? `全部导出完成：成功 ${targets.length - failedCount} 个，失败 ${failedCount} 个。${failureMessages.join('；')}`
+      : undefined
+    await writeAllExportManifest(outputDir, manifest, totalMessages, finalStatus, finalError)
 
     let completedPath = outputDir
     if (request.zip) {
@@ -1759,17 +1809,23 @@ async function runAllExport(
 
     send({
       jobId: request.jobId,
-      phase: 'completed',
+      phase: failedCount ? 'failed' : 'completed',
       processed: totalMessages,
       total: totalMessages,
       percent: 100,
+      error: finalError,
       outputPath: completedPath,
       currentTargetIndex: targets.length,
       currentTargetCount: targets.length,
       currentTargetName: targets.at(-1)?.name,
       currentTargetType: targets.at(-1)?.type
     })
-    return { success: true, outputPath: completedPath, messageCount: totalMessages }
+    return {
+      success: failedCount === 0,
+      outputPath: completedPath,
+      messageCount: totalMessages,
+      ...(finalError ? { error: finalError } : {})
+    }
   } catch (error) {
     const message = error instanceof Error ? error.message : String(error)
     const cancelled = !jobs.has(request.jobId) || message === '已取消'
diff --git a/src/main/index.ts b/src/main/index.ts
index 0bdbe04..ae458e0 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -818,7 +818,7 @@ app.whenReady().then(async () => {
         const wcdb4Client = nextWechatDb.getWcdb4Client()
         const sessions = await wcdb4Client.getSessionsAsync({ hydrateDisplayNames: false })
         configureRecallProtection(wcdb4Client, resolvedRoot, settings.recallProtectionEnabled)
-        voiceService = new VoiceService(wcdb4Client)
+        voiceService = new VoiceService(wcdb4Client, resolvedRoot)
         voiceRecognition?.connect(voiceService, resolvedRoot)
         stickerService = new StickerService(wcdb4Client)
         videoAssetService = new VideoAssetService(wcdb4Client)
@@ -1958,7 +1958,7 @@ app.whenReady().then(async () => {
     if (!ok) return { success: false, error: '数据库未初始化或重新打开失败' }
     const client = chat.getChatDb()?.getWcdb4Client()
     if (client) {
-      voiceService = new VoiceService(client)
+      voiceService = new VoiceService(client, client.getAccountRoot())
       voiceRecognition?.connect(voiceService, client.getAccountRoot())
       const monitoring = await client.startMonitor((type, json) => {
         client.invalidateSessionCache()
diff --git a/src/main/voice-service.ts b/src/main/voice-service.ts
index 36210a3..32ba639 100644
--- a/src/main/voice-service.ts
+++ b/src/main/voice-service.ts
@@ -4,6 +4,7 @@ import {
   createDefaultAudioDecoderRegistry,
   type EncodedVoiceSource
 } from './voice-pipeline/audio-decoder'
+import { voiceAccountIdentity, voiceMessageIdentity } from './voice-pipeline/voice-message-identity'
 
 export {
   findSilkWasmRuntimeLocation,
@@ -36,12 +37,16 @@ export interface VoiceReference {
 
 export class VoiceService {
   private wcdb4Client: Wcdb4Client
+  private readonly accountIdentity: string
   private voiceCache = new Map<string, string>()
   private pcmCache = new Map<string, ResolvedPcmAudio>()
   private readonly decoderRegistry = createDefaultAudioDecoderRegistry()
 
-  constructor(wcdb4Client: Wcdb4Client) {
+  constructor(wcdb4Client: Wcdb4Client, accountRoot?: string) {
     this.wcdb4Client = wcdb4Client
+    const clientWithRoot = wcdb4Client as unknown as { getAccountRoot?: () => string }
+    const resolvedRoot = accountRoot || clientWithRoot.getAccountRoot?.() || 'unbound-account'
+    this.accountIdentity = voiceAccountIdentity(resolvedRoot)
   }
 
   async resolveVoice(
@@ -50,7 +55,8 @@ export class VoiceService {
     createTime: number,
     svrId?: string | number
   ): Promise<{ success: boolean; data?: string; error?: string }> {
-    const cacheKey = this.buildCacheKey(sessionId, localId, createTime)
+    const reference = { sessionId, localId, createTime, svrId }
+    const cacheKey = this.buildCacheKey(reference)
 
     const cached = this.voiceCache.get(cacheKey)
     if (cached) {
@@ -89,7 +95,7 @@ export class VoiceService {
     const missing: Array<{ index: number; reference: VoiceReference }> = []
     references.forEach((reference, index) => {
       const cached = this.voiceCache.get(
-        this.buildCacheKey(reference.sessionId, reference.localId, reference.createTime)
+        this.buildCacheKey(reference)
       )
       if (cached) results[index] = { success: true, data: cached }
       else missing.push({ index, reference })
@@ -131,11 +137,7 @@ export class VoiceService {
           decoded.channels
         )
         const data = wavData.toString('base64')
-        const cacheKey = this.buildCacheKey(
-          reference.sessionId,
-          reference.localId,
-          reference.createTime
-        )
+        const cacheKey = this.buildCacheKey(reference)
         this.voiceCache.set(cacheKey, data)
         this.pcmCache.set(cacheKey, { ...decoded, codec: 'silk' })
         results[index] = { success: true, data }
@@ -168,7 +170,7 @@ export class VoiceService {
     createTime: number,
     svrId?: string | number
   ): Promise<ResolvePcmResult> {
-    const cacheKey = this.buildCacheKey(sessionId, localId, createTime)
+    const cacheKey = this.buildCacheKey({ sessionId, localId, createTime, svrId })
     const cached = this.pcmCache.get(cacheKey)
     if (cached) return { success: true, audio: cached }
 
