Function getFileExtension

getFileExtension(fileName: string): string
Get file extension from file name.
Parameters
- fileName: string
  File name to extract extension from
Returns string
File extension without dot, or empty string
Example
```
getFileExtension('document.pdf'); // "pdf"
getFileExtension('no-extension'); // ""
```
- Defined in file-manager/utils/fileUtils.ts:207