feat: 群日报 9 宫格头像自动反推 + 持续时长语义 + 自动登录

- group-report-service: enrichAvatarsFromGroup 从群成员快照反推真头像
  - group-report-service: 修 SVG data URL 正则,fallback 现在能正常嵌入
  - group-report (shared): GroupReportMetadata/Result 加 talker/warnings 字段
  - timeSpan 改为持续时长(\"1 h\" / \"30 min\" / \"2 d\" 紧凑半角)
  - App.tsx 启动自动连接(env var + safeStorage)
  - Wcdb4Client 父目录自动解析为最新 wxid
  - HTTP server EADDRINUSE 友好提示 + 指数退避
  - installSafeConsole 修 EPIPE crash
  - SettingsPanel 测试连接后自动更新 dbRoot

src/main/index.ts

@@ -120,6 +120,8 @@ app.whenReady().then(async () => {
     return databaseKeyStore.save(clipboardKey)
   })
 
+  ipcMain.handle('key:saveDbKey', async (_, key: string) => databaseKeyStore.save(String(key || '')))
+
   ipcMain.handle('key:clearSavedDbKey', async () => databaseKeyStore.clear())
 
   ipcMain.handle('key:autoGetDbKey', async (event) => {