fix: remove 5 unused variables across 4 user/credentials files

- PasswordReset.tsx: remove unused result variable
- UserProfile.tsx: remove unused Key import and err variable
- version-check-modal.tsx: remove unused setVersionDismissed setter
- CredentialsManager.tsx: remove unused e parameter from handleDragLeave

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/ui/Desktop/Apps/Credentials/CredentialsManager.tsx

@@ -308,7 +308,7 @@ export function CredentialsManager({
     setDragOverFolder(folderName);
   };
 
-  const handleDragLeave = (e: React.DragEvent) => {
+  const handleDragLeave = () => {
     dragCounter.current--;
     if (dragCounter.current === 0) {
       setDragOverFolder(null);