feat: add message translation support

- Introduced translation functionality in chat screen, allowing users to translate messages before sending.
- Added MessageTranslationButton to the input bar for enabling/disabling translation.
- Implemented translation service to handle incoming and outgoing text translations using llama models.
- Enhanced message storage to include original and translated text, language codes, and translation status.
- Created UI components for displaying translated messages and managing translation options.
- Added translation model management, including downloading and storing models locally.
- Updated app settings to manage translation preferences and model selections.

lib/storage/channel_message_store.dart

@@ -3,6 +3,7 @@ import 'dart:typed_data';
 import 'package:meshcore_open/utils/app_logger.dart';
 
 import '../models/channel_message.dart';
+import '../models/translation_support.dart';
 import '../helpers/smaz.dart';
 import 'prefs_manager.dart';
 
@@ -98,6 +99,11 @@ class ChannelMessageStore {
       'senderKey': msg.senderKey != null ? base64Encode(msg.senderKey!) : null,
       'senderName': msg.senderName,
       'text': msg.text,
+      'originalText': msg.originalText,
+      'translatedText': msg.translatedText,
+      'translatedLanguageCode': msg.translatedLanguageCode,
+      'translationStatus': msg.translationStatus.value,
+      'translationModelId': msg.translationModelId,
       'timestamp': msg.timestamp.millisecondsSinceEpoch,
       'isOutgoing': msg.isOutgoing,
       'status': msg.status.index,
@@ -126,6 +132,13 @@ class ChannelMessageStore {
           : null,
       senderName: json['senderName'] as String,
       text: decodedText,
+      originalText: json['originalText'] as String?,
+      translatedText: json['translatedText'] as String?,
+      translatedLanguageCode: json['translatedLanguageCode'] as String?,
+      translationStatus: parseMessageTranslationStatus(
+        json['translationStatus'],
+      ),
+      translationModelId: json['translationModelId'] as String?,
       timestamp: DateTime.fromMillisecondsSinceEpoch(json['timestamp'] as int),
       isOutgoing: json['isOutgoing'] as bool,
       status: ChannelMessageStatus.values[json['status'] as int],

lib/storage/message_store.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'dart:typed_data';
 import '../models/message.dart';
+import '../models/translation_support.dart';
 import '../helpers/smaz.dart';
 import '../utils/app_logger.dart';
 import 'prefs_manager.dart';
@@ -83,6 +84,11 @@ class MessageStore {
       'isCli': msg.isCli,
       'status': msg.status.index,
       'messageId': msg.messageId,
+      'originalText': msg.originalText,
+      'translatedText': msg.translatedText,
+      'translatedLanguageCode': msg.translatedLanguageCode,
+      'translationStatus': msg.translationStatus.value,
+      'translationModelId': msg.translationModelId,
       'retryCount': msg.retryCount,
       'estimatedTimeoutMs': msg.estimatedTimeoutMs,
       'expectedAckHash': msg.expectedAckHash,
@@ -115,6 +121,13 @@ class MessageStore {
       isCli: isCli,
       status: MessageStatus.values[json['status'] as int],
       messageId: json['messageId'] as String?,
+      originalText: json['originalText'] as String?,
+      translatedText: json['translatedText'] as String?,
+      translatedLanguageCode: json['translatedLanguageCode'] as String?,
+      translationStatus: parseMessageTranslationStatus(
+        json['translationStatus'],
+      ),
+      translationModelId: json['translationModelId'] as String?,
       retryCount: json['retryCount'] as int? ?? 0,
       estimatedTimeoutMs: json['estimatedTimeoutMs'] as int?,
       expectedAckHash: json['expectedAckHash'] as int? ?? 0,