Ogg: Don't drop audio when the setup header ends mid-page

[trougnouf]

This solves #729 : silent complete data loss when modifying an OGG file whose last header packet (setup header) ends mid-page (experienced in currant prior to trougnouf/currant@7b61784 )

This fix rewrites the writer at page granularity rather than packet granularity.

Verified against the reproduction from #729

Developed with AI assistance (Qwen 3.8 Q4)

[trougnouf]

Hi @Serial-ATA ,
I don't mean to be pushy but I'm surprised by your lack of response here. You are aware that this bug causes complete loss of any affected OGG file touched by your library, right? This is obviously unacceptable and the worst thing a metadata-handling library could possibly do.

[Serial-ATA]

Yes, I'm no stranger to corruption bugs. I understand the severity of the issue and it'll definitely be fixed in 0.25.5. Until then I recommend you just depend on your fork.

Please do recognize that I'm the only person maintaining this project. I only look into issues when time and motivation both permit.

[trougnouf]

Yes I understand. It's been 2 weeks without a response and I noticed some activity so I thought it may have fallen through. Glad you are on it and thanks for your work.
On my end I just went with not trusting the metadata writer and checking the resulting file s.t. it can't happen again in currant, it's worth the latency.