fix: prevent copy button overlap with long text in JsonView (fixes #769)

[nitishagar]

Prevent copy button overlap with long text in JsonView #769

Motivation and Context

• Add right padding (pr-12) to content area to ensure text doesn't flow under the absolutely positioned copy button

How Has This Been Tested?

• Add unit tests to verify the padding is applied correctly
• Add E2E test to prevent regression

Breaking Changes

No

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update

Checklist

• [x] I have read the MCP Documentation
• [x] My code follows the repository's style guidelines
• [x] New and existing tests pass locally
• [ ] I have added appropriate error handling
• [ ] I have added or updated documentation as needed

Additional context

NA

[cliffhall]

Hi @nitishagar Can you please include before and after screenshots so we can see what this does?