Replace FormattingHelpers with FormatStyle-based Formatters

- Add modern FormatStyle properties to Formatters enum (dateFormat, dateTimeFormat, fileSizeFormat)
- Replace FormattingHelpers static methods with Swift's modern .formatted() API
- Update and rename FormattingHelpersTests to FormattersTests
- Remove deprecated FormattingHelpers utility class

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: leogdion

Packages/BushelKit/Sources/BushelFoundation/Formatters.swift

@@ -97,4 +97,18 @@ public enum Formatters {
       return dateFormatter
     }()
   #endif
+
+  // MARK: - Modern FormatStyle Properties
+
+  /// A date format style for displaying dates (e.g., "Jan 15, 2025")
+  /// Equivalent to FormattingHelpers.formatDate()
+  public static let dateFormat: Date.FormatStyle = .init(date: .abbreviated, time: .omitted)
+
+  /// A date format style for displaying dates with time (e.g., "Jan 15, 2025 at 3:45 PM")
+  /// Equivalent to FormattingHelpers.formatDateTime()
+  public static let dateTimeFormat: Date.FormatStyle = .init(date: .abbreviated, time: .shortened)
+
+  /// A byte count format style for displaying file sizes (e.g., "1.23 GB")
+  /// Equivalent to FormattingHelpers.formatFileSize()
+  public static let fileSizeFormat: ByteCountFormatStyle = .init(style: .file)
 }

Packages/BushelKit/Sources/BushelUtilities/FormattingHelpers.swift

@@ -1,5 +1,5 @@
 //
-//  FormattingHelpersTests.swift
+//  FormattersTests.swift
 //  BushelKit
 //
 //  Created by Leo Dion.
@@ -29,12 +29,12 @@
 
 import XCTest
 
-@testable import BushelUtilities
+@testable import BushelFoundation
 
-internal final class FormattingHelpersTests: XCTestCase {
+internal final class FormattersTests: XCTestCase {
   internal func testFormatDate() {
     let date = Date(timeIntervalSince1970: 1_700_000_000)
-    let formatted = FormattingHelpers.formatDate(date)
+    let formatted = date.formatted(Formatters.dateFormat)
 
     // Should return medium date format
     XCTAssertFalse(formatted.isEmpty)
@@ -43,7 +43,7 @@ internal final class FormattingHelpersTests: XCTestCase {
 
   internal func testFormatDateTime() {
     let date = Date(timeIntervalSince1970: 1_700_000_000)
-    let formatted = FormattingHelpers.formatDateTime(date)
+    let formatted = date.formatted(Formatters.dateTimeFormat)
 
     // Should include both date and time
     XCTAssertFalse(formatted.isEmpty)
@@ -53,36 +53,36 @@ internal final class FormattingHelpersTests: XCTestCase {
 
   internal func testFormatFileSizeGB() {
     let bytes = 2_500_000_000  // 2.5 GB
-    let formatted = FormattingHelpers.formatFileSize(bytes)
+    let formatted = bytes.formatted(Formatters.fileSizeFormat)
 
     XCTAssertEqual(formatted, "2.50 GB")
   }
 
   internal func testFormatFileSizeMB() {
     let bytes = 500_000_000  // 500 MB
-    let formatted = FormattingHelpers.formatFileSize(bytes)
+    let formatted = bytes.formatted(Formatters.fileSizeFormat)
 
     XCTAssertEqual(formatted, "500 MB")
   }
 
   internal func testFormatFileSizeSmallMB() {
     let bytes = 50_000_000  // 50 MB
-    let formatted = FormattingHelpers.formatFileSize(bytes)
+    let formatted = bytes.formatted(Formatters.fileSizeFormat)
 
     XCTAssertEqual(formatted, "50 MB")
   }
 
   internal func testFormatFileSizeLargeGB() {
     let bytes = 15_000_000_000  // 15 GB
-    let formatted = FormattingHelpers.formatFileSize(bytes)
+    let formatted = bytes.formatted(Formatters.fileSizeFormat)
 
     XCTAssertEqual(formatted, "15.00 GB")
   }
 
   internal func testFormatFileSizeBoundary() {
     // Exactly 1 GB
     let bytes = 1_000_000_000
-    let formatted = FormattingHelpers.formatFileSize(bytes)
+    let formatted = bytes.formatted(Formatters.fileSizeFormat)
 
     XCTAssertEqual(formatted, "1.00 GB")
   }