[BUG] Special characters in context finder search

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: <!-- output of claude --version -->
• Operating System: <!-- e.g. macOS 14.3, Windows 11, Ubuntu 22.04 -->
• Terminal: <!-- e.g. iTerm2, Terminal App -->

Bug Description

When using the @ for adding specific files as context, claude-code stops matching when there are special characters in the path like [ or (.

For example, it will return results for @app/api/product/ but will show 0 results for @app/api/product/[id].

Steps to Reproduce

1. Write a path in @ context picker that includes [

Expected Behavior

1. Continue showing results that match the special characters

Additional Context

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