refactor(editor): streamline ImGui card management across various editors

- Refactored multiple editor classes to ensure that ImGui::End() is always called after ImGui::Begin(), enhancing state management and preventing potential rendering issues.
- Updated the DungeonEditor, GraphicsEditor, ScreenEditor, MessageEditor, MusicEditor, and SpriteEditor to follow this pattern, improving code consistency and reliability.

Benefits:
- Improves the stability of the editor UI by ensuring proper handling of ImGui state.
- Enhances code readability and maintainability by standardizing the usage of ImGui functions across different editor components.

src/app/editor/music/music_editor.cc

@@ -48,20 +48,20 @@ absl::Status MusicEditor::Update() {
   // Music Tracker Card
   if (tracker_card.Begin(card_manager.GetVisibilityFlag("music.tracker"))) {
     DrawTrackerView();
-    tracker_card.End();
   }
+  tracker_card.End();
   
   // Instrument Editor Card
   if (instrument_card.Begin(card_manager.GetVisibilityFlag("music.instrument_editor"))) {
     DrawInstrumentEditor();
-    instrument_card.End();
   }
+  instrument_card.End();
   
   // Assembly View Card
   if (assembly_card.Begin(card_manager.GetVisibilityFlag("music.assembly"))) {
     assembly_editor_.InlineUpdate();
-    assembly_card.End();
   }
+  assembly_card.End();
 
   return absl::OkStatus();
 }