[Bug] File autocomplete path truncation with `@` symbol in nested directories

Bug Description
The file autocomplete summoned with @ and starting to type a file path has started to truncate the paths to be pretty much unusable in any reasonable codebase with even a few levels of nested directories.

<img width="1730" height="1026" alt="Image" src="https://github.com/user-attachments/assets/ad8f4173-452c-49ab-8e96-91f7d799a614" />

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.5
• Feedback ID: 2a91f8bf-ba7a-4932-8fbb-19a4669a459c

Errors
N/A