fix: remove with_chain_name calls and format imports after rebase

The updated base branch removed chain_name from the SignetNodeBuilder
API. Remove the now-invalid calls in node-tests and apply nightly fmt.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: prestwich

crates/host-reth/src/alias.rs

@@ -1,5 +1,8 @@
 use alloy::{consensus::constants::KECCAK_EMPTY, primitives::Address};
-use core::{fmt, future::{self, Future}};
+use core::{
+    fmt,
+    future::{self, Future},
+};
 use eyre::OptionExt;
 use reth::providers::{StateProviderBox, StateProviderFactory};
 use signet_block_processor::{AliasOracle, AliasOracleFactory};

crates/node-tests/src/context.rs

@@ -176,7 +176,6 @@ impl SignetTestContext {
             .with_notifier(decomposed.notifier)
             .with_storage(Arc::clone(&storage))
             .with_alias_oracle(Arc::clone(&alias_oracle))
-            .with_chain_name(decomposed.chain_name)
             .with_blob_cacher(blob_cacher)
             .with_serve_config(serve_config)
             .with_rpc_config(decomposed.rpc_config)

crates/node-tests/tests/db.rs

@@ -49,7 +49,6 @@ async fn test_genesis() {
         .with_notifier(decomposed.notifier)
         .with_storage(Arc::clone(&storage))
         .with_alias_oracle(Arc::clone(&alias_oracle))
-        .with_chain_name(decomposed.chain_name)
         .with_blob_cacher(blob_cacher)
         .with_serve_config(decomposed.serve_config)
         .with_rpc_config(decomposed.rpc_config)