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Fixed an issue where if the user forgot to add the .pdf extension at the end of the filename, the exported PDF file would be saved as an image file. Now, the .pdf extension is automatically added if missing.
This fix ensures that the exported PDF is saved with the correct file extension, preventing it from being mistakenly treated as an image file when the extension is omitted.
How to test:

go to -> Image -> Export As Pdf -> save the file
Try exporting without adding the .pdf extension to the filename and verify that the file is saved correctly with the .pdf extension.