fix: resolve add friend feature in community section

[vasheekhan]

🐛 Problem

The "Add Friend" feature in the Community section was not working correctly due to improper friendship existence handling using .single().

✅ Fix Implemented

• Replaced .single() query with proper array handling
• Fixed friend request workflow
• Prevented duplicate friend requests
• Added self-friend prevention validation
• Improved friendship error handling

🧪 Tested

• Send friend request
• Prevent duplicate requests
• Prevent self add
• Accept friend request flow

✨ Improvements

• More reliable friend request system
• Better validation handling
• Improved user experience in Community section

Closes #60

@vasheekhan

[vercel]

@vasheekhan is attempting to deploy a commit to the anirbansarkars' projects Team on Vercel.

A member of the Team first needs to authorize it.