fix(Core/Player): Fix potion cooldown not ticking after combat ends (#25135)

Co-authored-by: blinkysc <blinkysc@users.noreply.github.com>
Co-authored-by: Treeston <treeston.mmoc@gmail.com>

src/server/game/Entities/Player/Player.h

@@ -1826,6 +1826,7 @@ public:
     uint32 GetLastPotionId() { return m_lastPotionId; }
     void SetLastPotionId(uint32 item_id) { m_lastPotionId = item_id; }
     void UpdatePotionCooldown(Spell* spell = nullptr);
+    void AtExitCombat() override;
 
     void setResurrectRequestData(ObjectGuid guid, uint32 mapId, float X, float Y, float Z, uint32 health, uint32 mana)
     {

src/server/game/Entities/Player/PlayerUpdates.cpp

@@ -1545,6 +1545,16 @@ void Player::UpdatePvP(bool state, bool _override)
     sScriptMgr->OnPlayerPVPFlagChange(this, state);
 }
 
+void Player::AtExitCombat()
+{
+    Unit::AtExitCombat();
+    UpdatePotionCooldown();
+
+    if (IsClass(CLASS_DEATH_KNIGHT, CLASS_CONTEXT_ABILITY))
+        for (uint8 i = 0; i < MAX_RUNES; ++i)
+            SetGracePeriod(i, 0);
+}
+
 void Player::UpdatePotionCooldown(Spell* spell)
 {
     // no potion used i combat or still in combat