[BUG/Feature] Hooks UI does not allow for "empty"/null matcher

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: Current version: 1.0.56
• Operating System: macOS 15.5
• Terminal: VS-Code terminal

Bug Description

The "universal" (catch-all) matcher for a hook is either empty string or omit "matcher", per the docs:

omit “matcher” or use "matcher": ""

But in the /hooks "UI", there is no way to omit "matcher" or submit empty string. Submitting "" produces "\"\"", i.e. a "quoted" empty string, which does not match the same way (doesn't match anything). So, again, the /hooks interface forces the user outside of the primary flow, which is non-optimal IMO.