feat: MeshCore SAR - Flutter BLE mesh radio companion app

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/utils/message_extensions.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/widgets.dart';
+import '../models/message.dart';
+import '../l10n/app_localizations.dart';
+
+/// Extension for Message to provide localized delivery status
+extension MessageLocalization on Message {
+  /// Get localized delivery status text
+  String getLocalizedDeliveryStatus(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+
+    // For channel messages, show echo count instead of delivery status
+    if (isChannelMessage && deliveryStatus == MessageDeliveryStatus.sent) {
+      if (echoCount == 0) {
+        return l10n.broadcast; // "Broadcast (no echoes yet)"
+      } else if (echoCount == 1) {
+        return 'Rebroadcast by 1 node';
+      } else {
+        return 'Rebroadcast by $echoCount nodes';
+      }
+    }
+
+    switch (deliveryStatus) {
+      case MessageDeliveryStatus.sending:
+        return l10n.sending;
+      case MessageDeliveryStatus.sent:
+        return l10n.sent;
+      case MessageDeliveryStatus.delivered:
+        if (roundTripTimeMs != null) {
+          return l10n.deliveredWithTime(roundTripTimeMs!);
+        }
+        return l10n.delivered;
+      case MessageDeliveryStatus.failed:
+        return l10n.failed;
+      case MessageDeliveryStatus.received:
+        return '';
+    }
+  }
+
+  /// Get localized time ago string
+  String getLocalizedTimeAgo(BuildContext context) {
+    final diff = DateTime.now().difference(sentAt);
+    final l10n = AppLocalizations.of(context)!;
+
+    if (diff.inMinutes < 1) return l10n.justNow;
+    if (diff.inMinutes < 60) return l10n.minutesAgo(diff.inMinutes);
+    if (diff.inHours < 24) return l10n.hoursAgo(diff.inHours);
+    return l10n.daysAgo(diff.inDays);
+  }
+}