Add Tier 2 utility commands: helm/cloak toggles, follow, and assist

Display Toggle Commands:
- Add /helm, /helmet, /showhelm to toggle helm visibility
- Add /cloak, /showcloak to toggle cloak visibility
- Track visibility state with helmVisible_ and cloakVisible_ flags
- Show confirmation messages: "Helm/Cloak is now visible/hidden"
- Use CMSG_SHOWING_HELM (0x2B9) and CMSG_SHOWING_CLOAK (0x2BA)

Follow Command:
- Add /follow and /f to follow current target
- Works with both players and NPCs
- Show "Now following [Name]" confirmation message
- Track follow target with followTargetGuid_ for future movement logic

Assist Command:
- Add /assist to target what your current target is targeting
- Read target's target from UNIT_FIELD_TARGET update fields (offset 6-7)
- Reconstruct 64-bit target GUID from two 32-bit field values
- Automatically switch your target to assist target
- Show helpful messages: "[Name] has no target" when appropriate
- Essential for combat coordination in groups

Implementation:
- Add ShowingHelmPacket and ShowingCloakPacket builders
- Add toggleHelm() and toggleCloak() methods with state management
- Add followTarget() for setting follow target
- Add assistTarget() with smart target field reading
- Use Entity::getFields() to access protected update fields
- Handle missing targets and invalid states gracefully
- All commands provide chat feedback
- Support multiple aliases for user convenience

include/game/game_handler.hpp

@@ -227,6 +227,14 @@ public:
     // Stand state
     void setStandState(uint8_t state);  // 0=stand, 1=sit, 2=sit_chair, 3=sleep, 4=sit_low_chair, 5=sit_medium_chair, 6=sit_high_chair, 7=dead, 8=kneel, 9=submerged
 
+    // Display toggles
+    void toggleHelm();
+    void toggleCloak();
+
+    // Follow/Assist
+    void followTarget();
+    void assistTarget();
+
     // ---- Phase 1: Name queries ----
     void queryPlayerName(uint64_t guid);
     void queryCreatureInfo(uint32_t entry, uint64_t guid);
@@ -626,6 +634,13 @@ private:
     // ---- Logout state ----
     bool loggingOut_ = false;
 
+    // ---- Display state ----
+    bool helmVisible_ = true;
+    bool cloakVisible_ = true;
+
+    // ---- Follow state ----
+    uint64_t followTargetGuid_ = 0;
+
     // ---- Online item tracking ----
     struct OnlineItemInfo {
         uint32_t entry = 0;

include/game/opcodes.hpp

@@ -81,6 +81,10 @@ enum class Opcode : uint16_t {
     // ---- Stand State ----
     CMSG_STAND_STATE_CHANGE          = 0x101,
 
+    // ---- Display Toggles ----
+    CMSG_SHOWING_HELM                = 0x2B9,
+    CMSG_SHOWING_CLOAK               = 0x2BA,
+
     // ---- Random Roll ----
     MSG_RANDOM_ROLL                  = 0x1FB,
 

include/game/world_packets.hpp

@@ -786,6 +786,22 @@ public:
     static network::Packet build(uint8_t state);
 };
 
+// ============================================================
+// Display Toggles
+// ============================================================
+
+/** CMSG_SHOWING_HELM packet builder */
+class ShowingHelmPacket {
+public:
+    static network::Packet build(bool show);
+};
+
+/** CMSG_SHOWING_CLOAK packet builder */
+class ShowingCloakPacket {
+public:
+    static network::Packet build(bool show);
+};
+
 // ============================================================
 // Random Roll
 // ============================================================