Bugfix/fix Import activities with a file ending in capital letters fails (#4588) :

- Added fileExtension const to extract extension and lowercase it
- Replaced "file.name.endsWith('{.ext}')" check with "fileExtension === '{ext}'"

apps/client/src/app/pages/portfolio/activities/import-activities-dialog/import-activities-dialog.component.ts

@@ -247,9 +247,10 @@ export class ImportActivitiesDialog implements OnDestroy {
 
     reader.onload = async (readerEvent) => {
       const fileContent = readerEvent.target.result as string;
+      const fileExtension = file.name.split('.').pop()?.toLowerCase();
 
       try {
-        if (file.name.endsWith('.json')) {
+        if (fileExtension === 'json') {
           const content = JSON.parse(fileContent);
 
           this.accounts = content.accounts;
@@ -294,7 +295,7 @@ export class ImportActivitiesDialog implements OnDestroy {
           }
 
           return;
-        } else if (file.name.endsWith('.csv')) {
+        } else if (fileExtension === 'csv') {
           const content = fileContent.split('\n').slice(1);
 
           try {