@@ -217,8 +219,8 @@ export class VoiceService {
     }
   }
 
-  private buildCacheKey(sessionId: string, localId: number, createTime: number): string {
-    return `${sessionId}-${localId}-${createTime}`
+  private buildCacheKey(reference: VoiceReference): string {
+    return `voice-cache-v2:${this.accountIdentity}:${voiceMessageIdentity(reference)}`
   }
 
   private buildCandidates(sessionId: string): string[] {
diff --git a/src/renderer/src/components/conversation/ConversationItem.tsx b/src/renderer/src/components/conversation/ConversationItem.tsx
index 68c37bf..adefbdf 100644
--- a/src/renderer/src/components/conversation/ConversationItem.tsx
+++ b/src/renderer/src/components/conversation/ConversationItem.tsx
@@ -1,5 +1,6 @@
 import React, { useState } from 'react'
 import { Contact } from '../../../../shared/types'
+import { displayContactName } from '../../../../shared/contact-name'
 
 interface ConversationItemProps {
   contact: Contact
@@ -12,10 +13,9 @@ export function ConversationItem({
   active,
   onSelect
 }: ConversationItemProps): React.ReactElement {
-  const nickname = contact.m_nsNickName?.trim()
   const avatarUsername = contact.m_nsUsrName
   const internalWxid = contact.wxid || avatarUsername
-  const displayName = nickname || internalWxid || '未命名会话'
+  const displayName = displayContactName(contact, '未命名会话')
   const initial = (displayName || internalWxid || '?').charAt(0)
   const [repairedAvatar, setRepairedAvatar] = useState<{
     username: string
diff --git a/src/renderer/src/components/export/exportUtils.ts b/src/renderer/src/components/export/exportUtils.ts
index 381d012..93f551e 100644
--- a/src/renderer/src/components/export/exportUtils.ts
+++ b/src/renderer/src/components/export/exportUtils.ts
@@ -1,6 +1,7 @@
 import type { Contact, Message } from '../../../../shared/types'
 import type { ExportFormat, GroupMemberName } from './exportTypes'
 import { resolveMemberName } from '../../../../shared/member-names'
+import { displayContactName } from '../../../../shared/contact-name'
 
 export const messageKinds = [
   ['text', '文字'],
@@ -24,7 +25,7 @@ export const formatLabels: Record<ExportFormat, { label: string; hint?: string }
 export const formatOrder: ExportFormat[] = ['csv', 'html', 'json', 'markdown']
 
 export function displayName(contact: Contact | null): string {
-  return contact?.m_nsNickName || contact?.m_nsUsrName || '未选择会话'
+  return displayContactName(contact, '未选择会话')
 }
 
 export function formatPreviewTime(message: Message): string {
diff --git a/src/renderer/src/components/reports/ScheduledReportsWorkspace.tsx b/src/renderer/src/components/reports/ScheduledReportsWorkspace.tsx
index 3e1e9ef..401910b 100644
--- a/src/renderer/src/components/reports/ScheduledReportsWorkspace.tsx
+++ b/src/renderer/src/components/reports/ScheduledReportsWorkspace.tsx
@@ -598,6 +598,8 @@ export function ScheduledReportsWorkspace({
   const [editingTask, setEditingTask] = React.useState<ScheduledReportTask | null>(null)
   const [saving, setSaving] = React.useState(false)
   const [deletingTask, setDeletingTask] = React.useState<ScheduledReportTask | null>(null)
+  const [retryingExecution, setRetryingExecution] =
+    React.useState<ScheduledReportExecution | null>(null)
   const [busyTaskId, setBusyTaskId] = React.useState<string | null>(null)
 
   const load = React.useCallback(async (): Promise<void> => {
@@ -784,6 +786,13 @@ export function ScheduledReportsWorkspace({
     }
   }
 
