feat: cartões de publicação em canais e corrreções de salas arquivadas

- Canais: publicações viram cartões de largura total mantendo todas as
  funções do balão (reações, resposta, editar, excluir, comentários em
  thread). Composer de publicação fica restrito a admins no feed; membros
  comentam via tela de thread. Canais novos usam events_default 0 para
  permitir comentários e reações.
- Ao sair/excluir uma sala, a cópia local é removida do banco imediatamente;
  salas já deixadas no servidor não apresentam mais erro ao excluir de novo.
- Classificação mural/canal carregada direto do sync (room_type em
  importantStateEvents + postLoad) sem precisar abrir a sala.
- Diálogos com raio e padding reduzidos (dialogTheme, text input e ok/cancel).
- Ícones do app regenerados (logo_background) e dependência linkify.

lib/utils/client_manager.dart

@@ -11,6 +11,7 @@ import 'package:tatchat/utils/custom_http_client.dart';
 import 'package:tatchat/utils/custom_image_resizer.dart';
 import 'package:tatchat/utils/init_with_restore.dart';
 import 'package:tatchat/utils/matrix_live_kit_calls/matrix_live_kit_call_member.dart';
+import 'package:tatchat/utils/matrix_sdk_extensions/room_extension.dart';
 import 'package:tatchat/utils/platform_infos.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
@@ -130,6 +131,9 @@ abstract class ClientManager {
         'im.ponies.room_emotes',
         // To display call state in chat list
         MatrixRtcCallMember.eventType,
+        // Make the canal/mural room type marker available in the chat list
+        // right after sync, even for rooms that are still partially loaded.
+        roomTypeStateEvent,
       },
       customImageResizer: PlatformInfos.supportsCustomImageResizer
           ? customImageResizer

lib/utils/matrix_sdk_extensions/room_extension.dart

@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: 2019-Present Christian Kußowski
+// SPDX-FileCopyrightText: 2019-Present Contributors to FluffyChat
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import 'package:matrix/matrix.dart';
+import 'package:tatchat/config/app_config.dart';
+
+/// State event type that marks the room category (canal/mural) on a room
+/// level. Unlike the personal tags (per-account data), this marker is shared
+/// by all room members which makes the categorization consistent across
+/// different accounts.
+const String roomTypeStateEvent = 'tatuchat.room_type';
+
+extension RoomTypeExtension on Room {
+  String? get roomType =>
+      getState(roomTypeStateEvent)?.content.tryGet<String>('type');
+
+  bool get isCanal =>
+      tags.keys.contains(AppConfig.canalTag) || roomType == 'canal';
+
+  bool get isMural =>
+      tags.keys.contains(AppConfig.muralTag) || roomType == 'mural';
+
+  /// Whether the account left (or was banned from) this room. Such rooms must
+  /// not be shown in the chat list, even if a stale local copy with an old
+  /// "join" membership reappears after a restart.
+  bool get isLeftOrBanned =>
+      {Membership.leave, Membership.ban}.contains(membership);
+
+  Future<String> setRoomType(String type) =>
+      client.setRoomStateWithKey(id, roomTypeStateEvent, '', {'type': type});
+}