[BUG] `@` file completion results in space after file name when pressing Tab or Enter

Environment

• Platform (select one):
• [ ] Anthropic API
• [X] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.90
• Operating System: 5.10.220-209.869.amzn2.x86_64
• Terminal: VSCode

Bug Description

I want to select a file a few levels deep using @, so I type @.clau and then press Enter. Instead of getting @.claude/ I get @.claude/ (note the final (space) character), and I am unable to then type set<Enter> and get @.claude/settings.json--instead, I have to press Backspace after pressing the first Enter and then continue typing set....

Steps to Reproduce

1. Ensure a file at .claude/settings.json exists
2. Type @.clau<Enter>

Expected Behavior

CLI should show @.claude/ and offer a list of files inside the .claude dir.

Actual Behavior

CLI shows @.claude/ (note the final (space)) and no list of files to select from. User must press Backspace to get back to the file listing options. The user must press Backspace after every single completion using either Enter or Tab.