feat(ui): add GameUI class for handling game UI and player actions

- Implemented `GameUI` for managing game state transitions and player interactions.
- Integrated Slint `MainWindow` for UI rendering and event handling.

src/ui/GameUI.cpp

@@ -0,0 +1,55 @@
+/**
+ * @file GameUI.cpp
+ *
+ * @author Yuzhe Guo
+ * @date 2025.12.06
+ */
+#include "GameUI.h"
+#include "MainWindow.h"
+
+#include <utility>
+
+#include <slint.h>
+
+namespace UNO::UI {
+
+    GameUI::GameUI(std::function<void(CLIENT::PlayerAction)> callback) : callback_(std::move(callback)), window_(MainWindow::create())
+    {
+        window_->on_request_connect([this](const auto &ui_addr, const auto &ui_port, const auto &ui_name) {
+            std::string host(ui_addr);
+            uint16_t port = std::stoi(std::string(ui_port));
+            std::string name(ui_name);
+
+            CLIENT::PlayerConnectPayload payload(name, host, port);
+            this->callback_({CLIENT::PlayerActionType::CONNECT, payload});
+            this->window_->set_is_connecting(true);
+        });
+        window_->on_request_start([this]() {
+            CLIENT::PlayerStartGamePayload payload;
+            this->callback_({CLIENT::PlayerActionType::START_GAME, payload});
+            this->window_->set_is_ready(true);
+        });
+    }
+
+    void GameUI::doUpdateUI(const std::shared_ptr<const GAME::ClientGameState> &clientGameState)
+    {
+        if (clientGameState->getClientGameStage() == GAME::ClientGameStage::PENDING_CONNECTION) {
+            window_->set_active_page(PageType::ConnectPage);
+        }
+        if (clientGameState->getClientGameStage() == GAME::ClientGameStage::PRE_GAME) {
+            window_->set_active_page(PageType::StartPage);
+        }
+    }
+
+    void GameUI::updateUI(const std::shared_ptr<const GAME::ClientGameState> &clientGameState)
+    {
+        slint::invoke_from_event_loop([this, clientGameState]() { this->doUpdateUI(clientGameState); });
+    }
+
+
+    void GameUI::run()
+    {
+        window_->run();
+    }
+
+}   // namespace UNO::UI

src/ui/GameUI.h

@@ -0,0 +1,31 @@
+/**
+ * @file GameUI.h
+ *
+ * @author Yuzhe Guo
+ * @date 2025.12.06
+ */
+#pragma once
+#include "../client/PlayerAction.h"
+#include "../game/GameState.h"
+#include "MainWindow.h"
+
+#include <functional>
+#include <memory>
+
+namespace UNO::UI {
+    class GameUI {
+    private:
+        std::function<void(CLIENT::PlayerAction)> callback_;
+        slint::ComponentHandle<MainWindow> window_;
+
+        void doUpdateUI(const std::shared_ptr<const GAME::ClientGameState> &clientGameState);
+
+    public:
+        explicit GameUI(std::function<void(CLIENT::PlayerAction)> callback);
+
+        void updateUI(const std::shared_ptr<const GAME::ClientGameState> &clientGameState);
+
+        void run();
+    };
+
+}   // namespace UNO::UI