refactor(clear_signing): renamed variables for code comprehension

### core/src/apps/ethereum/clear_signing.py
@@ -1149,27 +1149,33 @@ async def request_definitions(
 
 
 async def _find_display_format(
-    func_sig: bytes, address_bytes: bytes, msg: MsgInSignTx, nested: bool = False
+    func_sig: bytes, contract_address: bytes, msg: MsgInSignTx, nested: bool = False
 ) -> DisplayFormat | None:
-    """Find a display format for calling `func_sig` on the `address_bytes`
+    """Find a display format for calling `func_sig` on the `contract_address`
     contract, trying built-ins, then the definitions provided in the initial
     request, then a definition request over the wire."""
 
     from .clear_signing_definitions import all_display_formats
 
-    for f in all_display_formats():
-        if f.matches_call(func_sig, msg.chain_id, address_bytes):
-            return f
+    for display_format in all_display_formats():
+        if display_format.matches_call(func_sig, msg.chain_id, contract_address):
+            return display_format
 
     if not nested and msg.definitions and msg.definitions.encoded_display_format:
-        f = DisplayFormat.from_encoded(msg.definitions.encoded_display_format)
-        if f.matches_call(func_sig, msg.chain_id, address_bytes):
-            return f
+        display_format = DisplayFormat.from_encoded(
+            msg.definitions.encoded_display_format
+        )
+        if display_format.matches_call(func_sig, msg.chain_id, contract_address):
+            return display_format
 
     if msg.supports_definition_request:
-        _, f = await request_definitions(msg.chain_id, address_bytes, func_sig)
-        if f is not None and f.matches_call(func_sig, msg.chain_id, address_bytes):
-            return f
+        _, display_format = await request_definitions(
+            msg.chain_id, contract_address, func_sig
+        )
+        if display_format is not None and display_format.matches_call(
+            func_sig, msg.chain_id, contract_address
+        ):
+            return display_format
 
     return None
 
@@ -1325,7 +1331,7 @@ def raw_rows() -> list[DisplayedField]:
 
 async def try_confirm(
     data: AnyBytes,
-    address_bytes: bytes,
+    contract_address: bytes,
     msg: MsgInSignTx,
     defs: Definitions,
     maximum_fee: str,
@@ -1337,15 +1343,15 @@ async def try_confirm(
         TRANSFER_DISPLAY_FORMAT,
     )
 
-    if not address_bytes:
+    if not contract_address:
         return False
 
     if len(data) < SC_FUNC_SIG_BYTES:
         return False
 
-    func_sig = bytes(data[0:SC_FUNC_SIG_BYTES])
+    func_sig = bytes(data[:SC_FUNC_SIG_BYTES])
 
-    display_format = await _find_display_format(func_sig, address_bytes, msg)
+    display_format = await _find_display_format(func_sig, contract_address, msg)
     if display_format is None:
         return False
 
@@ -1362,7 +1368,7 @@ async def try_confirm(
         await _handle_approve(
             calldata,
             display_format,
-            address_bytes,
+            contract_address,
             msg,
             defs,
             maximum_fee,
@@ -1372,7 +1378,7 @@ async def try_confirm(
         await _handle_transfer(
             calldata,
             display_format,
-            address_bytes,
+            contract_address,
             msg,
             defs,
             maximum_fee,
@@ -1394,7 +1400,7 @@ async def try_confirm(
 async def _handle_approve(
     calldata: memoryview,
     display_format: DisplayFormat,
-    address_bytes: bytes,
+    contract_address: bytes,
     msg: MsgInSignTx,
     defs: Definitions,
     maximum_fee: str,
@@ -1457,8 +1463,8 @@ async def _handle_approve(
         fee_items,
         msg.chain_id,
         defs.network,
-        actual_token or defs.get_token(address_bytes),
-        address_bytes,
+        actual_token or defs.get_token(contract_address),
+        contract_address,
         is_revoke,
         bool(msg.chunkify),
         native_amount=native_amount,
@@ -1468,7 +1474,7 @@ async def _handle_approve(
 async def _handle_transfer(
     calldata: memoryview,
     display_format: DisplayFormat,
-    address_bytes: bytes,
+    contract_address: bytes,
     msg: MsgInSignTx,
     defs: Definitions,
     maximum_fee: str,
@@ -1521,18 +1527,18 @@ async def _handle_transfer(
             fee_items,
             msg.chain_id,
             defs.network,
-            actual_token or defs.get_token(address_bytes),
-            address_from_bytes(address_bytes, defs.network),
+            actual_token or defs.get_token(contract_address),
+            address_from_bytes(contract_address, defs.network),
         )
     else:
         await require_confirm_tx(
             recipient_addr,
             value,
-            address_bytes,
+            contract_address,
             msg.address_n,
             maximum_fee,
             fee_items,
-            actual_token or defs.get_token(address_bytes),
+            actual_token or defs.get_token(contract_address),
             is_send=True,
             chunkify=bool(msg.chunkify),
             native_amount=native_amount,