feat: handle SMSG_PET_RENAMEABLE to auto-open pet rename dialog on first tame

When the server sends SMSG_PET_RENAMEABLE (after taming a pet for the first
time), the pet rename modal now automatically opens so the player can name
their new pet without needing to right-click the pet frame.

include/game/game_handler.hpp

@@ -718,6 +718,8 @@ public:
     void dismissPet();
     void renamePet(const std::string& newName);
     bool hasPet() const { return petGuid_ != 0; }
+    // Returns true once after SMSG_PET_RENAMEABLE; consuming the flag clears it.
+    bool consumePetRenameablePending() { bool v = petRenameablePending_; petRenameablePending_ = false; return v; }
     uint64_t getPetGuid() const { return petGuid_; }
 
     // ---- Pet state (populated by SMSG_PET_SPELLS / SMSG_PET_MODE) ----
@@ -2747,6 +2749,7 @@ private:
     uint32_t petActionSlots_[10] = {};   // SMSG_PET_SPELLS action bar (10 slots)
     uint8_t  petCommand_ = 1;            // 0=stay,1=follow,2=attack,3=dismiss
     uint8_t  petReact_   = 1;            // 0=passive,1=defensive,2=aggressive
+    bool     petRenameablePending_ = false;  // set by SMSG_PET_RENAMEABLE, consumed by UI
     std::vector<uint32_t> petSpellList_; // known pet spells
     std::unordered_set<uint32_t> petAutocastSpells_;  // spells with autocast on
 

src/game/game_handler.cpp

@@ -7661,10 +7661,14 @@ void GameHandler::handlePacket(network::Packet& packet) {
         case Opcode::SMSG_PET_DISMISS_SOUND:
         case Opcode::SMSG_PET_ACTION_SOUND:
         case Opcode::SMSG_PET_UNLEARN_CONFIRM:
-        case Opcode::SMSG_PET_RENAMEABLE:
         case Opcode::SMSG_PET_UPDATE_COMBO_POINTS:
             packet.setReadPos(packet.getSize());
             break;
+        case Opcode::SMSG_PET_RENAMEABLE:
+            // Server signals that the pet can now be named (first tame)
+            petRenameablePending_ = true;
+            packet.setReadPos(packet.getSize());
+            break;
         case Opcode::SMSG_PET_NAME_INVALID:
             addUIError("That pet name is invalid. Please choose a different name.");
             addSystemChatMessage("That pet name is invalid. Please choose a different name.");

src/ui/game_screen.cpp

@@ -629,6 +629,12 @@ void GameScreen::render(game::GameHandler& gameHandler) {
         renderPetFrame(gameHandler);
     }
 
+    // Auto-open pet rename modal when server signals the pet is renameable (first tame)
+    if (gameHandler.consumePetRenameablePending()) {
+        petRenameOpen_ = true;
+        petRenameBuf_[0] = '\0';
+    }
+
     // Totem frame (Shaman only, when any totem is active)
     if (gameHandler.getPlayerClass() == 7) {
         renderTotemFrame(gameHandler);