fix: 修复媒体导出与 HTML 聊天档案体验

- 修复打包版图片、语音解析不可用，内置 FFmpeg 与必要运行时依赖
- 修复 HTML 导出原图查找、缩略图回退及增量档案媒体解析问题
- 修复本人昵称在软件和 HTML 导出中显示为微信号的问题，并兼容旧档案昵称迁移
- 修复 HTML 语音播放器超出消息气泡的问题
- 优化 HTML 双向滚动加载，大量消息时最多渲染 240 条，避免页面卡顿
- 移除图片解密页面中手动配置 FFmpeg 的相关提示
- 补充图片解密、语音运行时、打包资源和 HTML 导出相关测试

src/main/services/bootstrap-cache.ts

@@ -428,6 +428,37 @@ function isRawContactName(contact: Contact): boolean {
   return false
 }
 
+function accountRootCandidates(accountRoot: string): Set<string> {
+  const directory = path.basename(normalizeRoot(accountRoot))
+  const suffixMatch = directory.match(/^(.+)_([a-zA-Z0-9]{4})$/)
+  return new Set([directory, suffixMatch?.[1] || ''].filter(Boolean))
+}
+
+export function mergeCachedSelfInfo(accountRoot: string, self: CachedSelfInfo): CachedSelfInfo {
+  const cache = readStartupCacheFile(accountRoot)
+  if (!cache) return self
+  const identifiers = accountRootCandidates(accountRoot)
+  if (self.wxid) identifiers.add(self.wxid)
+  const isRawSelfName = (value?: string): boolean => {
+    const name = String(value || '').trim()
+    return !name || name === '我' || identifiers.has(name)
+  }
+  if (!isRawSelfName(self.nickname)) return self
+
+  const cachedContact = cache.contacts.find(
+    (contact) => identifiers.has(contact.m_nsUsrName) && !isRawContactName(contact)
+  )
+  const cachedNickname = !isRawSelfName(cache.self?.nickname)
+    ? cache.self?.nickname
+    : cachedContact?.m_nsNickName
+  if (!cachedNickname) return self
+  return {
+    ...self,
+    nickname: cachedNickname,
+    avatar: self.avatar || cache.self?.avatar || cachedContact?.avatar
+  }
+}
+
 export function mergeCachedContactAvatars(accountRoot: string, contacts: Contact[]): Contact[] {
   const cache = readStartupCacheFile(accountRoot)
   if (!cache?.contacts.length) return contacts

src/main/services/chat-service.ts

@@ -565,6 +565,18 @@ export function getSelfAccountInfo(): SelfAccountInfo | null {
   }
 }
 
+export async function getSelfAccountInfoAsync(): Promise<SelfAccountInfo | null> {
+  const current = dbRef
+  if (!current) return null
+  try {
+    await current.getWcdb4Client().getSessionsAsync({ hydrateDisplayNames: true })
+  } catch {
+    // Nickname hydration is best-effort; the synchronous fallback still returns the account id.
+  }
+  if (dbRef !== current) return getSelfAccountInfo()
+  return getSelfAccountInfo()
+}
+
 export function testConnection(key: string, accountRoot?: string): DatabaseKeyValidationResult {
   const probeKey = key.replace(/^0x/i, '').trim()
   if (!/^[0-9a-f]{64}$/i.test(probeKey)) {

src/main/services/image-decryption-status-service.ts

@@ -124,14 +124,18 @@ export async function testImageDecryption(
       (await service.findImageFileAsync(image.md5, image.datName, {
         allowThumbnail: false,
         accountDir: testAccountDir,
-        sessionId: imageMessage.sessionId
+        sessionId: imageMessage.sessionId,
+        sessionMd5: request.userMd5,
+        createTime: imageMessage.createTime
       })) || undefined
     if (!filePath) {
       filePath =
         (await service.findImageFileAsync(image.md5, image.datName, {
           allowThumbnail: true,
           accountDir: testAccountDir,
-          sessionId: imageMessage.sessionId
+          sessionId: imageMessage.sessionId,
+          sessionMd5: request.userMd5,
+          createTime: imageMessage.createTime
         })) || undefined
     }
     if (!filePath) return finish(failure('FILE_NOT_FOUND', '图片文件不存在'))