Invalid configuration error due to unremovable trailing space in components.json

[librariums]

Bug Description

The shadcn CLI fails with "Invalid configuration found in components.json" due to a trailing space in the $schema URL ("https://ui.shadcn.com/schema.json "). Critically, this space cannot be removed by standard file operations.

Environment

• Node.js: v24.11.1
• npm: 11.6.4
• OS: Linux (ChromeOS Crostini)
• Filesystem: btrfs
• shadcn: latest

Reproduction Steps

1. Create components.json with trailing space after schema URL
2. Run npx shadcn@latest add button
3. Get error: Invalid configuration found
4. Attempt to remove space with:
   • sed -i 's|schema\.json[[:space:]]*"|schema.json"|' components.json
   • awk '{gsub(/schema\.json "/, "schema.json\""); print}' > tmp
   • printf '...' > components.json (heredoc)
   • cp /tmp/fixed.json components.json
5. Verify with cat -A: space still present (`"schema.json $")
6. Permissions check: `