TF-2116 Apply new design for web composer

(cherry picked from commit 1295eb59b2f5abd1095c00ade53c90f7d4f1ecd6)

lib/features/composer/presentation/model/formatting_options_state.dart

@@ -0,0 +1,5 @@
+
+enum FormattingOptionsState {
+  enabled,
+  disabled
+}

lib/features/composer/presentation/model/prefix_recipient_state.dart

@@ -0,0 +1,5 @@
+
+enum PrefixRecipientState {
+  enabled,
+  disabled
+}