chore: address PR feedback

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

Author: Dosik13

src/hiero_sdk_python/system/freeze_transaction.py

@@ -11,6 +11,7 @@
 from hiero_sdk_python.hapi.services.schedulable_transaction_body_pb2 import (
     SchedulableTransactionBody,
 )
+from hiero_sdk_python.hapi.services.transaction_pb2 import TransactionBody
 from hiero_sdk_python.system.freeze_type import FreezeType
 from hiero_sdk_python.timestamp import Timestamp
 from hiero_sdk_python.transaction.transaction import Transaction
@@ -119,7 +120,7 @@ def _build_proto_body(self) -> FreezeTransactionBody:
             freeze_type=self.freeze_type._to_proto() if self.freeze_type else None,
         )
 
-    def build_transaction_body(self):
+    def build_transaction_body(self) -> TransactionBody:
         """
         Builds the transaction body for this freeze transaction.
 

src/hiero_sdk_python/system/freeze_type.py

@@ -28,7 +28,7 @@ class FreezeType(Enum):
     TELEMETRY_UPGRADE = 5
 
     @staticmethod
-    def _from_proto(proto_obj: proto_FreezeType):
+    def _from_proto(proto_obj: proto_FreezeType) -> "FreezeType":
         """
         Converts a protobuf FreezeType to a FreezeType enum.
         
@@ -72,8 +72,9 @@ def _to_proto(self) -> proto_FreezeType:
             return proto_FreezeType.TELEMETRY_UPGRADE
         return proto_FreezeType.UNKNOWN_FREEZE_TYPE
 
-    def __eq__(self, other):
+    def __eq__(self, other: object) -> bool:
         if isinstance(other, FreezeType):
             return self.value == other.value
         elif isinstance(other, int):
             return self.value == other
+        return False