lib/word_search: calculate isCommon

lib/models/word_search/word_search_result.dart

@@ -10,6 +10,9 @@ class WordSearchResult {
   /// The ID of the entry in the database.
   final int entryId;
 
+  /// Whether the word is common or not.
+  final bool isCommon;
+
   /// The variants of the word in Japanese.
   final List<WordSearchRuby> japanese;
 
@@ -30,6 +33,7 @@ class WordSearchResult {
 
   const WordSearchResult({
     required this.entryId,
+    required this.isCommon,
     required this.japanese,
     required this.kanjiInfo,
     required this.readingInfo,
@@ -40,6 +44,7 @@ class WordSearchResult {
 
   Map<String, dynamic> toJson() => {
         'entryId': entryId,
+        'isCommon': isCommon,
         'japanese': japanese.map((e) => e.toJson()).toList(),
         'kanjiInfo':
             kanjiInfo.map((key, value) => MapEntry(key, value.toJson())),
@@ -53,6 +58,7 @@ class WordSearchResult {
   factory WordSearchResult.fromJson(Map<String, dynamic> json) =>
       WordSearchResult(
         entryId: json['entryId'] as int,
+        isCommon: json['isCommon'] as bool,
         japanese: (json['japanese'] as List<dynamic>)
             .map((e) => WordSearchRuby.fromJson(e))
             .toList(),