fix: adjust text alignment for measuring box

[BryonLewis]

Zooming out caused the text to move significantly when using the bounding box.

20251003-BatAI-MeasuringTextAlignment_small.mp4

• Removes all offsetX and offsetY setting for values
• Updates the TextData with BoundingBoxTextData that includes textAlign and textBaseline
  • textAlign allows you to specify the start/end/center location for the X-axis of the text
  • textBaseline allows you to specify the top/middle/bottom for the Y-axis fo the text
• Using these I could get rid of deteremineFreqOffset
• I replaced all ms with ₘₛ the subscript version that is used else where in the annotation area. It just reduces the size of text to hopefully make it easier if things are closer together.
• Also did a minor adjustment to the types.ts, I had an extra visible type declaration so I cleaned that up.