Fix code review issues - remove unused imports, fix shutdown race condition

Co-authored-by: realcodywburns <13103499+realcodywburns@users.noreply.github.com>

Author: Copilot

src/main/scala/com/chipprbots/ethereum/console/ConsoleUI.scala

@@ -433,13 +433,13 @@ class ConsoleUI extends Logger {
     case 'd' =>
       shutdown()
       log.info("Console UI disabled, switching to standard logging")
-      true
+      false
     case _ =>
       true
   }
 
   /** Shutdown and cleanup the console UI. */
-  def shutdown(): Unit = {
+  def shutdown(): Unit = synchronized {
     terminal.foreach { term =>
       try {
         // Show cursor

src/main/scala/com/chipprbots/ethereum/console/ConsoleUIUpdater.scala

@@ -1,10 +1,5 @@
 package com.chipprbots.ethereum.console
 
-import scala.concurrent.duration._
-
-import cats.effect.IO
-import cats.effect.unsafe.implicits.global
-
 import org.apache.pekko.actor.typed.ActorRef
 import org.apache.pekko.actor.typed.ActorSystem
 
@@ -94,7 +89,7 @@ class ConsoleUIUpdater(
         }
       }
     } finally {
-      consoleUI.shutdown()
+      // Shutdown is handled in StdNode.shutdown() to avoid race conditions
     }
   }