chore(ui): Add export dist/styles.css to fix missing export error

* Adding export dist/styles.css to fix missing export error. See issue 2999.

* Add missing comma

* Create dirty-ladybugs-yell.md

Co-authored-by: William Lee <[email protected]>

Author: SilverLinings89

.changeset/dirty-ladybugs-yell.md

@@ -0,0 +1,5 @@
+---
+"@aws-amplify/ui": patch
+---
+
+Add export dist/styles.css to fix missing export error. See issue #2999.

packages/ui/package.json

@@ -10,6 +10,7 @@
     },
     "./package.json": "./package.json",
     "./styles.css": "./dist/styles.css",
+    "./dist/styles.css": "./dist/styles.css",
     "./theme.css": "./dist/theme.css",
     "./tokens.ts": "./dist/react-native/tokens.ts"
   },