TF-4195 Add Label to Thread

lib/features/thread/data/extensions/map_keywords_extension.dart

@@ -9,6 +9,13 @@ extension MapKeywordsExtension on Map<KeyWordIdentifier, bool>? {
   List<KeyWordIdentifier> get enabledKeywords =>
       this?.entries.where((e) => e.value).map((e) => e.key).toList() ?? [];
 
+  Set<KeyWordIdentifier> get enabledKeywordSet => this == null
+      ? const {}
+      : {
+          for (final entry in this!.entries)
+            if (entry.value) entry.key
+        };
+
   Map<KeyWordIdentifier, bool> withKeyword(KeyWordIdentifier keyword) {
     return Map<KeyWordIdentifier, bool>.from(this ?? {})..[keyword] = true;
   }

lib/features/thread/domain/extensions/presentation_email_map_extension.dart

@@ -16,4 +16,21 @@ extension PresentationEmailMapExtension on Map<EmailId, PresentationEmail?> {
     }
     return newMap;
   }
+
+  Map<EmailId, PresentationEmail?> toggleListEmailsKeywordByIds({
+    required List<EmailId> emailIds,
+    required KeyWordIdentifier keyword,
+    required bool remove,
+  }) {
+    final updatedMap = Map<EmailId, PresentationEmail?>.from(this);
+
+    for (final emailId in emailIds) {
+      final email = updatedMap[emailId];
+      if (email == null) continue;
+
+      updatedMap[emailId] = email.toggleKeyword(keyword, remove);
+    }
+
+    return updatedMap;
+  }
 }