Username with at (@) symbol seems to break path handling

[karljs]

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Describe the bug

On my company machine, I have a username which is my email address, namely something like karljs@company.com. When I run eca, it seems to break something in the path handling that causes files to be written to: /home/karljs@company.com/?/.cache/eca/db.transit.json with a literal question mark character as the directory name.

I've seen buggy behavior that I assume is related to this, which causes my login to not persist, for example.

To Reproduce

Steps to reproduce the behavior:

1. Have a username structured like an email address
2. Use eca
3. See the creation of a ? directory in $HOME.

Expected behavior

Cache files are placed in $HOME/.cache/eca

Doctor

ECA version: 0.138.1

Server cmd: /home/karl.smeltzer@canonical.com/dotfiles/emacs.d/var/eca/eca server

Workspaces: /home/karl.smeltzer@canonical.com

Default model: github-copilot/gpt-5.2 (Subscription (oauth), expires 2026-06-04 12:31)

Logged providers: 
github-copilot: Subscription (oauth), expires 2026-06-04 12:31

Relevant env vars: 
XDG_ACTIVATION_TOKEN=gno**********349
DEBUGINFOD_URLS=https://debuginfod.ubuntu.com 


Credential files: None found