termimus/termimus-ssh ? reverse-engineered prompt

Build me a modern desktop SSH manager for Linux, macOS, and Windows, with a local first feel and a dark terminal style. I want to save hosts, SSH keys, usernames, passwords, and reusable snippets, then open multiple terminal sessions in tabs and split panes, with quick search so I can jump to a server fast.

Please include SFTP browsing with a simple two pane file transfer view, a built in editor for remote files, and support for port forwarding tunnels too. It should feel safe by default, with encrypted local storage, automatic locking, host key verification, and optional unlock through the system keychain.

I also want a way to group servers into workspace presets so I can launch several machines at once in a chosen layout, and a self hosted sync option so the same encrypted data can stay in sync across devices without exposing my secrets. If you need to, look up current docs online for the desktop shell and terminal libraries you want to use.