Refactor EditorContext and system managers for improved clarity and consistency

src/app/editor/editor.h

@@ -20,11 +20,11 @@ namespace app {
 namespace editor {
 
 struct EditorContext {
-  static ConstantManager constant_manager;
+  ConstantManager constant_manager;
-  static CommandManager command_manager;
+  CommandManager command_manager;
-  static ExtensionManager extension_manager;
+  ExtensionManager extension_manager;
-  static HistoryManager history_manager;
+  HistoryManager history_manager;
-  static ResourceManager resource_manager;
+  ResourceManager resource_manager;
 };
 
 enum class EditorType {
@@ -52,7 +52,7 @@ constexpr std::array<const char *, 10> kEditorNames = {
  * Provides basic editing operations that each editor should implement.
  */
 class Editor {
-public:
+ public:
   Editor() = default;
   virtual ~Editor() = default;
 
@@ -69,7 +69,7 @@ public:
 
   EditorType type() const { return type_; }
 
-protected:
+ protected:
   EditorType type_;
   EditorContext context_;
 };

src/app/editor/system/command_manager.h

@@ -15,6 +15,9 @@ ImGuiKey MapKeyToImGuiKey(char key);
 
 class CommandManager {
 public:
+  CommandManager() = default;
+  ~CommandManager() = default;
+  
   using Command = std::function<void()>;
 
   struct CommandInfo {

src/app/editor/system/resource_manager.h

@@ -10,8 +10,8 @@ namespace editor {
 // System resource manager.
 class ResourceManager {
  public:
-  ResourceManager();
+  ResourceManager() : count_(0) {}
-  ~ResourceManager();
+  ~ResourceManager() = default;
 
   void Load(const char* path);
   void Unload(const char* path);