refactor: Update using statements for relocated types

Updates imports across the codebase to reference the new namespaces
for Formatting utilities, Document, BinFileSaver, and Toolbox.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Core/Bin.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
+using CutList.Core.Formatting;
 
 namespace CutList.Core
 {

CutList/Forms/ResultsForm.cs

@@ -1,10 +1,5 @@
 using CutList.Core;
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.IO;
-using System.Linq;
-using System.Windows.Forms;
+using CutList.Services;
 
 namespace CutList.Forms
 {

CutList/Helper.cs

@@ -1,6 +1,4 @@
-using CutList.Core;
-using System.Drawing;
-using System.Windows.Forms;
+using CutList.Core.Formatting;
 
 namespace CutList
 {

CutList/Models/LengthItem.cs

@@ -1,6 +1,5 @@
-using Newtonsoft.Json;
-using CutList.Core;
-using System;
+using CutList.Core.Formatting;
+using Newtonsoft.Json;
 
 namespace CutList.Models
 {

CutList/Presenters/MainFormPresenter.cs

@@ -1,10 +1,5 @@
-using CutList.Forms;
 using CutList.Models;
 using CutList.Services;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 
 namespace CutList.Presenters
 {

CutList/Services/DocumentService.cs

@@ -1,8 +1,6 @@
 using CutList.Common;
-using CutList.Forms;
+using CutList.Models;
 using Newtonsoft.Json;
-using System;
-using System.IO;
 
 namespace CutList.Services
 {