Fix mypy errors

Signed-off-by: Roger Barker <[email protected]>

Author: rbarker-dev

src/hiero_sdk_python/response_code.py

@@ -350,7 +350,7 @@ class ResponseCode(IntEnum):
     MAX_CUSTOM_FEES_IS_NOT_SUPPORTED = 387
 
     @classmethod
-    def _missing_(cls,value):
+    def _missing_(cls,value: int) -> "ResponseCode":
         """
         Handles cases where an integer value does not match any ResponseCode member
         and returns 'UNKNOWN_CODE_<value>'.
@@ -361,7 +361,7 @@ def _missing_(cls,value):
         return unknown
 
     @classmethod
-    def get_name(cls,code):
+    def get_name(cls,code: int) -> str:
         """
         Returns the name of the response code.
         """

src/hiero_sdk_python/transaction/transaction_record.py

@@ -24,13 +24,13 @@ class TransactionRecord:
     transfers: defaultdict[AccountId, int] = field(default_factory=lambda: defaultdict(int))
 
     def __repr__(self) -> str:
-        status = None
+        status: Optional[str] = None
         if self.receipt:
             try:
                 from hiero_sdk_python.response_code import ResponseCode
                 status = ResponseCode(self.receipt.status).name
             except (ValueError, AttributeError):
-                status = self.receipt.status
+                status = str(self.receipt.status)
         return (f"TransactionRecord(transaction_id='{self.transaction_id}', "
                 f"transaction_hash={self.transaction_hash.decode('utf-8')}, "
                 f"transaction_memo='{self.transaction_memo}', "

src/hiero_sdk_python/transaction/transaction_response.py

@@ -1,10 +1,12 @@
-from typing import Optional
+from typing import Optional, TYPE_CHECKING
 from hiero_sdk_python.account.account_id import AccountId
-from hiero_sdk_python.transaction.transaction import Transaction
 from hiero_sdk_python.transaction.transaction_id import TransactionId
 from hiero_sdk_python.transaction.transaction_receipt import TransactionReceipt
 from hiero_sdk_python.client.client import Client
 
+if TYPE_CHECKING:
+    from hiero_sdk_python.transaction.transaction import Transaction
+
 class TransactionResponse:
     """
     Represents the response from a transaction submitted to the Hedera network.
@@ -18,7 +20,7 @@ def __init__(self) -> None:
         self.node_id: AccountId = AccountId()
         self.hash: bytes = bytes()
         self.validate_status: bool = False
-        self.transaction: Optional[Transaction] = None
+        self.transaction: Optional["Transaction"] = None
 
     def get_receipt(self, client: Client) -> TransactionReceipt:
         """

src/hiero_sdk_python/transaction/transfer_transaction.py

@@ -134,21 +134,21 @@ def build_transaction_body(self) -> transaction_body_pb2.TransactionBody:
             crypto_transfer_tx_body.transfers.CopyFrom(transfer_list)
 
         # NFTs
-        for token_id, transfers in self.nft_transfers.items():
+        for token_id, nft_transfers in self.nft_transfers.items():
             token_transfer_list = basic_types_pb2.TokenTransferList(
                 token=token_id._to_proto()
             )
-            for transfer in transfers:
+            for transfer in nft_transfers:
                 token_transfer_list.nftTransfers.append(transfer._to_proto())
 
             crypto_transfer_tx_body.tokenTransfers.append(token_transfer_list)
 
         # Tokens
-        for token_id, transfers in self.token_transfers.items():
+        for token_id, token_transfers in self.token_transfers.items():
             token_transfer_list = basic_types_pb2.TokenTransferList(
                 token=token_id._to_proto()
             )
-            for account_id, amount in transfers.items():
+            for account_id, amount in token_transfers.items():
                 token_transfer_list.transfers.append(
                     basic_types_pb2.AccountAmount(
                         accountID=account_id._to_proto(),