chore: type fixes account

Signed-off-by: exploreriii <[email protected]>

Author: exploreriii

src/hiero_sdk_python/account/account_balance.py

@@ -1,4 +1,4 @@
-from typing import Union, Dict
+from typing import Dict
 
 from hiero_sdk_python.tokens.token_id import TokenId
 from hiero_sdk_python.hbar import Hbar
@@ -42,7 +42,7 @@ def _from_proto(cls, proto: CryptoGetAccountBalanceResponse) -> "AccountBalance"
         if proto.tokenBalances:
             for token_balance in proto.tokenBalances:
                 token_id: TokenId = TokenId._from_proto(token_balance.tokenId)
-                balance: Union[Hbar,int] = token_balance.balance
+                balance: int = token_balance.balance
                 token_balances[token_id] = balance
 
         return cls(hbars=hbars, token_balances=token_balances)

src/hiero_sdk_python/account/account_create_transaction.py

@@ -103,7 +103,7 @@ def set_auto_renew_period(self, seconds: Union[int,Duration]) -> "AccountCreateT
             self.auto_renew_period = seconds
         else:
             raise TypeError("Duration of invalid type")
-
+        return self
 
     def set_account_memo(self, memo: str) -> "AccountCreateTransaction":
         """