fix(ocr): make file extension check case-insensitive

[chnateag]

Problem

When processing files with uppercase extensions (e.g., .PDF), the strict comparison $originalFileExtension !== self::PDF_FILE_EXTENSION evaluates to true. As a result, the application treats the PDF file as a non-PDF file and appends .pdf to the filename, creating unwanted duplicate files like filename.PDF.pdf.

Solution

Used strtolower() on $originalFileExtension in determineNewFilePath() (lib/Service/OcrService.php) to make the extension check case-insensitive.

Testing

Tested on a production Nextcloud instance processing files with .PDF extensions. The OCR process now overwrites the original file directly without creating .PDF.pdf duplicates.

[R0Wi]

Thanks @chnateag! Would you mind adding a unit test testcase for this?

[chnateag]

Hi @R0Wi , hope it's done properly

[R0Wi]

Easy. Looks good thanks 🙏

Will try to get the CI running again. That's not your fault, I will take care of it and merge afterwards