implemented enlarged emoji rendering for chat messages containing up to three emojis

pubspec.yaml

@@ -21,6 +21,9 @@ dependencies:
   async: ^2.11.0
   badges: ^3.1.2
   cached_network_image: ^3.4.1
+  # Grapheme-cluster iteration for emoji-only message detection
+  # (lib/utils/emoji_detection.dart). Already present transitively via flutter.
+  characters: ^1.4.0
   collection: ^1.19.0
   connectivity_plus: ^7.1.0
   crypto: ^3.0.6