feat: Add UserSettings and WorkspaceManager for enhanced user preferences and layout management

- Introduced `UserSettings` class to manage user preferences and settings persistence, including loading and saving functionality.
- Added `WorkspaceManager` class to handle workspace layouts, sessions, and presets, improving user experience with layout management.
- Updated `editor_library.cmake` to include new source files for `UserSettings` and `WorkspaceManager`.

src/app/editor/ui/workspace_manager.h

@@ -0,0 +1,65 @@
+#ifndef YAZE_APP_EDITOR_UI_WORKSPACE_MANAGER_H_
+#define YAZE_APP_EDITOR_UI_WORKSPACE_MANAGER_H_
+
+#include <deque>
+#include <string>
+#include "absl/status/status.h"
+
+namespace yaze {
+class Rom;
+
+namespace editor {
+
+class EditorSet;
+class ToastManager;
+
+/**
+ * @brief Manages workspace layouts, sessions, and presets
+ */
+class WorkspaceManager {
+ public:
+  struct SessionInfo {
+    Rom* rom;
+    EditorSet* editor_set;
+    std::string custom_name;
+    std::string filepath;
+  };
+  
+  explicit WorkspaceManager(ToastManager* toast_manager)
+      : toast_manager_(toast_manager) {}
+  
+  // Layout management
+  absl::Status SaveWorkspaceLayout(const std::string& name = "");
+  absl::Status LoadWorkspaceLayout(const std::string& name = "");
+  absl::Status ResetWorkspaceLayout();
+  
+  // Preset management
+  void SaveWorkspacePreset(const std::string& name);
+  void LoadWorkspacePreset(const std::string& name);
+  void LoadDeveloperLayout();
+  void LoadDesignerLayout();
+  void LoadModderLayout();
+  
+  // Window management
+  void ShowAllWindows();
+  void HideAllWindows();
+  void MaximizeCurrentWindow();
+  void RestoreAllWindows();
+  void CloseAllFloatingWindows();
+  
+  // Session queries
+  size_t GetActiveSessionCount() const;
+  bool HasDuplicateSession(const std::string& filepath) const;
+  
+  void set_sessions(std::deque<SessionInfo>* sessions) { sessions_ = sessions; }
+  
+ private:
+  ToastManager* toast_manager_;
+  std::deque<SessionInfo>* sessions_ = nullptr;
+  std::string last_workspace_preset_;
+};
+
+}  // namespace editor
+}  // namespace yaze
+
+#endif  // YAZE_APP_EDITOR_UI_WORKSPACE_MANAGER_H_