feat: add warning notification when no players hear local chat

src/main/java/org/examp/john/ChatHandler.java

@@ -45,6 +45,7 @@ public class ChatHandler {
                     .append(sender.getDisplayName());
 
             if (text.startsWith(prefix)) {
+                // ГЛОБАЛЬНИЙ ЧАТ
                 String actualMessage = text.substring(1).trim();
                 Component globalMessage = Component.empty()
                         .append(formattedName)
@@ -55,15 +56,33 @@ public class ChatHandler {
                 }
 
             } else {
-                Component localMessage = Component.empty()
-                        .append(formattedName)
-                        .append(Component.literal(": " + text).withStyle(ChatFormatting.GRAY));
+                // ЛОКАЛЬНИЙ ЧАТ
+                int heardCount = 0;
 
                 for (ServerPlayer player : players) {
                     if (player.level() == serverLevel && player.distanceTo(sender) <= LOCAL_CHAT_RADIUS) {
-                        player.sendSystemMessage(localMessage);
+                        if (player != sender) {
+                            heardCount++;
+                        }
                     }
                 }
+
+                if (heardCount > 0) {
+                    Component localMessage = Component.empty()
+                            .append(formattedName)
+                            .append(Component.literal(": " + text).withStyle(ChatFormatting.GRAY));
+
+                    for (ServerPlayer player : players) {
+                        if (player.level() == serverLevel && player.distanceTo(sender) <= LOCAL_CHAT_RADIUS) {
+                            player.sendSystemMessage(localMessage);
+                        }
+                    }
+                } else {
+                    sender.sendSystemMessage(
+                            Component.literal("Вас ніхто не почув, додайте на початок повідомлення \"!\" аби написати в глобальний чат")
+                                    .withStyle(ChatFormatting.ITALIC, ChatFormatting.YELLOW)
+                    );
+                }
             }
 
             return false;