Request: highlight position of current log line in log browser map

The addition of the map in the log browser is _awesome_, super handy! Small request that would make it even better though:
- when you select a log line, have it highlight the position on the map (red dot?)

It would be really nice to be able to see the relationship between the log data at a certain point and where it was in the flight path at that time.

The issue names the log browser map and selecting a log line, but no files or tests. Start by locating the log browser map and the code handling current-line selection, then trace how flight-path positions are represented. Done means selecting a log line visibly marks its corresponding position on the map.

Written by the indexing model from the issue text.