LG-5764 add default export for new package format (#3487)

* feat: add default export for new package format

* docs: changeset

* refactor: move "default" to last field in the export object

Author: nima-taheri-mongodb

.changeset/shaky-regions-vanish.md

@@ -0,0 +1,5 @@
+---
+'@lg-charts/legend': patch
+---
+
+Add a "default" export at the top level of package.json to improve compatibility with Jest module resolution in consumer projects, since Jest does not handle nested "exports" mappings well.

charts/legend/package.json

@@ -52,7 +52,8 @@
           "production": "./dist/umd/index-min.js"
         },
         "default": "./dist/umd/index.js"
-      }
+      },
+      "default": "./dist/umd/index.js"
     }
   },
   "typesVersions": {}