Add ability to add alt text retroactively

[alimony]

Is your feature request related to a problem? Please describe.

Once posted, you cannot add alt text to pictures or edit the existing one.

Describe the solution you'd like

It would be nice if alt text could be added or edited retroactively.

Original idea here: https://staging.bsky.app/profile/ruben.codes/post/3jvsx5anwad26

[Selduro]

This would also allow for bots to add an AI generated image description directly to the original post instead of having to download the pictures and answering with the described pictures like https://bsky.app/profile/alttext.bsky.social does for example.

I'd really like that

[Wilker-uwu]

i would appreciate a feature where others can contribute to the alt text in a way that the creator of the original post can approve, in posts where alt text is often missing.

this feature is specially helpful for people who posts a ton of images but none of which with alt text. in those cases i assume it would help more people start writing those texts on their own when posting new images