Show bus stops and coach stations on trip map.

Add case "bus" to get_locations() and bus route handling to
get_trip_routes() in trip.py. Coach stations now populate a dedicated
"coach_station" dict instead of the train station list. Add
"coach_station" (🚌) and "bus_stop" (🚏) emoji types to map.js.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

static/js/map.js

@@ -6,6 +6,8 @@ var emojiByType = {
   "station": "🚉",
   "airport": "✈️",
   "ferry_terminal": "🚢",
+  "coach_station": "🚌",
+  "bus_stop": "🚏",
   "accommodation": "🏨",
   "conference": "🖥️",
   "event": "🍷"