add support for setting recent emoji

lib/controllers/recent_emoji.dart

@@ -0,0 +1,44 @@
+import "package:collection/collection.dart";
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/controllers/account_data.dart";
+import "package:nexus/controllers/client.dart";
+import "package:nexus/models/account_data.dart";
+
+class RecentEmojiController extends Notifier<IList<RecentEmoji>> {
+  @override
+  IList<RecentEmoji> build() => ref.watch(
+    AccountDataController.provider.select(
+      (value) => value.recentEmoji.recentEmoji,
+    ),
+  );
+
+  Future<void> add(String emoji) => ref
+      .watch(ClientController.provider.notifier)
+      .setAccountData(
+        .new(
+          type: AccountData.recentEmojiKey,
+          content: RecentEmojiData(
+            recentEmoji: .new([
+              .new(
+                emoji: emoji,
+                total:
+                    (state
+                            .firstWhereOrNull(
+                              (element) => element.emoji == emoji,
+                            )
+                            ?.total ??
+                        0) +
+                    1,
+              ),
+              ...state.whereNot((element) => element.emoji == emoji),
+            ]),
+          ),
+        ),
+      );
+
+  static final provider =
+      NotifierProvider.autoDispose<RecentEmojiController, IList<RecentEmoji>>(
+        RecentEmojiController.new,
+      );
+}