[FEATURE] Add option to disable automatic worktree creation in desktop app

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When using the Claude Code desktop app, a new git worktree is automatically
created for each conversation. There is no supported setting to disable this behavior.

Proposed Solution

Add a supported configuration option in settings.json to disable automatic
worktree creation. For example:

"worktreeEnabled": false

Environment:

• OS: Windows 11
• App: Claude Code Desktop

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_