View "Ghost dot" from the next stuntsheet, and the flow the current selected dots are taking

[MichaelTamaki]

Follow up from https://github.com/calband/calchart-redesign/pull/179

Add two menu items within "View" for:

• View next stuntsheet dots
• View dots' flows on selection

This may look something like this:

You should be able to copy some of the logic in the linked PR.