Fix import/export subscriptions

Beta 6 has changed the way import and export works. It's changed from
a environment variable to view modifier now.

Multiplatform/iOS/Settings/FeedsSettingsModel.swift

@@ -9,6 +9,7 @@
 import Foundation
 import SwiftUI
 import Account
+import UniformTypeIdentifiers
 
 enum FeedsSettingsError: LocalizedError, Equatable {
 	case none, noActiveAccount, exportFailed(reason: String?), importFailed
@@ -51,6 +52,11 @@ class FeedsSettingsModel: ObservableObject {
 		}
 	}
 	@Published var showError: Bool = false
+	@Published var isImporting: Bool = false
+	@Published var isExporting: Bool = false
+	@Published var selectedAccount: Account? = nil
+
+	let importingContentTypes: [UTType] = [UTType(filenameExtension: "opml"), UTType("public.xml")].compactMap { $0 }
 
 	func checkForActiveAccount() -> Bool {
 		if AccountManager.shared.activeAccounts.count == 0 {
@@ -60,7 +66,18 @@ class FeedsSettingsModel: ObservableObject {
 		return true
 	}
 
-	func generateExportURL(for account: Account) -> URL? {
+	func importOPML(account: Account?) {
+		selectedAccount = account
+		isImporting = true
+	}
+
+	func exportOPML(account: Account?) {
+		selectedAccount = account
+		isExporting = true
+	}
+
+	func generateExportURL() -> URL? {
+		guard let account = selectedAccount else { return nil }
 		let accountName = account.nameForDisplay.replacingOccurrences(of: " ", with: "").trimmingCharacters(in: .whitespaces)
 		let filename = "Subscriptions-\(accountName).opml"
 		let tempFile = FileManager.default.temporaryDirectory.appendingPathComponent(filename)
@@ -75,9 +92,9 @@ class FeedsSettingsModel: ObservableObject {
 		return tempFile
 	}
 
-	func processImportedFiles(_ urls: [URL],_ account: Account?) {
+	func processImportedFiles(_ urls: [URL]) {
 		urls.forEach{
-			account?.importOPML($0, completion: { [weak self] result in
+			selectedAccount?.importOPML($0, completion: { [weak self] result in
 				switch result {
 				case .success:
 					break