KaTeX custom macros not loaded in plugin panel

[ngc-2371]

Thanks a lot for fixing the issue with loading KaTeX in the plugin panel!
However there's still one small bug:
Custom macros work when defined in the same math block they are used:

but not when defined in a different math block in the same note:

[cqroot]

Currently when the plugin renders the title, it only processes the current line without considering the context.

There are many changes that need to be made to implement this feature. I would consider implementing it in the future, but not anytime soon.