use dot shorthands for default immutable collections where possible

lib/controllers/rooms.dart

@@ -35,7 +35,7 @@ class RoomsController extends Notifier<IMap<String, Room>> {
 
   void update(
     IMap<String, Room> rooms, [
-    ISet<String> leftRooms = const ISet.empty(),
+    ISet<String> leftRooms = const .empty(),
   ]) {
     final merged = rooms.entries.fold(state, (acc, entry) {
       final roomId = entry.key;

lib/models/account_data.dart

@@ -12,7 +12,7 @@ class const AccountData({
       const InvitePermissionConfig(),
 
   @JsonKey(name: AccountData.directKey)
-  final IMap<String, IList<String>> directMessages = const IMap.empty(),
+  final IMap<String, IList<String>> directMessages = const .empty(),
 
   @JsonKey(name: AccountData.recentEmojiKey)
   final RecentEmojiData recentEmoji = const RecentEmojiData(),
@@ -30,7 +30,7 @@ class const AccountData({
 @Freezed(toJson: false, fromJson: false)
 @JsonSerializable()
 class const RecentEmojiData({
-  final IList<RecentEmoji> recentEmoji = const IList.empty(),
+  final IList<RecentEmoji> recentEmoji = const .empty(),
 }) with _$RecentEmojiData {
   Map<String, Object?> toJson() => _$RecentEmojiDataToJson(this);
 

lib/models/content/power_levels.dart

@@ -28,7 +28,7 @@ sealed class PowerLevelsContent extends Content with _$PowerLevelsContent {
 @JsonSerializable()
 class const Notifications({
   final int room = 50,
-  final IMap<String, int> other = const IMap.empty(),
+  final IMap<String, int> other = const .empty(),
 }) with _$Notifications {
   Map<String, Object?> toJson() => _$NotificationsToJson(this);
 

lib/models/event.dart

@@ -18,7 +18,7 @@ class const Event({
   required final String sender,
   @JsonKey(readValue: Event.typeJsonFromJson) required final String type,
   @EpochDateTimeConverter() required final DateTime timestamp,
-  final IMap<String, dynamic> unsigned = const IMap.empty(),
+  final IMap<String, dynamic> unsigned = const .empty(),
   final LocalContent? localContent,
   final String? transactionId,
   final String? redactedBy,
@@ -27,7 +27,7 @@ class const Event({
   final String? replyTo,
   final String? decryptionError,
   final String? sendError,
-  final IMap<String, int> reactions = const IMap.empty(),
+  final IMap<String, int> reactions = const .empty(),
   @JsonKey(name: "last_edit_rowid") final int lastEditRowId = 0,
   final UnreadType? unreadType,
   final Profile? pmp,

lib/models/event_context.dart

@@ -13,7 +13,7 @@ class const EventContext({
   required final IList<Event> after,
   required final String start,
   required final String end,
-  final IList<Event> relatedEvents = const IList.empty(),
+  final IList<Event> relatedEvents = const .empty(),
 }) with _$EventContext {
   Map<String, Object?> toJson() => _$EventContextToJson(this);
 

lib/models/paginate_manual.dart

@@ -9,7 +9,7 @@ part "paginate_manual.g.dart";
 @JsonSerializable()
 class const PaginateManual({
   required final IList<Event> events,
-  final IList<Event> relatedEvents = const IList.empty(),
+  final IList<Event> relatedEvents = const .empty(),
   required final String? nextBatch,
 }) with _$PaginateManual {
   Map<String, Object?> toJson() => _$PaginateManualToJson(this);

lib/models/profile_response.dart

@@ -40,7 +40,7 @@ class const Profile({
   final String? timezone,
 
   @JsonKey(readValue: Profile.readPronouns, name: "m.pronouns")
-  final IList<Pronoun> pronouns = const IList.empty(),
+  final IList<Pronoun> pronouns = const .empty(),
 }) with _$Profile {
   Map<String, Object?> toJson() => _$ProfileToJson(this);
 

