feat: enhance keyboard shortcut help with search and copy

[mangod12]

Summary

Enhances the keyboard shortcut help overlay with search functionality and copy feature.

Changes

• Added search bar to filter shortcuts by name or key
• Added 'Copy All' button to copy shortcuts to clipboard
• Added new shortcut categories: MAP, TELEMETRY
• Added console toggle shortcut (backtick key)
• Improved UI with better layout and responsiveness
• Shows total shortcut count

Use Cases

• Users can quickly find specific shortcuts
• Easy sharing of shortcut reference
• Better discoverability of map and telemetry interactions
• Professional UX matching commercial tools

Testing

• Verified search filters correctly
• Tested copy to clipboard functionality
• Checked responsive layout