Also since you said you coded it, depending on what server you used the code might already be saved on it so that should make it easier to redo it.

First thing you should do is contact your partner and let them know. Then after you need to contact your teacher for an extension, maybe attach photos of the broken project so it's believable. Mistakes happen, don't beat yourself up for this. Just make sure you have enough time to redo it and please let your partner know since this is also their grade too.

I think it's time to visit a doctor. I don't mean it in a rude way but seriously, forgetting stuff like that isn't a normal thing. Does this happen all the time?