+  const confirmRetrySend = async (): Promise<void> => {
+    if (!retryingExecution || busyTaskId) return
+    const execution = retryingExecution
+    setRetryingExecution(null)
+    await retrySend(execution)
+  }
+
   const testErrorNotification = async (task: ScheduledReportTask): Promise<void> => {
     setBusyTaskId(task.id)
     try {
@@ -1090,7 +1099,7 @@ export function ScheduledReportsWorkspace({
                           size="sm"
                           variant="outline"
                           disabled={busy}
-                          onClick={() => void retrySend(execution)}
+                          onClick={() => setRetryingExecution(execution)}
                         >
                           {busy ? '发送中…' : '重新发送'}
                         </Button>
@@ -1177,6 +1186,44 @@ export function ScheduledReportsWorkspace({
           </AlertDialogFooter>
         </AlertDialogContent>
       </AlertDialog>
+      <AlertDialog
+        open={Boolean(retryingExecution)}
+        onOpenChange={(open) => !open && setRetryingExecution(null)}
+      >
+        <AlertDialogContent>
+          <AlertDialogHeader>
+            <AlertDialogTitle>将重新发送这份日报？</AlertDialogTitle>
+            <AlertDialogDescription asChild>
+              <div className="grid gap-1">
+                <span>
+                  目标：
+                  {retryingExecution?.sendTarget ||
+                    tasks.find((item) => item.id === retryingExecution?.taskId)?.target ||
+                    tasks.find((item) => item.id === retryingExecution?.taskId)?.group ||
+                    '未指定'}
+                </span>
+                <span>
+                  日报：
+                  {tasks.find((item) => item.id === retryingExecution?.taskId)?.name || '定时日报'}
+                </span>
+                <span>日期：{formatDateTime(retryingExecution?.startedAt)}</span>
+              </div>
+            </AlertDialogDescription>
+          </AlertDialogHeader>
+          <AlertDialogFooter>
+            <AlertDialogCancel disabled={Boolean(busyTaskId)}>取消</AlertDialogCancel>
+            <AlertDialogAction
+              onClick={(event) => {
+                event.preventDefault()
+                void confirmRetrySend()
+              }}
+              disabled={Boolean(busyTaskId)}
+            >
+              {busyTaskId ? '发送中…' : '确认重新发送'}
+            </AlertDialogAction>
+          </AlertDialogFooter>
+        </AlertDialogContent>
+      </AlertDialog>
     </div>
   )
 }
diff --git a/src/renderer/src/components/reports/types.ts b/src/renderer/src/components/reports/types.ts
index 895285b..5b4d0d8 100644
--- a/src/renderer/src/components/reports/types.ts
+++ b/src/renderer/src/components/reports/types.ts
@@ -1,4 +1,5 @@
 import { Contact } from '../../../../shared/types'
+import { displayContactName } from '../../../../shared/contact-name'
 export type {
   GeneratedReportRecord,
   ReportAssetStatus,
@@ -12,4 +13,4 @@ export type {
 export type ReportWorkspaceView = 'configure' | 'result'
 
 export const contactDisplayName = (contact: Contact | null): string =>
-  contact?.m_nsNickName?.trim() || contact?.m_nsUsrName || '未命名群聊'
+  displayContactName(contact, '未命名群聊')
diff --git a/src/renderer/src/components/search/AISearchWorkspace.tsx b/src/renderer/src/components/search/AISearchWorkspace.tsx
index b656029..5da93fe 100644
--- a/src/renderer/src/components/search/AISearchWorkspace.tsx
+++ b/src/renderer/src/components/search/AISearchWorkspace.tsx
@@ -1000,37 +1000,43 @@ export function AISearchWorkspace({
       <div className="ai-search-insufficient-icon">!</div>
       <span className="ai-search-kicker">检索反馈</span>
       <h2>{analysisError || '当前范围没有足够证据'}</h2>
-      <p>可以扩大时间范围、切换群聊，或换一个更具体的问题。</p>
-      <Button
-        size="sm"
-        className="mt-5"
-        onClick={() => {
-          const expandToAll = range === '30d' || range === 'all'
-          setRange(expandToAll ? 'all' : '30d')
-          setTimeRangeOverride(
-            expandToAll
-              ? {
-                  label: '全部历史',
-                  reason: '用户主动扩大到全部历史',
-                  source: 'user_retry'
-                }
-              : undefined
-          )
-          skipNextCache()
-          void runAnalysis(undefined, {
-            range: expandToAll ? 'all' : '30d',
-            timeRangeOverride: expandToAll
-              ? {
-                  label: '全部历史',
-                  reason: '用户主动扩大到全部历史',
-                  source: 'user_retry'
-                }
-              : undefined
-          })
-        }}
-      >
-        {range === '30d' || range === 'all' ? '搜索全部历史' : '扩大到近 30 天'}
-      </Button>
+      {queryAgentEnabled ? (
+        <p>可以切换聊天范围，或换一个更具体的问题。</p>
+      ) : (
+        <>
+          <p>可以扩大时间范围、切换群聊，或换一个更具体的问题。</p>
+          <Button
+            size="sm"
+            className="mt-5"
+            onClick={() => {
+              const expandToAll = range === '30d' || range === 'all'
+              setRange(expandToAll ? 'all' : '30d')
+              setTimeRangeOverride(
+                expandToAll
+                  ? {
+                      label: '全部历史',
+                      reason: '用户主动扩大到全部历史',
+                      source: 'user_retry'
+                    }
+                  : undefined
+              )
+              skipNextCache()
+              void runAnalysis(undefined, {
+                range: expandToAll ? 'all' : '30d',
+                timeRangeOverride: expandToAll
+                  ? {
+                      label: '全部历史',
+                      reason: '用户主动扩大到全部历史',
+                      source: 'user_retry'
+                    }
+                  : undefined
+              })
+            }}
+          >
+            {range === '30d' || range === 'all' ? '搜索全部历史' : '扩大到近 30 天'}
+          </Button>
+        </>
+      )}
     </div>
   )
 
