fix: Linux compat — conditional CryptoKit import + long line

- Add swift-crypto as explicit PVPrimitives dependency so `import Crypto`
  works on Linux (CryptoKit is Apple-only; SHA256 API is identical)
- Guard import with `#if canImport(CryptoKit)` in RomFileProviderVirtualPath.swift
- Split overlong switch case in FileProviderItem.contentType (>200 chars)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: github-actions[bot]

Extensions/ROM File Provider/FileProviderItem.swift

@@ -266,7 +266,10 @@ final class FileProviderItem: NSObject, NSFileProviderItem {
 
     var contentType: UTType {
         switch kind {
-        case .root, .categoryFolder, .systemFolder, .publisherFolder, .publisherAllGamesFolder, .publisherSystemFolder, .yearFolder, .regionFolder, .ratingFolder, .saveStateGameFolder, .screenshotGameFolder:
+        case .root, .categoryFolder, .systemFolder,
+             .publisherFolder, .publisherAllGamesFolder, .publisherSystemFolder,
+             .yearFolder, .regionFolder, .ratingFolder,
+             .saveStateGameFolder, .screenshotGameFolder:
             return .folder
         case .gameFile(let game, let romURL), .symlinkToGame(let game, let romURL, _, _, _):
             let ext = romURL?.pathExtension ?? ""

PVPrimitives/Package.resolved

@@ -32,13 +32,19 @@ let package = Package(
         .package(
             name: "PVHashing",
             path: "../PVHashing"
-        )
+        ),
+        .package(url: "https://github.com/apple/swift-crypto.git", from: "3.0.0")
     ],
 
     targets: [
         .target(
             name: "PVPrimitives",
-            dependencies: ["PVSupport", "PVLogging", "PVHashing"]
+            dependencies: [
+                "PVSupport",
+                "PVLogging",
+                "PVHashing",
+                .product(name: "Crypto", package: "swift-crypto")
+            ]
         ),
         // MARK: ------------ Systems ------------
         .target(

PVPrimitives/Package.swift

@@ -5,7 +5,11 @@
 //  Identifier strings and encoding for the ROM File Provider virtual hierarchy.
 //
 
+#if canImport(CryptoKit)
 import CryptoKit
+#else
+import Crypto
+#endif
 import Foundation
 
 /// Root category folders under the file provider root (each maps to a stable `NSFileProviderItemIdentifier` raw value).