feat: add persistent combat log window (/combatlog or /cl)

Stores up to 500 combat events in a rolling deque alongside the existing
floating combat text. Events are populated via the existing addCombatText()
call site, resolving attacker/target names from the entity manager and
player name cache at event time.

- CombatLogEntry struct in spell_defines.hpp (type, amount, spellId,
  isPlayerSource, timestamp, sourceName, targetName)
- getCombatLog() / clearCombatLog() accessors on GameHandler
- renderCombatLog() in GameScreen: scrollable two-column table (Time +
  Event), color-coded by event category, with Damage/Healing/Misc filter
  checkboxes, auto-scroll toggle, and Clear button
- /combatlog (/cl) chat command toggles the window

include/game/game_handler.hpp

@@ -536,6 +536,10 @@ public:
     const std::vector<CombatTextEntry>& getCombatText() const { return combatText; }
     void updateCombatText(float deltaTime);
 
+    // Combat log (persistent rolling history, max MAX_COMBAT_LOG entries)
+    const std::deque<CombatLogEntry>& getCombatLog() const { return combatLog_; }
+    void clearCombatLog() { combatLog_.clear(); }
+
     // Threat
     struct ThreatEntry {
         uint64_t victimGuid = 0;
@@ -2149,6 +2153,8 @@ private:
     float autoAttackFacingSyncTimer_ = 0.0f; // Periodic facing sync while meleeing
     std::unordered_set<uint64_t> hostileAttackers_;
     std::vector<CombatTextEntry> combatText;
+    static constexpr size_t MAX_COMBAT_LOG = 500;
+    std::deque<CombatLogEntry> combatLog_;
     // unitGuid → sorted threat list (descending by threat value)
     std::unordered_map<uint64_t, std::vector<ThreatEntry>> threatLists_;
 

include/game/spell_defines.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdint>
+#include <ctime>
 #include <string>
 #include <vector>
 
@@ -63,6 +64,19 @@ struct CombatTextEntry {
     bool isExpired() const { return age >= LIFETIME; }
 };
 
+/**
+ * Persistent combat log entry (stored in a rolling deque, survives beyond floating-text lifetime)
+ */
+struct CombatLogEntry {
+    CombatTextEntry::Type type = CombatTextEntry::MELEE_DAMAGE;
+    int32_t  amount       = 0;
+    uint32_t spellId      = 0;
+    bool     isPlayerSource = false;
+    time_t   timestamp    = 0;   // Wall-clock time (std::time(nullptr))
+    std::string sourceName;      // Resolved display name of attacker/caster
+    std::string targetName;      // Resolved display name of victim/target
+};
+
 /**
  * Spell cooldown entry received from server
  */

include/ui/game_screen.hpp

@@ -400,6 +400,10 @@ private:
     bool  showWhoWindow_ = false;
     void  renderWhoWindow(game::GameHandler& gameHandler);
 
+    // Combat Log window
+    bool  showCombatLog_ = false;
+    void  renderCombatLog(game::GameHandler& gameHandler);
+
     // Instance Lockouts window
     bool  showInstanceLockouts_ = false;