1) Is there any specific ruling fatwa on what to do if when prayin Salah layl you go into fajr time. Sometimes I end up going 3-4 mins despite shortening the Salah

2) Can I pay Khums on general niyyat example I have many small things lying around I pay estimated Khums ? Without specificall mentioning the item ?

1- That is permissible and your Salat al-Layl is valid.

2- You don’t have to mention the specific items when paying Khums. You can estimate their overall value, and based on that pay their Khums. Just make sure that your estimate is as accurate as possible.