Follow review feedback.

Author: vLuckyyy

eternalcore-core/src/main/java/com/eternalcode/core/feature/seen/SeenCommand.java

@@ -5,6 +5,7 @@
 import com.eternalcode.core.notice.NoticeService;
 import com.eternalcode.core.user.User;
 import com.eternalcode.core.util.DurationUtil;
+import com.eternalcode.core.viewer.Viewer;
 import dev.rollczi.litecommands.annotations.argument.Arg;
 import dev.rollczi.litecommands.annotations.command.Command;
 import dev.rollczi.litecommands.annotations.context.Context;
@@ -20,6 +21,7 @@
 @Permission("eternalcore.seen")
 class SeenCommand {
 
+    public static final int NEVER_JOINED_BEFORE = 0;
     private final Server server;
     private final NoticeService noticeService;
 
@@ -31,12 +33,12 @@ public SeenCommand(Server server, NoticeService noticeService) {
 
     @Execute
     @DescriptionDocs(description = "Shows when the player was last seen on the server")
-    void execute(@Context User sender, @Arg User target) {
+    void execute(@Context Viewer sender, @Arg User target) {
         OfflinePlayer targetPlayer = this.server.getOfflinePlayer(target.getUniqueId());
 
         if (targetPlayer.isOnline()) {
             this.noticeService.create()
-                .user(sender)
+                .viewer(sender)
                 .notice(translation -> translation.seen().nowOnline())
                 .placeholder("{PLAYER}", target.getName())
                 .send();
@@ -46,10 +48,9 @@ void execute(@Context User sender, @Arg User target) {
 
         long lastPlayed = targetPlayer.getLastPlayed();
 
-        // If the time is 0, it means the player has never joined before
-        if (lastPlayed == 0) {
+        if (lastPlayed == NEVER_JOINED_BEFORE) {
             this.noticeService.create()
-                .user(sender)
+                .viewer(sender)
                 .notice(translation -> translation.seen().neverPlayedBefore())
                 .placeholder("{PLAYER}", target.getName())
                 .send();
@@ -61,7 +62,7 @@ void execute(@Context User sender, @Arg User target) {
         String lastPlayedFormatted = DurationUtil.format(lastPlayedBetween, true);
 
         this.noticeService.create()
-            .user(sender)
+            .viewer(sender)
             .notice(translation -> translation.seen().lastSeen())
             .placeholder("{PLAYER}", target.getName())
             .placeholder("{SEEN}", lastPlayedFormatted)