Better selecting to attach file

[SawatKia]

selecting to attach file.

• improve selecting a file to add. by using only the arrow and the enter to select which folder to enter and file selecting. since now when in deep level(2-3 level), it can't find any folder. currently, I have to paste the relative manually.
• add only selected lines

indexing

• use the indexing algorithm in the attached file. maybe only find the relevant part. before sending to the API. to reduce the number of tokens usage.

Thank you in advance.