feat(gui): Extract and modularize GUI system from main.cpp

- Create modular GUI architecture with base Panel class
- Implement GUIManager to handle window lifecycle and panel management
- Add Window wrapper class for SDL3/OpenGL context management
- Create specialized panels:
  - ConsolePanel: Colored log output with timestamps
  - CPUPanel: CPU debugging with tabs for registers, memory, and disassembly
  - PerformancePanel: Real-time FPS and frame time monitoring
- Apply modern dark theme with purple accents
- Add comprehensive menu bar (File, Emulation, View, Tools, Help)
- Update CMakeLists.txt to include new gui/ directory structure
- Refactor main.cpp to use the new GUI system
- Cutom theme on switch colors

gui/Window.cpp

@@ -0,0 +1,97 @@
+// Copyright 2025 Pound Emulator Project. All rights reserved.
+
+#include "Window.h"
+#include "Base/Logging/Log.h"
+#include <imgui.h>
+#include <imgui_impl_sdl3.h>
+#include <imgui_impl_opengl3.h>
+
+namespace Pound::GUI
+{
+
+    Window::Window() = default;
+
+    Window::~Window()
+    {
+        Shutdown();
+    }
+
+    bool Window::Initialize(const std::string &title, int width, int height)
+    {
+        if (!SDL_Init(SDL_INIT_VIDEO))
+        {
+            LOG_ERROR(Render, "Error while creating SDL3 Context!");
+            return false;
+        }
+
+        SDL_PropertiesID props = SDL_CreateProperties();
+        SDL_SetStringProperty(props, SDL_PROP_WINDOW_CREATE_TITLE_STRING, title.c_str());
+        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_X_NUMBER, SDL_WINDOWPOS_CENTERED);
+        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_Y_NUMBER, SDL_WINDOWPOS_CENTERED);
+        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_WIDTH_NUMBER, width);
+        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_HEIGHT_NUMBER, height);
+        SDL_SetNumberProperty(props, "flags", SDL_WINDOW_OPENGL);
+        SDL_SetBooleanProperty(props, SDL_PROP_WINDOW_CREATE_RESIZABLE_BOOLEAN, true);
+        SDL_SetBooleanProperty(props, SDL_PROP_WINDOW_CREATE_OPENGL_BOOLEAN, true);
+
+        window = SDL_CreateWindowWithProperties(props);
+        SDL_DestroyProperties(props);
+
+        if (!window)
+        {
+            LOG_ERROR(Render, "Failed to create SDL window: {}", SDL_GetError());
+            return false;
+        }
+
+        SDL_SetWindowMinimumSize(window, 640, 480);
+
+        gl_context = SDL_GL_CreateContext(window);
+        if (!gl_context)
+        {
+            LOG_ERROR(Render, "Failed to create OpenGL context: {}", SDL_GetError());
+            return false;
+        }
+
+        SDL_GL_MakeCurrent(window, gl_context);
+        SDL_GL_SetSwapInterval(1);
+
+        return true;
+    }
+
+    void Window::Shutdown()
+    {
+        if (gl_context)
+        {
+            SDL_GL_DestroyContext(gl_context);
+            gl_context = nullptr;
+        }
+
+        if (window)
+        {
+            SDL_DestroyWindow(window);
+            window = nullptr;
+        }
+
+        SDL_Quit();
+    }
+
+    void Window::ProcessEvents()
+    {
+        SDL_Event event;
+        while (SDL_PollEvent(&event))
+        {
+            ImGui_ImplSDL3_ProcessEvent(&event);
+
+            if (event.type == SDL_EVENT_QUIT)
+            {
+                should_close = true;
+            }
+        }
+    }
+
+    void Window::SwapBuffers()
+    {
+        SDL_GL_SwapWindow(window);
+    }
+
+} // namespace Pound::GUI