Sending a prompt crashes with `URISyntaxException` when workspace-folder URI is malformed (Error: Illegal char <"> at index)

[snoopier]

Describe the bug**

Sending a chat prompt that contains an @ sign (e.g. an email address like user@aol.com) crashes with:

Error: Illegal char <"> at index 11: "

Check ECA stderr for more details.

Steps to reproduce

1. Open an ECA chat session
2. Type a message containing an @ sign, e.g. send a mail to user@siemens.com
3. Send the prompt
4. Error appears instead of a response

Root cause

contexts-str-from-prompt in context.clj extracts @mentions from the prompt text using the regex @([^\s:]+). When the prompt contains user@siemens.com, it extracts siemens.com as a context path. This extracted string eventually reaches shared/uri->filename which passes it to java.net.URI — and since siemens.com is not a valid file URI, it throws URISyntaxException.

Expected behavior

Text after @ that is not a valid file path or context reference should be ignored. An email address in the prompt should not crash the session.

[ericdallo]

Thank you, fixed!