Challenge: SOL Transfer Form

Build the validation and transaction construction logic for a SOL transfer form.

Requirements

• Create a function that validates a transfer request and constructs the transaction
• Accept senderPublicKey (PublicKey), recipientAddress (string), amountInSol (number), and connection (Connection)
• Validate:
  1. Recipient address is a valid PublicKey (use try/catch)
  2. Amount is positive and non-zero
  3. Sender has sufficient balance (check with connection.getBalance())
• If validation fails, return { success: false, error: string }
• If validation passes, construct a Transaction with SystemProgram.transfer and return { success: true, transaction: Transaction }