feat: Implement DownDash ability and related systems

- Added DownDash ability with cooldown and speed configuration.
- Introduced DownDashState to handle down dashing mechanics, including gravity manipulation and animation playback.
- Updated PlayerMovement to support DownDash functionality.
- Enhanced PlayerStats to manage spring charge consumption and healing.
- Modified PlayerCombat and WeaponHitBoxInstance to support new hit confirmation events.
- Updated AbilityType to include new form types for character abilities.
- Improved Gizmos for better visualization of enemy detection and attack ranges.
- Added feedback systems for form switching in PlayerFeedback and IFeedbackPlayer.
- Refactored combat and movement states to accommodate new abilities and ensure smooth transitions.

Assets/_Game/Scripts/Player/States/AttackState.cs

@@ -112,7 +112,10 @@ namespace BaseGames.Player.States
             var   animState = Anim.Play(step.clip);
             animState.Speed *= spd;                          // 在 ClipTransition 自身速度基础上叠加攻速
 
+            // 每次重播同一 ClipTransition 会复用同一 AnimancerState，
+            // 必须先清除旧事件再注册新事件，否则回调会累积叠加。
             var events = animState.Events(this);
+            events.Clear();
             events.OnEnd = OnClipEnd;
 
             // HitBox 时间窗口（capture step by value for closure safety）
@@ -121,11 +124,24 @@ namespace BaseGames.Player.States
                 Owner.Combat?.EnableWeaponHitBox(AttackDirection.Ground,
                     capturedStep.hitBoxId, capturedStep.damageSource));
             events.Add(capturedStep.hitBoxExit, () => Owner.Combat?.DisableAllWeaponHitBoxes());
+
             // 连击输入窗口
             if (capturedStep.comboInputOpen > 0f)
-                events.Add(capturedStep.comboInputOpen, () => _comboWindowOpen = true);
+            {
+                events.Add(capturedStep.comboInputOpen, () =>
+                {
+                    _comboWindowOpen = true;
+                    // 窗口刚开时，补检查 InputBuffer——玩家可能在窗口前就提前按键
+                    if (!_comboInputPending && Buffer.ConsumeAttack())
+                        _comboInputPending = true;
+                });
+            }
             else
-                _comboWindowOpen = true;  // 0 = 立即开放
+            {
+                _comboWindowOpen = true;
+                if (!_comboInputPending && Buffer.ConsumeAttack())
+                    _comboInputPending = true;
+            }
 
             if (capturedStep.comboInputClose > 0f)
                 events.Add(capturedStep.comboInputClose, () => _comboWindowOpen = false);
@@ -141,11 +157,18 @@ namespace BaseGames.Player.States
             _comboWindowOpen = false;
             Move.SetCancelWindowOpen(false);
 
-            // 如果已有缓存输入，直接推进（零延迟连击）
+            // 有缓存连击输入且还不是最后一段 → 零延迟推进到下一段
             if (_comboInputPending)
             {
-                AdvanceCombo();
-                return;
+                _comboInputPending = false;
+                int maxCombo = Owner.Weapon?.ActiveWeapon?.GroundComboCount ?? 1;
+                if (_comboIndex < maxCombo - 1)
+                {
+                    _comboIndex++;
+                    PlayAttackClip();
+                    return;  // 新动画已开始，不进入等待阶段
+                }
+                // 已是最后一段：消耗掉多余输入，继续进入等待阶段（不 return）
             }
 
             // 进入动画后等待阶段
@@ -169,7 +192,7 @@ namespace BaseGames.Player.States
             }
             else
             {
-                // 已是最后一段，忽略多余输入，等待超时
+                // 已是最后一段，忽略多余输入，等待超时回 Idle
                 _comboInputPending = false;
             }
         }