feat(attributes/ui): toast "LEVEL UP!" no HUD via S_LEVEL_UP delegate

- UZMMOHudWidget ganha LevelUpToastContainer (BindWidgetOptional UWidget)
  e LevelUpToastText (BindWidgetOptional UTextBlock) — both Collapsed por
  default; HandleLevelUp os mostra com text "LEVEL UP!  Lv N" e dispara
  timer FTimerHandle pra esconder após LevelUpToastDurationSec (2.5s).
- WBP_HUD: Border escuro semi-transparente (R=0.05,G=0.04,B=0.10,A=0.85)
  com TextBlock dourado (R=1.0,G=0.85,B=0.30) fonte 32, slot top-center
  com padding top=120, visibility default Collapsed.
- Snapshot pós-level-up (vem logo após S_LEVEL_UP) atualiza HP/SP/level via
  HpSpBar automaticamente — toast é só feedback visual instantâneo.

Polish futuro (não desta frente): SFX cue + particle aura dourada +
animação de fade in/out via UMG.

Source/ZMMO/Game/UI/InGame/ZMMOHudWidget.cpp

@@ -1,9 +1,12 @@
 #include "ZMMOHudWidget.h"
 
+#include "Components/TextBlock.h"
+#include "Components/Widget.h"
 #include "CommonInputTypeEnum.h"  // ECommonInputMode
 #include "Engine/World.h"
 #include "GameFramework/PlayerController.h"
 #include "GameFramework/PlayerState.h"
+#include "TimerManager.h"
 #include "ZMMO.h"
 #include "ZMMOAttributeComponent.h"
 #include "ZMMOHudHpSpWidget.h"
@@ -32,6 +35,8 @@ void UZMMOHudWidget::NativeOnActivated()
 	// HUD nao intercepta cliques — mouse passa direto pro Pawn (camera, etc.).
 	// Sub-widgets que precisam de click (futuro: hotkeys) podem override.
 	SetVisibility(ESlateVisibility::HitTestInvisible);
+	// Toast comeca escondido — so' aparece em HandleLevelUp.
+	HideLevelUpToast();
 	BindToLocalPlayer();
 	UE_LOG(LogZMMO, Log, TEXT("ZMMOHudWidget activated (HpSpBar=%s)"),
 		HpSpBar ? *HpSpBar->GetName() : TEXT("none"));
@@ -115,8 +120,39 @@ void UZMMOHudWidget::HandleHpSpChanged(int32 Hp, int32 Sp)
 
 void UZMMOHudWidget::HandleLevelUp(int32 NewBaseLevel, int32 StatusPointDelta)
 {
-	// Snapshot subsequente do AttributeSystem vai disparar HandleAttributesChanged
-	// e atualizar HpSpBar->LevelText. Aqui e' o ponto pra efeitos visuais
-	// instantaneos (toast "LEVEL UP", confetti, sound). V1 noop — UI pode
-	// hook via Blueprint depois.
+	// Snapshot subsequente atualiza HpSpBar (level/maxhp/maxsp). Aqui mostra
+	// toast visual instantaneo. StatusPointDelta nao usado no texto (UI mostra
+	// no StatusWindow). Polish futuro: SFX + particle aura.
+	UE_LOG(LogZMMO, Log, TEXT("[HUD] LEVEL UP! newLevel=%d +sp=%d"), NewBaseLevel, StatusPointDelta);
+	ShowLevelUpToast(NewBaseLevel);
+}
+
+void UZMMOHudWidget::ShowLevelUpToast(int32 NewBaseLevel)
+{
+	if (LevelUpToastText)
+	{
+		LevelUpToastText->SetText(FText::FromString(
+			FString::Printf(TEXT("LEVEL UP!  Lv %d"), NewBaseLevel)));
+	}
+	if (LevelUpToastContainer)
+	{
+		LevelUpToastContainer->SetVisibility(ESlateVisibility::HitTestInvisible);
+	}
+
+	// Cancela timer anterior (caso level up duplo em sequencia) + agenda hide.
+	if (UWorld* World = GetWorld())
+	{
+		World->GetTimerManager().ClearTimer(LevelUpToastHideTimer);
+		World->GetTimerManager().SetTimer(LevelUpToastHideTimer,
+			FTimerDelegate::CreateUObject(this, &UZMMOHudWidget::HideLevelUpToast),
+			LevelUpToastDurationSec, /*loop*/ false);
+	}
+}
+
+void UZMMOHudWidget::HideLevelUpToast()
+{
+	if (LevelUpToastContainer)
+	{
+		LevelUpToastContainer->SetVisibility(ESlateVisibility::Collapsed);
+	}
 }

Source/ZMMO/Game/UI/InGame/ZMMOHudWidget.h

@@ -2,9 +2,12 @@
 
 #include "CommonActivatableWidget.h"
 #include "CoreMinimal.h"
+#include "Engine/TimerHandle.h"
 #include "ZMMOAttributeTypes.h"
 #include "ZMMOHudWidget.generated.h"
 
+class UTextBlock;
+class UWidget;
 class UZMMOAttributeComponent;
 class UZMMOHudHpSpWidget;
 
@@ -71,6 +74,22 @@ protected:
 	UPROPERTY(BlueprintReadOnly, meta = (BindWidgetOptional), Category = "Zeus|HUD")
 	UZMMOHudHpSpWidget* HpSpBar = nullptr;
 
+	/// Container do toast "LEVEL UP!" (Fase 3). Hidden por default; em
+	/// `HandleLevelUp` vira visivel por `LevelUpToastDurationSec` segundos
+	/// (ver `Show/HideLevelUpToast`). WBP_HUD coloca um Border + Image + TextBlock
+	/// dentro deste container; este C++ controla apenas o lifecycle visivel/hidden.
+	UPROPERTY(BlueprintReadOnly, meta = (BindWidgetOptional), Category = "Zeus|HUD|LevelUp")
+	UWidget* LevelUpToastContainer = nullptr;
+
+	/// Texto exibido no toast — formato "LEVEL UP!  Lv X" (X = novo level).
+	/// Tambem BindWidgetOptional; WBP_HUD pode usar texto estatico no design.
+	UPROPERTY(BlueprintReadOnly, meta = (BindWidgetOptional), Category = "Zeus|HUD|LevelUp")
+	UTextBlock* LevelUpToastText = nullptr;
+
+	/// Duracao do toast em segundos. Configuravel no BP filho.
+	UPROPERTY(EditDefaultsOnly, Category = "Zeus|HUD|LevelUp")
+	float LevelUpToastDurationSec = 2.5f;
+
 	// === Futuros sub-widgets ===
 	// UPROPERTY(BlueprintReadOnly, meta = (BindWidgetOptional)) UZMMOHudPlayerInfoWidget* PlayerInfo = nullptr;
 	// UPROPERTY(BlueprintReadOnly, meta = (BindWidgetOptional)) UZMMOHudMinimapWidget* Minimap = nullptr;
@@ -99,4 +118,9 @@ private:
 
 	UPROPERTY(Transient)
 	TWeakObjectPtr<UZMMOAttributeComponent> BoundComponent;
+
+	void ShowLevelUpToast(int32 NewBaseLevel);
+	void HideLevelUpToast();
+
+	FTimerHandle LevelUpToastHideTimer;
 };