[Glitch] Emoji: Update emoji categories with featured emoji

Port c5c8100d02 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/api_types/custom_emoji.ts

@@ -1,8 +1,9 @@
-// See app/serializers/rest/account_serializer.rb
+// See app/serializers/rest/custom_emoji_serializer.rb
 export interface ApiCustomEmojiJSON {
   shortcode: string;
   static_url: string;
   url: string;
   category?: string;
+  featured?: boolean;
   visible_in_picker: boolean;
 }

app/javascript/flavours/glitch/models/custom_emoji.ts

@@ -11,6 +11,7 @@ export const CustomEmojiFactory = ImmutableRecord<CustomEmojiShape>({
   static_url: '',
   url: '',
   category: '',
+  featured: false,
   visible_in_picker: false,
 });