@@ -1400,7 +1406,7 @@ export function AISearchWorkspace({
           <AISearchComposer
             query={query}
             sourceLabel={sourceLabel}
-            rangeLabel={RANGE_LABELS[range]}
+            rangeLabel={queryAgentEnabled ? '时间由问题决定' : RANGE_LABELS[range]}
             history={history}
             historyOpen={historyOpen}
             loading={stage === 'loading'}
diff --git a/src/renderer/src/components/search/searchFormatters.ts b/src/renderer/src/components/search/searchFormatters.ts
index 4c3d079..0c29b16 100644
--- a/src/renderer/src/components/search/searchFormatters.ts
+++ b/src/renderer/src/components/search/searchFormatters.ts
@@ -1,6 +1,7 @@
 import type { KnowledgeRuntimeStatus } from '../../../../shared/knowledge'
 import { isKnowledgeFresh } from '../../../../shared/knowledge'
 import type { Contact } from '../../../../shared/types'
+import { displayContactName } from '../../../../shared/contact-name'
 import type { SearchTrace } from './searchTypes'
 
 export const formatBytes = (bytes: number): string => {
@@ -83,11 +84,7 @@ export const formatKnowledgeProcessed = (status: KnowledgeRuntimeStatus): string
 }
 
 export const contactLabel = (contact: Contact | null | undefined): string =>
-  contact?.m_nsNickName ||
-  contact?.remark ||
-  contact?.wechatNickname ||
-  contact?.m_nsUsrName ||
-  '未选择会话'
+  displayContactName(contact, '未选择会话')
 
 export const formatSearchTraceOverview = (
   trace: SearchTrace
diff --git a/src/renderer/src/features/settings/pages/VoiceRecognitionPage.tsx b/src/renderer/src/features/settings/pages/VoiceRecognitionPage.tsx
index 3f926e3..0d7fb79 100644
--- a/src/renderer/src/features/settings/pages/VoiceRecognitionPage.tsx
+++ b/src/renderer/src/features/settings/pages/VoiceRecognitionPage.tsx
@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useMemo, useState } from 'react'
 import type { Contact } from '../../../../../shared/types'
+import { displayContactName } from '../../../../../shared/contact-name'
 import type {
   VoiceBatchConversationSummary,
   VoiceBatchProgress,
@@ -68,7 +69,7 @@ const hasBatchApi = (): boolean =>
 const BATCH_PAGE_SIZE = 12
 
 function contactName(contact: Contact): string {
-  return contact.m_nsNickName || contact.remark || contact.wechatNickname || contact.m_nsUsrName
+  return displayContactName(contact)
 }
 
 export function VoiceRecognitionPage({
@@ -640,7 +641,7 @@ export function VoiceRecognitionPage({
                     {' · '}剩余 {formatTaskDuration(batchProgress.estimatedRemainingMs)}
                   </small>
                   {currentBatchConversation && (
-                    <small>当前会话：{currentBatchConversation.m_nsNickName}</small>
+                    <small>当前会话：{contactName(currentBatchConversation)}</small>
                   )}
                 </div>
                 <progress value={batchProgress.processed} max={Math.max(1, batchProgress.total)} />
diff --git a/src/shared/contact-name.ts b/src/shared/contact-name.ts
new file mode 100644
index 0000000..e164d90
--- /dev/null
+++ b/src/shared/contact-name.ts
@@ -0,0 +1,64 @@
+import type { Contact } from './types'
+
+type ContactNameSource = Partial<Pick<
+  Contact,
+  | 'm_nsNickName'
+  | 'm_nsUsrName'
+  | 'remark'
+  | 'alias'
+  | 'wechatNickname'
+  | 'wechatId'
+  | 'wxid'
+>>
+
+const nonRenderingCharacters = /[\p{Cc}\p{Cf}\p{Co}\p{Cs}]/gu
+const trailingPathCharacters = /[. ]+$/u
+const reservedDeviceName = /^(con|prn|aux|nul|com[0-9]|lpt[0-9])(?:\..*)?$/iu
+
+/** Remove characters that can make a name invisible while preserving normal emoji and CJK text. */
+export function visibleNamePart(value: unknown): string {
+  return String(value ?? '')
+    .replace(nonRenderingCharacters, '')
+    .replace(/[\r\n\t]+/gu, ' ')
+    .replace(/ {2,}/gu, ' ')
+    .trim()
+}
+
+export function isVisibleName(value: unknown): boolean {
+  return visibleNamePart(value).length > 0
+}
+
+/** Resolve a contact label without ever exposing an all-invisible raw nickname. */
+export function displayContactName(
+  contact: ContactNameSource | null | undefined,
+  fallback = '未命名联系人'
+): string {
+  const candidates = [
+    contact?.m_nsNickName,
+    contact?.remark,
+    contact?.alias,
+    contact?.wechatNickname,
+    contact?.wechatId,
+    contact?.wxid,
+    contact?.m_nsUsrName
+  ]
+  for (const candidate of candidates) {
+    const visible = visibleNamePart(candidate)
+    if (visible) return visible
+  }
+  return fallback
+}
+
+/** Make a human-readable label safe for a file or directory name. */
+export function filesystemSafeName(value: unknown, fallback = '未命名联系人'): string {
+  const visible = visibleNamePart(value)
+  const replaced = visible
+    .replace(/[\\/:*?"<>|]/gu, '_')
+    .replace(/[\r\n\t]+/gu, ' ')
+    .replace(/ {2,}/gu, ' ')
+    .replace(trailingPathCharacters, '')
+    .trim()
+  const candidate = replaced || visibleNamePart(fallback) || '未命名联系人'
+  if (reservedDeviceName.test(candidate)) return `${candidate}_`
+  return Array.from(candidate).slice(0, 80).join('') || '未命名联系人'
+}
diff --git a/src/shared/member-names.ts b/src/shared/member-names.ts
index e7ede4d..36cd95a 100644
--- a/src/shared/member-names.ts
+++ b/src/shared/member-names.ts
@@ -1,3 +1,5 @@
+import { visibleNamePart } from './contact-name'
+
 export type MemberNameMode = 'groupNickname' | 'wechatNickname' | 'remark'
 
