Replace FormattingHelpers with FormatStyle-based Formatters

- Update DataSourceMetadata+CloudKit to use Formatters.dateTimeFormat
- Update XcodeVersionRecord+CloudKit to use Formatters.dateFormat and fileSizeFormat
- Update RestoreImageRecord+CloudKit (no FormattingHelpers usage)
- Update SwiftVersionRecord+CloudKit (no FormattingHelpers usage)

Fixes compilation errors after FormattingHelpers was removed in commit 991a95a.
All 137 BushelCloud tests pass successfully.

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

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

Author: leogdion

Sources/BushelCloudKit/Extensions/DataSourceMetadata+CloudKit.swift

@@ -83,7 +83,7 @@ extension DataSourceMetadata: CloudKitRecord {
     let lastFetchedAt = recordInfo.fields["lastFetchedAt"]?.dateValue
     let recordCount = recordInfo.fields["recordCount"]?.intValue ?? 0
 
-    let dateStr = lastFetchedAt.map { FormattingHelpers.formatDateTime($0) } ?? "Unknown"
+    let dateStr = lastFetchedAt.map { $0.formatted(Formatters.dateTimeFormat) } ?? "Unknown"
 
     var output = "\n  \(sourceName) → \(recordTypeName)\n"
     output += "    Last fetched: \(dateStr) | Records: \(recordCount)"

Sources/BushelCloudKit/Extensions/RestoreImageRecord+CloudKit.swift

@@ -104,7 +104,7 @@ extension RestoreImageRecord: @retroactive CloudKitRecord {
 
     let signedStr = signed ? "✅ Signed" : "❌ Unsigned"
     let prereleaseStr = prerelease ? "[Beta/RC]" : ""
-    let sizeStr = FormattingHelpers.formatFileSize(size)
+    let sizeStr = size.formatted(Formatters.fileSizeFormat)
 
     var output = "    \(build) \(prereleaseStr)\n"
     output += "      \(signedStr) | Size: \(sizeStr) | Source: \(source)"

Sources/BushelCloudKit/Extensions/SwiftVersionRecord+CloudKit.swift

@@ -76,7 +76,7 @@ extension SwiftVersionRecord: @retroactive CloudKitRecord {
     let version = recordInfo.fields["version"]?.stringValue ?? "Unknown"
     let releaseDate = recordInfo.fields["releaseDate"]?.dateValue
 
-    let dateStr = releaseDate.map { FormattingHelpers.formatDate($0) } ?? "Unknown"
+    let dateStr = releaseDate.map { $0.formatted(Formatters.dateFormat) } ?? "Unknown"
 
     var output = "\n  Swift \(version)\n"
     output += "    Released: \(dateStr)"

Sources/BushelCloudKit/Extensions/XcodeVersionRecord+CloudKit.swift

@@ -109,8 +109,8 @@ extension XcodeVersionRecord: @retroactive CloudKitRecord {
     let releaseDate = recordInfo.fields["releaseDate"]?.dateValue
     let size = recordInfo.fields["fileSize"]?.intValue ?? 0
 
-    let dateStr = releaseDate.map { FormattingHelpers.formatDate($0) } ?? "Unknown"
-    let sizeStr = FormattingHelpers.formatFileSize(size)
+    let dateStr = releaseDate.map { $0.formatted(Formatters.dateFormat) } ?? "Unknown"
+    let sizeStr = size.formatted(Formatters.fileSizeFormat)
 
     var output = "\n  \(version) (Build \(build))\n"
     output += "    Released: \(dateStr) | Size: \(sizeStr)"