I understand that you need this feature in Obsidian, but you could also use your OS’s built in type checker or an external service like Grammarly to do the check for you as a workaround. Personally, I had purchased Typinator recently and it does the auto correction for me when typing but it’s paid so that might not be everyone’s cup of tea.
Spell check is helpful when you are creating note names by first typing names into a note. However, when creating a note using ctrl n or editing name of an existing note, there are no spellchecking capabilities.
Proposed solution
A toggle to spell check all note names in the explorer and the titles of note panes would be helpful.