 export interface MemberNameFields {
@@ -9,7 +11,7 @@ export interface MemberNameFields {
 }
 
 const firstName = (...values: Array<string | undefined>): string =>
-  values.map((value) => String(value || '').trim()).find(Boolean) || ''
+  values.map((value) => visibleNamePart(value)).find(Boolean) || ''
 
 export function resolveMemberName(member: MemberNameFields, mode: MemberNameMode): string {
   if (mode === 'groupNickname') {
diff --git a/tests/component/ai-search-query-agent.test.tsx b/tests/component/ai-search-query-agent.test.tsx
index 40ab4e9..2d7dc46 100644
--- a/tests/component/ai-search-query-agent.test.tsx
+++ b/tests/component/ai-search-query-agent.test.tsx
@@ -222,6 +222,8 @@ describe('AISearchWorkspace — 搜索范围 / 时间 UI / 真实统计与证据
     // 时间范围控件在 Query Agent 主路径下移除
     expect(screen.queryByText('时间范围')).toBeNull()
     expect(screen.queryByText('不限时间')).toBeNull()
+    expect(screen.queryByText('近 30 天')).toBeNull()
+    expect(screen.getByText('时间由问题决定')).toBeTruthy()
   })
 
   it('Query Agent 关闭时恢复 Legacy 的时间范围控件', async () => {
diff --git a/tests/component/scheduled-reports-workspace.test.tsx b/tests/component/scheduled-reports-workspace.test.tsx
index c808860..8a35db9 100644
--- a/tests/component/scheduled-reports-workspace.test.tsx
+++ b/tests/component/scheduled-reports-workspace.test.tsx
@@ -58,6 +58,10 @@ describe('ScheduledReportsWorkspace', () => {
         deleteScheduledReport: vi.fn(async () => ({ success: true, data: { deletedId: task.id } })),
         setScheduledReportEnabled: vi.fn(async () => ({ success: true, data: task })),
         runScheduledReportNow: vi.fn(async () => ({ success: true, data: { status: 'success' } })),
+        retryScheduledReportSend: vi.fn(async () => ({
+          success: true,
+          data: { status: 'success' }
+        })),
         testScheduledReportErrorNotification: vi.fn(async () => ({
           success: true,
           data: { status: 'failed', notificationStatus: 'sent' }
@@ -214,4 +218,42 @@ describe('ScheduledReportsWorkspace', () => {
       'success'
     )
   })
+
+  it('confirms a manual resend and does not retry when the dialog is cancelled', async () => {
+    const execution = {
+      id: 'execution-1',
+      taskId: task.id,
+      startedAt: '2026-08-27T01:00:00.000Z',
+      finishedAt: '2026-08-27T01:01:00.000Z',
+      status: 'waiting_to_send' as const,
+      sendTarget: group.m_nsUsrName,
+      userMessage: '日报已生成，但微信暂不可用'
+    }
+    vi.mocked(window.api.listScheduledReportExecutions).mockResolvedValue([execution])
+    render(
+      <ScheduledReportsWorkspace
+        contacts={[group]}
+        onNotice={onNotice}
+        onOpenWechatSettings={onOpenWechatSettings}
+        onOpenAgentHub={onOpenAgentHub}
+      />
+    )
+
+    await waitFor(() => expect(screen.getByText('日报已生成，但微信暂不可用')).toBeVisible())
+    fireEvent.click(screen.getByRole('button', { name: '重新发送' }))
+    const dialog = await screen.findByRole('alertdialog')
+    expect(within(dialog).getByText('目标：' + group.m_nsUsrName)).toBeVisible()
+    expect(within(dialog).getByText('日报：技术交流 · 每日日报')).toBeVisible()
+    expect(within(dialog).getByText(/日期：/)).toBeVisible()
+    fireEvent.click(within(dialog).getByRole('button', { name: '取消' }))
+    expect(window.api.retryScheduledReportSend).not.toHaveBeenCalled()
+
+    fireEvent.click(screen.getByRole('button', { name: '重新发送' }))
+    const secondDialog = await screen.findByRole('alertdialog')
+    fireEvent.click(within(secondDialog).getByRole('button', { name: '确认重新发送' }))
+    await waitFor(() =>
+      expect(window.api.retryScheduledReportSend).toHaveBeenCalledWith(execution.id)
+    )
+    expect(window.api.retryScheduledReportSend).toHaveBeenCalledTimes(1)
+  })
 })
diff --git a/tests/e2e/export-archive.spec.ts b/tests/e2e/export-archive.spec.ts
index 9ded770..5986035 100644
--- a/tests/e2e/export-archive.spec.ts
+++ b/tests/e2e/export-archive.spec.ts
@@ -567,7 +567,51 @@ test('EXPORT-ARCHIVE-04 timeline follows the latest visible month after changing
   }
 })
 
