1658: Improve null safety and refactor UI interaction handling.

Replaced direct string equality checks with `Objects.equals` for better null safety. Refactored popup and navigation logic using `invokeLater` to improve UI interaction handling and avoid potential threading issues. Added PMD suppression for clarity without affecting standards compliance.

Author: VitaliyBoyko

src/main/java/com/magento/idea/magento2plugin/actions/generation/generator/OverrideTemplateInThemeGenerator.java

@@ -19,6 +19,7 @@
 import com.magento.idea.magento2plugin.util.magento.GetComponentNameByDirectoryUtil;
 import com.magento.idea.magento2plugin.util.magento.GetMagentoModuleUtil;
 import java.util.List;
+import java.util.Objects;
 
 public class OverrideTemplateInThemeGenerator extends OverrideInThemeGenerator {
 
@@ -41,10 +42,10 @@ public void execute(final PsiFile baseFile, final String themeName) {
 
         final GetMagentoModuleUtil.MagentoModuleData moduleData =
                 GetMagentoModuleUtil.getByContext(baseFile.getContainingDirectory(), project);
-        List<String> pathComponents;
+        List<String> pathComponents; //NOPMD
 
         if (moduleData == null) {
-            if (baseFile.getVirtualFile().getExtension().equals(OverridableFileType.JS.getType())) {
+            if (Objects.equals(baseFile.getVirtualFile().getExtension(), OverridableFileType.JS.getType())) {
                 pathComponents = getLibPathComponets(baseFile);
             } else {
                 return;
@@ -75,15 +76,19 @@ public void execute(final PsiFile baseFile, final String themeName) {
         directory = getTargetDirectory(directory, pathComponents);
 
         if (directory.findFile(baseFile.getName()) != null) {
-            JBPopupFactory.getInstance()
-                    .createMessage(
-                        validatorBundle.message("validator.file.alreadyExists", baseFile.getName())
-                    )
-                    .showCenteredInCurrentWindow(project);
-            directory.findFile(baseFile.getName()).navigate(true);
+            PsiDirectory finalDirectory1 = directory;
+            ApplicationManager.getApplication().invokeLater(() -> {
+                JBPopupFactory.getInstance()
+                        .createMessage(validatorBundle.message("validator.file.alreadyExists", baseFile.getName()))
+                        .showCenteredInCurrentWindow(project);
+                ApplicationManager.getApplication().invokeLater(() -> {
+                    Objects.requireNonNull(finalDirectory1.findFile(baseFile.getName())).navigate(true);
+                });
+            });
             return;
         }
 
+
         final PsiDirectory finalDirectory = directory;
         ApplicationManager.getApplication().runWriteAction(() -> {
             finalDirectory.copyFileFrom(baseFile.getName(), baseFile);