feat: animoji реакции

lib/backend/modules/animoji.dart

@@ -2,6 +2,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 
 import '../api.dart';
 import '../../core/protocol/opcode_map.dart';
+import '../../core/utils/emoji_keyword_index.dart';
 import '../../core/utils/logger.dart';
 import '../../models/animoji.dart';
 
@@ -23,6 +24,7 @@ class AnimojiModule {
   static const int _maxRecents = 24;
 
   final Map<int, Animoji> _byId = {};
+  final Map<String, Animoji> _byEmoji = {};
   List<int> _orderedIds = [];
   List<int> _recentIds = [];
   bool _recentsLoaded = false;
@@ -50,7 +52,7 @@ class AnimojiModule {
 
   Future<void> noteUsed(Animoji animoji) async {
     await ensureRecentsLoaded();
-    _byId[animoji.id] = animoji;
+    _remember(animoji);
     _recentIds.remove(animoji.id);
     _recentIds.insert(0, animoji.id);
     if (_recentIds.length > _maxRecents) {
@@ -72,6 +74,9 @@ class AnimojiModule {
 
   Animoji? cached(int id) => _byId[id];
 
+  Animoji? findByEmoji(String emoji) =>
+      _byEmoji[EmojiKeywordIndex.normalize(emoji)];
+
   Future<Animoji?> fetchById(int id) async {
     final known = _byId[id];
     if (known != null) return known;
@@ -84,7 +89,7 @@ class AnimojiModule {
     for (final e in list) {
       if (e is! Map) continue;
       final animoji = Animoji.fromMap(e);
-      if (animoji != null) _byId[animoji.id] = animoji;
+      if (animoji != null) _remember(animoji);
     }
     return _byId[id];
   }
@@ -152,7 +157,7 @@ class AnimojiModule {
       for (final e in list) {
         if (e is! Map) continue;
         final animoji = Animoji.fromMap(e);
-        if (animoji != null) _byId[animoji.id] = animoji;
+        if (animoji != null) _remember(animoji);
       }
     }
 
@@ -160,6 +165,11 @@ class AnimojiModule {
     logger.i('Анимодзи: ${_orderedIds.length} доступно для реакций');
   }
 
+  void _remember(Animoji animoji) {
+    _byId[animoji.id] = animoji;
+    _byEmoji[EmojiKeywordIndex.normalize(animoji.emoji)] = animoji;
+  }
+
   List<int> _dedup(List<int> ids) {
     final seen = <int>{};
     final result = <int>[];