[BUG] `theme` property in settings.json not recognized despite being documented

Environment

• Platform (select one):
• [ ] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [x] Other: Max Plan
• Claude CLI version: 1.0.98 (Claude Code)
• Operating System: macOS 15.6.1
• Terminal: VS Code integrated terminal

Bug Description

The theme property in ~/.claude/settings.json is not recognized, despite being documented in the official documentation.

Steps to Reproduce

1. Try to set theme using CLI command: claude config set -g theme "dark" - this doesn't modify ~/.claude/settings.json
2. Manually edit ~/.claude/settings.json and add "theme": "dark" at line 50
3. Open the file in VS Code with Claude Code for VSCode extension enabled
4. VS Code shows error: "Property theme is not allowed"

<img width="428" height="105" alt="Image" src="https://github.com/user-attachments/assets/dbc37aa9-761c-46f9-a858-033cf8c47ce4" />

Expected Behavior

According to the documentation, the theme property should be a valid configuration option in ~/.claude/settings.json for setting the global theme preference.

Actual Behavior

• The CLI command claude config set -g theme "dark" doesn't modify the settings file
• When manually adding "theme": "dark" to the settings.json, VS Code reports it as an invalid property
• The theme setting appears to be unsupported despite being documented

Additional Context

Screenshot showing VS Code error message when theme property is added to settings.json.

This suggests either:

1. The documentation is outdated and theme setting is no longer supported
2. There's a bug in the configuration schema validation
3. The theme setting has been moved to a different location or uses a different syntax