refactor(editor): enhance UI management and debugging tools

- Updated EditorManager to streamline UI component rendering, ensuring that UI elements like the Command Palette and Global Search are properly displayed.
- Refactored MenuOrchestrator to introduce a new Debug menu, consolidating debugging tools and enhancing accessibility for users.
- Improved PopupManager to include new popups for feature flags and data integrity checks, providing better feedback and control over debugging processes.

Benefits:
- Enhances user experience by organizing UI elements and debugging tools more effectively.
- Improves maintainability by centralizing UI management and debugging functionalities within dedicated components.

src/app/editor/editor_manager.cc

@@ -915,6 +915,12 @@ absl::Status EditorManager::Update() {
     session_coordinator_->DrawSessionRenameDialog();
   }
 
+  // Draw UICoordinator UI components (Command Palette, Global Search, etc.)
+  // CRITICAL: This must be called for Command Palette and other UI windows to appear
+  if (ui_coordinator_) {
+    ui_coordinator_->DrawAllUI();
+  }
+
   return absl::OkStatus();
 }
 
@@ -1053,10 +1059,8 @@ void EditorManager::DrawMenuBar() {
   // Agent chat history popup (left side)
   agent_chat_history_popup_.Draw();
 
-  // Welcome screen (managed by UICoordinator)
-  if (ui_coordinator_) {
-    ui_coordinator_->DrawWelcomeScreen();
-  }
+  // Welcome screen is now drawn by UICoordinator::DrawAllUI()
+  // Removed duplicate call to avoid showing welcome screen twice
 
   // TODO: Fix emulator not appearing
   if (show_emulator_) {
@@ -1319,12 +1323,9 @@ void EditorManager::DrawMenuBar() {
     ImGui::End();
   }
 
-  // Draw new workspace UI elements
+  // Layout presets UI (session dialogs are drawn by SessionCoordinator at lines 907-915)
   if (ui_coordinator_) {
-    ui_coordinator_->DrawSessionSwitcher();
-    ui_coordinator_->DrawSessionManager();
     ui_coordinator_->DrawLayoutPresets();
-    ui_coordinator_->DrawSessionRenameDialog();
   }
 }