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An amalgamation of InteractiveLineSegment and InteractiveHorizontalLine.
Has 2 movable points like LineSeg. But draws to infinity like HorLine.
Could also be written as a new LineExtension property on InteractiveLineSegment to choose from None, ExtendFromStart, ExtendFromEnd, ExtendBoth. .... but i felt it wouldn't be intuitive for Line'Segment' to extend to infinity so i made a new type.
general behavior:

ClickAnywhere behavior to get nearest point on the infinite line (snap-to-candle is external code):
