Fix profile save file not working

SwiftUI only supports one fileExporter modifier per view hierarchy.
When multiple fileExporter modifiers are attached, only the last one
takes effect. Unified ProfileExportDocument and ProfileJSONExportDocument
into a single ProfileAnyExportDocument to use one fileExporter for both
file types.

Library/Database/Profile+Transferable.swift

@@ -115,7 +115,7 @@ public struct TypedProfile: Transferable, Codable {
 }
 
 public extension UTType {
-    static var profile: UTType { .init(exportedAs: AppConfiguration.profileUTType) }
+    static let profile = UTType(exportedAs: AppConfiguration.profileUTType)
 }
 
 #if !os(tvOS)
@@ -177,4 +177,37 @@ public extension UTType {
             return FileWrapper(regularFileWithContents: data)
         }
     }
+
+    public struct ProfileAnyExportDocument: FileDocument {
+        public static var readableContentTypes: [UTType] { [.data, .json] }
+
+        public let data: Data
+        public let filename: String
+        public let contentType: UTType
+
+        public init(profile: ProfileExportDocument) {
+            data = profile.data
+            filename = profile.filename
+            contentType = .data
+        }
+
+        public init(json: ProfileJSONExportDocument) {
+            data = json.content.data(using: .utf8) ?? Data()
+            filename = json.filename
+            contentType = .json
+        }
+
+        public init(configuration: ReadConfiguration) throws {
+            guard let data = configuration.file.regularFileContents else {
+                throw CocoaError(.fileReadCorruptFile)
+            }
+            self.data = data
+            filename = "profile"
+            contentType = .data
+        }
+
+        public func fileWrapper(configuration _: WriteConfiguration) throws -> FileWrapper {
+            FileWrapper(regularFileWithContents: data)
+        }
+    }
 #endif