feat: Add recent messages overlay to map in fullscreen mode and update localization for recent messages

lib/services/map_marker_service.dart

@@ -88,11 +88,16 @@ class MapMarkerService {
                     ],
                   ),
                   padding: const EdgeInsets.all(6),
-                  child: Icon(
-                    getContactMarkerIcon(contact),
-                    color: Colors.white,
-                    size: 18,
-                  ),
+                  child: contact.roleEmoji != null
+                      ? Text(
+                          contact.roleEmoji!,
+                          style: const TextStyle(fontSize: 18),
+                        )
+                      : Icon(
+                          getContactMarkerIcon(contact),
+                          color: Colors.white,
+                          size: 18,
+                        ),
                 ),
                 const SizedBox(height: 2),
                 // Name label (without emoji)

lib/services/protocol/frame_parser.dart

@@ -1,3 +1,4 @@
+import 'dart:convert';
 import 'dart:typed_data';
 import '../../models/contact.dart';
 import '../../models/message.dart';
@@ -248,7 +249,7 @@ class FrameParser {
     String? selfName;
     if (reader.hasRemaining) {
       final nameBytes = reader.readRemainingBytes();
-      selfName = String.fromCharCodes(nameBytes.takeWhile((b) => b != 0));
+      selfName = utf8.decode(nameBytes.takeWhile((b) => b != 0).toList());
     }
 
     return {