Bug Report: Hotkeys Stop Working After Switching Between Preview and Edit Modes

🐛 Bug Description

When using the Markdoc editor, keyboard shortcuts (hotkeys) stop functioning after switching from editing mode to preview mode and back to editing mode.

🔍 Steps to Reproduce

1. Navigate to the editor page (/create or /create/{id})
2. Start typing in the editor textarea
3. Test any hotkey (e.g., Ctrl+B for bold, Ctrl+I for italic, Ctrl+1 for heading 1)
   • ✅ Hotkeys work correctly
4. Click the "View preview" button
5. Click the "Back to editing" button
6. Try using the same hotkeys again
   • ❌ Hotkeys no longer work

🎯 Expected Behavior

Hotkeys should continue to work normally after switching between preview and edit modes.

💻 Current Behavior

Hotkeys become unresponsive after returning from preview mode to editing mode.

Affected Hotkeys

All markdown formatting hotkeys are affected:

• Ctrl+1 through Ctrl+6 - Headings
• Ctrl+B - Bold
• Ctrl+I - Italic
• Ctrl+Shift+B - Bold Italic
• Ctrl+S - Code snippet
• Ctrl+Shift+C - Code block
• Ctrl+Shift+. - Block quote
• Ctrl+L - Link
• Ctrl+Shift+I - Image
• Ctrl+U - URL
• Backspace - Select previous