SuggestionMenu collapses when you click the label

[BYODKM]

Describe the bug

When you click .bn-suggestion-menu-label, the SuggestionMenu collapses.

　 To Reproduce https://www.blocknotejs.org/examples/basic/minimal

Misc

• Browser: Mac Chrome 128

[BYODKM]

onMouseDown={(e) => e.preventDefault()} is missing somewhere.

[matthewlipski]

Thanks! Think you're right with the fix