chore: clean up debug prints and register HUD/intro on event bus

- Register HudManager and a fresh IntroAnimation on the event bus
  during ZenClient bootstrap so HUDs actually tick and the intro
  plays on first launch.
- Strip leftover System.out.println debug breadcrumbs from
  NewClickGui, CategoryPanel, ModuleElement and the unused
  BUILD_TAG print in ModuleElement.
- Drop the redundant 'initialized' static flag and the stray
  NewClickGui instance constructed in the class initializer; the
  Lombok @NonNull null check on render() was already enforced, so
  the hand-written guard goes too.
- Remove the unused NumberSettingElement.sliderX field.
- Replace Module.getBind() with a Lombok @Getter on the field.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/main/java/shit/zen/ZenClient.java

@@ -11,6 +11,7 @@ import net.minecraftforge.fml.common.Mod;
 import shit.zen.event.EventBus;
 import shit.zen.event.EventTarget;
 import shit.zen.event.impl.TickEvent;
+import shit.zen.gui.IntroAnimation;
 import shit.zen.manager.CommandManager;
 import shit.zen.manager.ConfigManager;
 import shit.zen.manager.HudManager;
@@ -88,10 +89,12 @@ public class ZenClient extends ClientBase {
             this.configManager = new ConfigManager();
             this.lagManager = new LagManager();
             this.targetManager = new TargetManager();
+            this.eventBus.register(this.hudManager);
             this.eventBus.register(this.lagManager);
             this.eventBus.register(this.targetManager);
             this.eventBus.register(this);
             this.commandManager.initCommands();
+            this.eventBus.register(new IntroAnimation());
             registerPatches();
             if (PatchAgent.getInstrumentation() != null) {
                 PatchAgent.installPatchesAndRetransform();