Show Live/Ended status on LiveTrack sessions

A session's own end timestamp is absent until the activity is
actually stopped, so its presence/absence is the status signal — no
new data needed, just reading what was already there. Shown as a
badge next to the session in the list and in its map hover popup.

lib/maptool/livetrack_client.rb

@@ -43,6 +43,11 @@ module Maptool
     # Distance/duration/activity type come from the last track point (its
     # totals are cumulative for the whole session), name/type from the
     # session details — nil-safe throughout since either can be missing.
+    #
+    # "active": Garmin doesn't set a session's `end` until the activity is
+    # actually stopped, so its absence means the session is still recording
+    # — inferred from the one (already-ended) session this was built
+    # against, not verified against a session actually caught mid-activity.
     def self.summarize(result)
       last = result.points.last || {}
       session = result.session || {}
@@ -51,6 +56,7 @@ module Maptool
         "activity_type" => last["activityType"],
         "distance_meters" => last["totalDistanceMeters"],
         "duration_secs" => last["totalDurationSecs"],
+        "active" => session["end"].nil?,
         "start" => session["start"],
         "end" => session["end"],
       }
@@ -145,6 +151,11 @@ if __FILE__ == $0
   raise "expected $undefined cleaned to nil" unless result.points[0]["totalDistanceMeters"].nil?
   raise "expected summary from last point" unless summary["activity_type"] == "CYCLING" && summary["distance_meters"] == 5000
   raise "expected session name in summary" unless summary["session_name"] == "Test Ride"
+  raise "expected inactive: session has an end" if summary["active"]
+
+  ongoing_session = session.merge("end" => nil)
+  ongoing_summary = Maptool::LiveTrackClient.summarize(Maptool::LiveTrackClient::Result.new(points: result.points, session: ongoing_session))
+  raise "expected active: session has no end" unless ongoing_summary["active"]
 
   no_points = client.send(:search, client.send(:parse_payloads, "<html></html>")) { |n| n["trackPoints"] if n["trackPoints"].is_a?(Array) }
   raise "expected nil when no trackPoints present" unless no_points.nil?