Is your feature request related to a problem? Please describe.
As .OPUS is becoming increasingly relevant and serves as a direct replacement for .MP3, its absence limits the usability of the platform for users who prefer or require .OPUS for its superior efficiency and quality.

Describe the solution you'd like
I would like Nora to implement support for the .OPUS audio codec..

Describe alternatives you've considered
An alternative solution could be continuing to convert .OPUS files to other supported formats like .MP3 or .AAC, but this results in a loss of quality and/or increased file sizes, which is not ideal. Native .OPUS support would be a much more efficient and quality-preserving option.

Additional context
Adding .OPUS support could also align Nora with modern audio standards and practices, as more devices and platforms are beginning to adopt .OPUS due to its advantages over other audio formats. This enhancement would not only improve functionality but also future-proof the platform as media standards evolve.