Lazy-load tunnel logs in Diagnostics

Fixes #743

Passepartout/Library/Sources/AppUI/Views/Diagnostics/DiagnosticsView.swift

@@ -50,7 +50,8 @@ struct DiagnosticsView: View {
     @AppStorage(AppPreference.logsPrivateData.key, store: .appGroup)
     private var logsPrivateData = false
 
-    var availableTunnelLogs: () -> [LogEntry] = {
+    var availableTunnelLogs: () async -> [LogEntry] = {
+        await Task.detached {
             PassepartoutConfiguration.shared.availableLogs(at: BundleConfiguration.urlForTunnelLog)
                 .sorted {
                     $0.key > $1.key
@@ -58,6 +59,7 @@ struct DiagnosticsView: View {
                 .map {
                     LogEntry(date: $0, url: $1)
                 }
+        }.value
     }
 
     @State
@@ -81,8 +83,8 @@ struct DiagnosticsView: View {
                 reportIssueSection
             }
         }
-        .onLoad {
-            tunnelLogs = availableTunnelLogs()
+        .task {
+            tunnelLogs = await availableTunnelLogs()
         }
         .themeForm()
         .navigationTitle(Strings.Views.Diagnostics.title)