lib/models/requests/create_room.dart

@@ -13,10 +13,10 @@ class const CreateRoomRequest({
   final String? roomAliasName,
   final String? name,
   final String? topic,
-  final IList<String> invite = const IList.empty(),
+  final IList<String> invite = const .empty(),
   @JsonKey(name: "uk.timedout.msc4491.invite_reason")
   final String? inviteReason,
-  final IList<InitialStateEvent> initialState = const IList.empty(),
+  final IList<InitialStateEvent> initialState = const .empty(),
   final RoomPreset? preset,
   final bool isDirect = false,
   final IMap<String, dynamic>? creationContent,

lib/models/requests/join_room.dart

@@ -8,7 +8,7 @@ part "join_room.g.dart";
 @JsonSerializable()
 class const JoinRoomRequest({
   required final String roomIdOrAlias,
-  final IList<String> via = const IList.empty(),
+  final IList<String> via = const .empty(),
 
   /// Set when accepting an invite, so gomuks can mark DMs as such.
   final bool fromInvite = false,

lib/models/requests/send_message.dart

@@ -25,7 +25,7 @@ class const SendMessageRequest({
 @JsonSerializable()
 class const Mentions({
   final bool room = false,
-  final IList<String> userIds = const IList.empty(),
+  final IList<String> userIds = const .empty(),
 }) with _$Mentions {
   Map<String, Object?> toJson() => _$MentionsToJson(this);
 

lib/models/room.dart

@@ -14,15 +14,15 @@ class const Room({
 
   /// [timeline] is an IMap of timelineRowId to eventRowId
   @JsonKey(fromJson: Room.timelineTupleJsonToIMap)
-  final IMap<int, int?> timeline = const IMap.empty(),
+  final IMap<int, int?> timeline = const .empty(),
 
   /// [clientSticky] is an ISet of eventRowId
   @JsonKey(includeFromJson: false, includeToJson: false)
-  final ISet<int> clientSticky = const ISet.empty(),
+  final ISet<int> clientSticky = const .empty(),
 
   /// [events] is an IMap of eventRowId to event
   @JsonKey(fromJson: Room.eventsJsonToIMap)
-  final IMap<int, Event> events = const IMap.empty(),
+  final IMap<int, Event> events = const .empty(),
 
   final bool reset = false,
   @JsonKey(includeFromJson: false, includeToJson: false)
@@ -34,9 +34,9 @@ class const Room({
   @JsonKey(includeFromJson: false, includeToJson: false)
   final bool hasFetchedMembers = false,
 
-  final IMap<String, IMap<String, int>> state = const IMap.empty(),
+  final IMap<String, IMap<String, int>> state = const .empty(),
 
-  final IMap<String, IList<ReadReceipt>> receipts = const IMap.empty(),
+  final IMap<String, IList<ReadReceipt>> receipts = const .empty(),
   final bool dismissNotifications = false,
   final bool hasMore = true,
 

lib/models/sync_data.dart

@@ -11,10 +11,10 @@ part "sync_data.g.dart";
 @JsonSerializable(createToJson: false)
 class const SyncData({
   final bool clearState = false,
-  final IMap<String, IMap<String, dynamic>> accountData = const IMap.empty(),
-  final IMap<String, Room> rooms = const IMap.empty(),
-  final ISet<String> leftRooms = const ISet.empty(),
-  final IList<InvitedRoom> invitedRooms = const IList.empty(),
+  final IMap<String, IMap<String, dynamic>> accountData = const .empty(),
+  final IMap<String, Room> rooms = const .empty(),
+  final ISet<String> leftRooms = const .empty(),
+  final IList<InvitedRoom> invitedRooms = const .empty(),
   final IMap<String, IList<SpaceEdge>>? spaceEdges,
   final IList<String>? topLevelSpaces,
 }) with _$SyncData {

lib/widgets/room_menu_button.dart

@@ -15,7 +15,7 @@ import "package:nexus/main.dart";
 
 final class const RoomMenuButton(
   final Room? room, {
-  final IList<Room> children = const IList.empty(),
+  final IList<Room> children = const .empty(),
   super.key,
 }) extends ConsumerWidget {
   @override