Support larger audio uploads / auto-convert to reduce upload size (currently capped at 250MB WAV)

[truetype74]

Problem

The current upload limit for audio files is 250MB, but this cap seems tuned for uncompressed WAV files. In practice, most real-world source audio doesn't come from WAV — it comes from meeting recordings (Google Meet, Zoom, etc.) exported as M4A or MP3, which vary a lot in length and file size depending on the call duration and codec settings.

Longer meetings/calls in WAV format hit the 250MB ceiling quickly, even when the same audio in M4A or MP3 would be a fraction of the size and still perfectly usable for transcription/processing.

Request

Could you consider one (or both) of the following?

1. Raise the upload size limit (or make it configurable), so longer WAV files aren't blocked.
2. Add automatic client-side or server-side conversion/compression (e.g. downmix/transcode incoming WAV to a compressed format like M4A/MP3/Opus before the size check, or simply accept larger files and transcode internally) so users aren't forced to manually convert files before uploading.

Either option would make it much easier to use the tool with recordings exported from common meeting platforms, which are rarely already in a small WAV file.

Additional context

Happy to test a fix/PR if pointed in the right direction. Thanks for the great tool!