feat(travel): Refactor route handling to use direction instead of destination

main/external/mtr/line_info.cpp

@@ -51,3 +51,12 @@ LineInfo::LineInfo(cJSON* line_json) {
     ESP_LOGW(LINE_INFO_TAG, "Missing or invalid 'stations' array");
   }
 }
+
+const char* LineInfo::get_station_name(const std::string& station_code) const {
+  for (const auto& station : _stations) {
+    if (std::string(station.code()) == station_code) {
+      return station.name();
+    }
+  }
+  return "";
+}