Visual highlight should follow the navigation in math expression when in interactive mode

### Steps to reproduce
* Enable Visual Highlight, at least browse mode cursor.
* Navigate to a math expression
* Enter interactive mode and explore the expression

### Expected result
Browse mode cursor should help follow the selected subpart of the math expression being explored. Alternatively, another highlighter should allow to follow the subpart of the expression that is being explored, e.g. allow navigator object to follow the selected subpart of the math expression, so that navigator object highlight can be used.

### Configuration
* MathCAT 0.6.6
* Chrome 132
* NVDA 2024.4.2
* Windows 10 22H2 (AMD64) build 19045.5371

### Note
Maybe NVDA itself should provide some information or extension points to help the math provider to do this job. Please explain what should be additionally required from NVDA if needed.