Electerm: Importing unsafe bookmark data could lead to unsafe operation when clicking local type bookmark

### Impact _Persistent local-pty code execution via imported bookmarks or compromised sync targets. Affects users who import bookmark JSON files or who have electerm sync configured (gist/WebDAV). The attacker can inject exec* fields or global config to cause remote code to run when a bookmark is opened or when sync is applied._

Patches

Not yet

### Workarounds - Do not import unsafe data

### References - Report / credit: https://github.com/Curly-Haired-Baboon - Electerm releases: https://github.com/electerm/electerm/releases