-test('EXPORT-ARCHIVE-05 each message tab restores its previous scroll anchor', async ({ page }) => {
+test('EXPORT-ARCHIVE-05 date navigation jumps across days and years', async ({ page }) => {
+  const outputDir = mkdtempSync(join(tmpdir(), 'wxe-date-timeline-e2e-'))
+  try {
+    const dataPath = join(outputDir, 'data', 'messages.js')
+    mkdirSync(dirname(dataPath), { recursive: true })
+    writeFileSync(join(outputDir, 'index.html'), renderExportPage('日期时间轴档案'), 'utf8')
+    const timestamp = (value: string): number => Math.floor(new Date(value).getTime() / 1000)
+    const messages = [
+      archiveMessage('date-3', 'timeline', '日期时间轴档案', '十二月三十一日', timestamp('2025-12-31T12:00:00+08:00')),
+      archiveMessage('date-1', 'timeline', '日期时间轴档案', '九月一日', timestamp('2026-09-01T12:00:00+08:00')),
+      archiveMessage('date-2', 'timeline', '日期时间轴档案', '九月三日', timestamp('2026-09-03T12:00:00+08:00'))
+    ]
+    writeFileSync(
+      dataPath,
+      'window.__WECHAT_EXPORT__ = ' + JSON.stringify({
+        version: 1,
+        sourceId: 'timeline',
+        name: '日期时间轴档案',
+        exportedAt: '2026-09-04T00:00:00.000Z',
+        messages
+      }) + ';\n',
+      'utf8'
+    )
+
+    await page.goto(pathToFileURL(join(outputDir, 'index.html')).href)
+    const september = page.locator('.timeline-month[data-month="2026-09"]')
+    await expect(september).toBeVisible()
+    await september.click()
+    await expect(page.locator('.timeline-day[data-date="2026-09-01"]')).toBeVisible()
+    await expect(page.locator('.timeline-day[data-date="2026-09-03"]')).toBeVisible()
+    await page.locator('.timeline-day[data-date="2026-09-01"]').click()
+    await expect(page.locator('.timeline-day.active')).toHaveAttribute('data-date', '2026-09-01')
+    await expect(page.locator('.message').filter({ hasText: '九月一日' })).toBeVisible()
+
+    await page.locator('.timeline-year[data-year="2025"]').click()
+    await page.locator('.timeline-month[data-month="2025-12"]').click()
+    await page.locator('.timeline-day[data-date="2025-12-31"]').click()
+    await expect(page.locator('.timeline-day.active')).toHaveAttribute('data-date', '2025-12-31')
+    await expect(page.locator('.message').filter({ hasText: '十二月三十一日' })).toBeVisible()
+  } finally {
+    rmSync(outputDir, { recursive: true, force: true })
+  }
+})
+
+test('EXPORT-ARCHIVE-06 each message tab restores its previous scroll anchor', async ({ page }) => {
   const outputDir = mkdtempSync(join(tmpdir(), 'wxe-tab-position-e2e-'))
   try {
     const dataPath = join(outputDir, 'data', 'messages.js')
diff --git a/tests/integration/export-media-flow.test.ts b/tests/integration/export-media-flow.test.ts
index f3d5972..78accee 100644
--- a/tests/integration/export-media-flow.test.ts
+++ b/tests/integration/export-media-flow.test.ts
@@ -26,6 +26,7 @@ const state = vi.hoisted(() => ({
   avatarMap: {} as Record<string, string>,
   messages: [] as Message[],
   messagesByUser: {} as Record<string, Message[]>,
+  exportErrors: {} as Record<string, string>,
   exportReads: [] as string[],
   selfInfoReads: 0,
   groupSnapshotReads: [] as string[],
@@ -97,6 +98,7 @@ vi.mock('../../src/main/services/chat-service', () => ({
     structuredClone(state.messagesByUser[userMd5] || state.messages),
   listMessagesForExport: async (userMd5: string) => {
     state.exportReads.push(userMd5)
+    if (state.exportErrors[userMd5]) throw new Error(state.exportErrors[userMd5])
     return structuredClone(state.messagesByUser[userMd5] || state.messages)
   },
   getChatDb: () => ({
@@ -279,6 +281,7 @@ describe('media export flow', () => {
       'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAusB9Y9ZQmcAAAAASUVORK5CYII='
     state.videoLookups = []
     state.messagesByUser = {}
+    state.exportErrors = {}
     state.exportReads = []
     state.selfInfoReads = 0
     state.groupSnapshotReads = []
@@ -1233,7 +1236,9 @@ describe('media export flow', () => {
       target('csv-user', '测试联系人')
     ]
     state.messagesByUser = {
-      'csv-group': [message({ id: 'group-text', content: '群聊消息' })],
+      'csv-group': [
+        message({ id: 'group-text', content: '群聊消息, 引号 \" 和换行\\n😀' })
+      ],
       'csv-user': [message({ id: 'user-text', content: '联系人消息' })]
     }
 
