feat: implement CMSG_PET_RENAME with rename dialog in pet frame

- Add PetRenamePacket::build(petGuid, name, isDeclined) builder
- Add GameHandler::renamePet(newName) — sends packet via petGuid_
- Add 'Rename Pet' to pet frame context menu (right-click pet name)
- Modal input dialog with 12-char limit matches server validation

src/game/game_handler.cpp

@@ -14655,6 +14655,14 @@ void GameHandler::dismissPet() {
     socket->send(packet);
 }
 
+void GameHandler::renamePet(const std::string& newName) {
+    if (petGuid_ == 0 || state != WorldState::IN_WORLD || !socket) return;
+    if (newName.empty() || newName.size() > 12) return;  // Server enforces max 12 chars
+    auto packet = PetRenamePacket::build(petGuid_, newName, 0);
+    socket->send(packet);
+    LOG_INFO("Sent CMSG_PET_RENAME: petGuid=0x", std::hex, petGuid_, std::dec, " name='", newName, "'");
+}
+
 void GameHandler::requestStabledPetList() {
     if (state != WorldState::IN_WORLD || !socket || stableMasterGuid_ == 0) return;
     auto pkt = ListStabledPetsPacket::build(stableMasterGuid_);

src/game/world_packets.cpp

@@ -5421,5 +5421,13 @@ network::Packet UnstablePetPacket::build(uint64_t stableMasterGuid, uint32_t pet
     return p;
 }
 
+network::Packet PetRenamePacket::build(uint64_t petGuid, const std::string& name, uint8_t isDeclined) {
+    network::Packet p(wireOpcode(Opcode::CMSG_PET_RENAME));
+    p.writeUInt64(petGuid);
+    p.writeString(name);    // null-terminated
+    p.writeUInt8(isDeclined);
+    return p;
+}
+
 } // namespace game
 } // namespace wowee

src/ui/game_screen.cpp

@@ -3030,11 +3030,41 @@ void GameScreen::renderPetFrame(game::GameHandler& gameHandler) {
             if (ImGui::MenuItem("Target Pet")) {
                 gameHandler.setTarget(petGuid);
             }
+            if (ImGui::MenuItem("Rename Pet")) {
+                ImGui::CloseCurrentPopup();
+                petRenameOpen_ = true;
+                petRenameBuf_[0] = '\0';
+            }
             if (ImGui::MenuItem("Dismiss Pet")) {
                 gameHandler.dismissPet();
             }
             ImGui::EndPopup();
         }
+        // Pet rename modal (opened via context menu)
+        if (petRenameOpen_) {
+            ImGui::OpenPopup("Rename Pet###PetRename");
+            petRenameOpen_ = false;
+        }
+        if (ImGui::BeginPopupModal("Rename Pet###PetRename", nullptr,
+                                   ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse)) {
+            ImGui::Text("Enter new pet name (max 12 characters):");
+            ImGui::SetNextItemWidth(180.0f);
+            bool submitted = ImGui::InputText("##PetRenameInput", petRenameBuf_, sizeof(petRenameBuf_),
+                                              ImGuiInputTextFlags_EnterReturnsTrue);
+            ImGui::SameLine();
+            if (ImGui::Button("OK") || submitted) {
+                std::string newName(petRenameBuf_);
+                if (!newName.empty() && newName.size() <= 12) {
+                    gameHandler.renamePet(newName);
+                }
+                ImGui::CloseCurrentPopup();
+            }
+            ImGui::SameLine();
+            if (ImGui::Button("Cancel")) {
+                ImGui::CloseCurrentPopup();
+            }
+            ImGui::EndPopup();
+        }
         ImGui::PopStyleColor();
         if (petLevel > 0) {
             ImGui::SameLine();