Stable identity and readable labels for vehicle position markers

get_rt_vehicle_positions built properties.id and properties.title from
the raw route_id, the direction and the last 3 digits of the crc32 of
the trip_id. Two problems:

- geo_json_events registers each marker with unique_id
  <config_entry_id>_<properties.id>. The crc32 of the trip_id changes
  on every trip, so every vehicle came back as a brand-new entity on
  each run and the entity registry grew without bound.
- the title becomes the entity name on the map card, and labels like
  "ORLEANS:Line:40(0)156_bus" are unreadable there.

Use the feed's vehicle id as the stable part of the identity
(line_direction_vehicle) so a vehicle keeps the same entity across
trips and days, and build the title from the line, the configured
destination and the vehicle id ("40 -> Gaston Galloux 7015"). Fall back
on the original crc-based id/label when the feed has no vehicle id or
the config entry has no usable destination (local-stop sensors).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: Pulpyyyy

custom_components/gtfs2/gtfs_rt_helper.py

@@ -344,8 +344,28 @@ def get_rt_vehicle_positions(self):
             geojson_element["geometry"]["coordinates"] = []
             geojson_element["geometry"]["coordinates"].append(vehicle["position"]["longitude"])
             geojson_element["geometry"]["coordinates"].append(vehicle["position"]["latitude"])
-            geojson_element["properties"]["id"] = str(self._route_id) + "(" + str(vehicle["trip"]["direction_id"]) + ")" + str(binascii.crc32((vehicle["trip"]["trip_id"]).encode('utf8')))[-3:]
-            geojson_element["properties"]["title"] = str(self._route_id) + "(" + str(vehicle["trip"]["direction_id"]) + ")" + str(binascii.crc32((vehicle["trip"]["trip_id"]).encode('utf8')))[-3:] + "_" + self._icon.split(':')[1]
+            # Stable, human-readable marker identity.
+            # geo_json_events registers each marker with unique_id
+            # <config_entry_id>_<properties.id>; the crc32 of the trip_id changes
+            # every trip, so each vehicle came back as a brand-new entity on every
+            # run and the entity registry grew without bound. The vehicle id is
+            # stable across trips and days, so the entity (and its name) is reused.
+            # The map card uses the title as entity name; fall back on the original
+            # crc-based label when the config entry carries no usable destination
+            # (e.g. local-stop sensors) or the feed publishes no vehicle id.
+            _line = str(self._route_id).split(":")[-1]
+            _crc = str(binascii.crc32((vehicle["trip"]["trip_id"]).encode('utf8')))[-3:]
+            _veh = str(vehicle.get("vehicle", {}).get("id", "") or vehicle.get("vehicle", {}).get("label", "")).strip()
+            try:
+                _dest = self.config_entry.data.get("destination", "").split(": ")[-1].split(" (")[0].split(" - ")[0].strip()
+            except Exception:  # the label is cosmetic, it must never break the update
+                _dest = ""
+            if _dest:
+                _label = _line + " → " + _dest + " " + (_veh or _crc)
+            else:
+                _label = str(self._route_id) + "(" + str(vehicle["trip"]["direction_id"]) + ")" + _crc + "_" + self._icon.split(':')[1]
+            geojson_element["properties"]["id"] = _line + "_" + str(vehicle["trip"]["direction_id"]) + "_" + (_veh or _crc)
+            geojson_element["properties"]["title"] = _label
             geojson_element["properties"]["trip_id"] = vehicle["trip"]["trip_id"]
             geojson_element["properties"]["route_id"] = str(self._route_id)
             geojson_element["properties"]["direction_id"] = vehicle["trip"]["direction_id"]