@@ -1261,11 +1266,71 @@ describe('media export flow', () => {
     expect(userFiles).toHaveLength(1)
     expect(groupFiles[0]).toMatch(/^测试群聊_\d{8}_\d{6}\.csv$/)
     expect(userFiles[0]).toMatch(/^测试联系人_\d{8}_\d{6}\.csv$/)
-    expect(readFileSync(join(groupDir, groupFiles[0]), 'utf8')).toContain('群聊消息')
+    const groupCsv = readFileSync(join(groupDir, groupFiles[0]))
+    expect(groupCsv.subarray(0, 3)).toEqual(Buffer.from([0xef, 0xbb, 0xbf]))
+    expect(groupCsv.toString('utf8')).toContain('\"群聊消息, 引号 \"\" 和换行\\n😀\"')
+    expect(groupCsv.toString('utf8')).toContain('\r\n')
     expect(readFileSync(join(userDir, userFiles[0]), 'utf8')).toContain('联系人消息')
     expect(existsSync(join(outputDir, 'index.html'))).toBe(false)
   })
 
+  it('continues all-export after one conversation fails and records a truthful manifest', async () => {
+    const { runExport } = await import('../../src/main/export-service')
+    const targets: ExportTarget[] = [
+      target('all-fail-1', '成功会话一'),
+      target('all-fail-2', '失败会话'),
+      target('all-fail-3', '成功会话三')
+    ]
+    state.messagesByUser = Object.fromEntries(
+      targets.map((item) => [item.userMd5, [message({ id: item.userMd5, content: item.name })]])
+    )
+    state.exportErrors = { 'all-fail-2': '模拟单会话读取失败' }
+    const progress: Array<{ phase: string; percent?: number; error?: string }> = []
+    const win = {
+      isDestroyed: () => false,
+      webContents: {
+        send: (_channel: string, item: (typeof progress)[number]) => progress.push(item)
+      }
+    }
+
+    const result = await runExport(
+      {
+        jobId: 'all-export-continue-after-failure',
+        scope: 'all',
+        targets,
+        format: 'html',
+        outputName: 'all-export-continue-after-failure',
+        kinds: ['text'],
+        includeMedia: false
+      },
+      win as never
+    )
+
+    expect(result.success).toBe(false)
+    expect(result.error).toContain('失败会话')
+    expect(result.outputPath).toBeTruthy()
+    expect(state.exportReads).toEqual(['all-fail-1', 'all-fail-2', 'all-fail-3'])
+    expect(existsSync(join(result.outputPath!, '联系人', '成功会话一', 'index.html'))).toBe(true)
+    expect(existsSync(join(result.outputPath!, '联系人', '成功会话三', 'index.html'))).toBe(true)
+    const manifest = JSON.parse(
+      readFileSync(join(result.outputPath!, '导出清单.json'), 'utf8')
+    ) as {
+      status: string
+      conversations: Array<{ id: string; status: string; error?: string }>
+    }
+    expect(manifest.status).toBe('failed')
+    expect(manifest.conversations).toEqual([
+      expect.objectContaining({ id: 'all-fail-1', status: 'completed' }),
+      expect.objectContaining({
+        id: 'all-fail-2',
+        status: 'failed',
+        error: '模拟单会话读取失败'
+      }),
+      expect.objectContaining({ id: 'all-fail-3', status: 'completed' })
+    ])
+    expect(progress.at(-1)).toMatchObject({ phase: 'failed', percent: 100 })
+  })
+
   it('cancels an all-export task between conversations without starting the next database read', async () => {
     const { cancelExport, runExport } = await import('../../src/main/export-service')
     const jobId = 'all-export-cancel'
diff --git a/tests/unit/contact-name.test.ts b/tests/unit/contact-name.test.ts
new file mode 100644
index 0000000..2beae63
--- /dev/null
+++ b/tests/unit/contact-name.test.ts
@@ -0,0 +1,36 @@
+import { describe, expect, it } from 'vitest'
+import {
+  displayContactName,
+  filesystemSafeName,
+  isVisibleName,
+  visibleNamePart
+} from '../../src/shared/contact-name'
+
+describe('contact name safety', () => {
+  it('recognizes private-use, zero-width, and control-only labels as invisible', () => {
+    expect(isVisibleName('\uE000\uE000')).toBe(false)
+    expect(isVisibleName('\u200B\u200D')).toBe(false)
+    expect(displayContactName({ m_nsNickName: '\uE000\uE000', remark: '备注名', wxid: 'wxid_a' })).toBe(
+      '备注名'
+    )
+  })
+
+  it('preserves visible emoji and removes only non-rendering code points', () => {
