Add loading state for Connect/Restart buttons

[bfmvsa]

Added loading state indication to buttons. Implemented loading/loadingText props for the button component and updated the Connect/Restart buttons.

Motivation and Context

Users had no visual feedback when clicking buttons that triggered connect/restart operations, leading to confusion and potential duplicate clicks. This change provides immediate loading feedback.

How Has This Been Tested?

• Tested loading states on the button component
• Verified default "Loading..." text and custom loading text
• Tested both buttons with loading prop
• Confirmed buttons are disabled during loading

Breaking Changes

None.

Types of changes

• 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

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

Additional context

screenshot.2025-07-19.at.18.17.44.mov