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/panels/ConsolePanel.h

@@ -0,0 +1,36 @@
+// Copyright 2025 Pound Emulator Project. All rights reserved.
+#pragma once
+
+#include "../Panel.h"
+#include <vector>
+#include <string>
+#include <deque>
+
+namespace Pound::GUI
+{
+
+    class ConsolePanel : public Panel
+    {
+    public:
+        ConsolePanel();
+
+        void Render() override;
+        void AddLog(const std::string &text);
+        void Clear();
+
+    private:
+        struct LogEntry
+        {
+            std::string text;
+            ImVec4 color;
+        };
+
+        std::deque<LogEntry> log_buffer;
+        bool auto_scroll = true;
+        bool show_timestamps = true;
+        static constexpr size_t MAX_LOG_ENTRIES = 1000;
+
+        ImVec4 GetLogColor(const std::string &text) const;
+    };
+
+} // namespace Pound::GUI