+    expect(visibleNamePart('  👩‍💻\u200B  ')).toBe('👩💻')
+    expect(
+      displayContactName({
+        m_nsNickName: String.fromCodePoint(0xE0020),
+        wechatId: 'wechat-alias'
+      })
+    ).toBe(
+      'wechat-alias'
+    )
+  })
+
+  it('sanitizes reserved path characters, trailing dots, device names, and length', () => {
+    expect(filesystemSafeName('a/b:c*?"<>|. ')).toMatch(/^a_b_c_+$/)
+    expect(filesystemSafeName('CON')).toBe('CON_')
+    expect(filesystemSafeName('\uE000\uE000', '未命名联系人')).toBe('未命名联系人')
+    expect(Array.from(filesystemSafeName('😀'.repeat(100))).length).toBe(80)
+  })
+})
diff --git a/tests/unit/voice-service.test.ts b/tests/unit/voice-service.test.ts
index 7565f16..407a8ce 100644
--- a/tests/unit/voice-service.test.ts
+++ b/tests/unit/voice-service.test.ts
@@ -51,4 +51,66 @@ describe('VoiceService batch lookup', () => {
     expect(resolveVoice).toHaveBeenNthCalledWith(1, 'session', 10, 100, '1000')
     expect(resolveVoice).toHaveBeenNthCalledWith(2, 'session', 11, 101, '1001')
   })
+
+  it('keeps same local ids isolated by session and server identity, then reuses the exact cache entries', async () => {
+    const getVoiceDataBatch = vi
+      .fn()
+      .mockResolvedValue([
+        { success: true, hex: '0102' },
+        { success: true, hex: '0304' },
+        { success: true, hex: '0506' }
+      ])
+    const service = new VoiceService({ getVoiceDataBatch } as never, '/accounts/fixture-a')
+    const decoder = (service as unknown as {
+      decoderRegistry: { decode: ReturnType<typeof vi.fn> }
+    }).decoderRegistry
+    vi.spyOn(decoder, 'decode').mockImplementation(async (source: { data: Buffer }) => ({
+      pcm: Buffer.from([source.data[0]]),
+      sampleRate: 16_000,
+      channels: 1
+    }))
+
+    const references = [
+      { sessionId: 'session-a', localId: 7, createTime: 100, svrId: 'same-second-a' },
+      { sessionId: 'session-b', localId: 7, createTime: 100, svrId: 'same-second-a' },
+      { sessionId: 'session-a', localId: 7, createTime: 100, svrId: 'same-second-b' }
+    ]
+    const first = await service.resolveVoices(references)
+    expect(first.every((item) => item.success)).toBe(true)
+    expect(new Set(first.map((item) => item.data)).size).toBe(3)
+    expect(getVoiceDataBatch).toHaveBeenCalledOnce()
+
+    const second = await service.resolveVoices(references)
+    expect(second).toEqual(first)
+    expect(getVoiceDataBatch).toHaveBeenCalledOnce()
+  })
+
+  it('versions the in-memory namespace per account so a restarted or switched account cannot reuse old audio', async () => {
+    const client = {
+      getVoiceDataBatch: vi.fn().mockResolvedValue([{ success: true, hex: '0102' }]),
+      getAccountRoot: () => '/accounts/fixture-a'
+    }
+    const first = new VoiceService(client as never)
+    const second = new VoiceService(
+      { ...client, getAccountRoot: () => '/accounts/fixture-b' } as never
+    )
+    const decode = (service: VoiceService, value: number): void => {
+      const decoder = (service as unknown as {
+        decoderRegistry: { decode: ReturnType<typeof vi.fn> }
+      }).decoderRegistry
+      vi.spyOn(decoder, 'decode').mockResolvedValue({
+        pcm: Buffer.from([value]),
+        sampleRate: 16_000,
+        channels: 1
+      })
+    }
+    decode(first, 1)
+    decode(second, 2)
+    const firstCache = (first as unknown as { voiceCache: Map<string, string> }).voiceCache
+    const secondCache = (second as unknown as { voiceCache: Map<string, string> }).voiceCache
+    await expect(first.resolveVoices([{ sessionId: 'session', localId: 1, createTime: 2 }])).resolves.toHaveLength(1)
+    await expect(second.resolveVoices([{ sessionId: 'session', localId: 1, createTime: 2 }])).resolves.toHaveLength(1)
+    expect([...firstCache.keys()][0]).not.toBe([...secondCache.keys()][0])
+    expect(client.getVoiceDataBatch).toHaveBeenCalledTimes(2)
+  })
 })