limit large video uploads

[dnbrwstr]

Summary

Add a 150 MB video limit and apply it across the in-app picker, share intents, and the iOS share extension. This also tightens video detection for sparse media picker assets, surfaces attach failures to the user, and keeps share-extension uploads from failing just because thumbnail generation fails.

Fixes TLON-5793

Changes

• Add shared video validation copy for too-large, unreadable, and unsupported videos
• Treat sparse media picker video assets as videos before validating them
• Show share intent attach errors in the channel UI
• Stop the iOS share extension from copying oversized videos and keep sharing usable when thumbnail generation fails
• Regenerate the expo-share-intent patch so clean native generation keeps the ShareViewController changes

How did I test?

Tested on device

[linear]

TLON-5793

[claude]

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[dnbrwstr]

Large diff in this fie is because it wasn't regenerated after the update to 5.1.1. This should have no effect in practice -- it just gets us to a generated ShareViewController which matches the one we've actually been using.

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[patosullivan]

Lgtm

[arthyn]

makes sense to limit for share extension and memex, but I really think we shouldn't limit uploads where we can, like in web generally or in file picker on mobile. we should probably let self-hosters upload w/e size up to the S3 single request cap ~5gb.

[dnbrwstr]

makes sense to limit for share extension and memex, but I really think we shouldn't limit uploads where we can, like in web generally or in file picker on mobile. we should probably let self-hosters upload w/e size up to the S3 single request cap ~5gb.

I removed the limitation on web. Agree it would be nicer not to cap, but on mobile right now the experience is not great + pretty prone to failure.