refactor(editor): reorganize includes and enhance EditorManager initialization

- Moved the declaration of `AgentControlServer` to a forward declaration in the header file for better clarity and organization.
- Updated the `EditorManager` constructor to initialize the version string and popup manager context.
- Added conditional compilation for gRPC-related includes and commented out the agent control server initialization for future reference.
- Ensured consistent definition of `IMGUI_DEFINE_MATH_OPERATORS` across multiple files to prevent potential issues with ImGui usage.

Benefits:
- Improved code organization and readability.
- Enhanced maintainability by clarifying the initialization process and managing includes effectively.

src/app/editor/ui/menu_builder.h

@@ -5,6 +5,11 @@
 #include <string>
 #include <vector>
 
+// Must define before including imgui.h
+#ifndef IMGUI_DEFINE_MATH_OPERATORS
+#define IMGUI_DEFINE_MATH_OPERATORS
+#endif
+
 #include "app/gui/icons.h"
 #include "imgui/imgui.h"