Enhance download notifications and settings; add support for live activities

- Updated notification body to use proper German quotation marks for download failure alerts.
- Refactored audio interruption handling in PlayerEngine to utilize MainActor.assumeIsolated for better performance.
- Introduced nonisolated properties for support and downloads directories in ProgressSyncManager.
- Improved FullHistoryView and MainView with additional toolbar items and alerts for download failures.
- Added new toggles in SettingsView for parallel downloads and mobile data usage.
- Created new color assets for the DownloadWidgetExtension and updated widget appearance.
- Implemented Info.plist for DownloadWidgetExtension to support widget functionality.
- Enabled live activities support in iOS Info.plist.

ABS Client/Audiobookshelf swift/Views/FullHistoryView.swift

@@ -63,6 +63,13 @@ struct FullHistoryView: View {
                     Button(String(localized: "settings.done")) { dismiss() }
                 }
             }
+            #else
+            .toolbar {
+                ToolbarItem(placement: .confirmationAction) {
+                    Button(String(localized: "settings.done")) { dismiss() }
+                        .keyboardShortcut(.cancelAction)
+                }
+            }
             #endif
             .overlay {
                 if app.history.entries.isEmpty {
@@ -77,6 +84,8 @@ struct FullHistoryView: View {
         #if os(iOS)
         .presentationDetents([.medium, .large])
         .presentationDragIndicator(.visible)
+        #else
+        .frame(minWidth: 480, minHeight: 560)
         #endif
     }
 

ABS Client/Audiobookshelf swift/Views/MainView.swift

@@ -116,6 +116,21 @@ struct MainView: View {
                 FullHistoryView()
                     .environment(app)
             }
+            #if os(iOS)
+            .alert(
+                "Download fehlgeschlagen",
+                isPresented: Binding(
+                    get: { app.downloads.downloadFailureAlertTitle != nil },
+                    set: { if !$0 { app.downloads.downloadFailureAlertTitle = nil } }
+                )
+            ) {
+                Button("OK") { app.downloads.downloadFailureAlertTitle = nil }
+            } message: {
+                if let title = app.downloads.downloadFailureAlertTitle {
+                    Text("\u{201E}\(title)\u{201C} konnte nicht heruntergeladen werden.")
+                }
+            }
+            #endif
     }
 
     @ViewBuilder

ABS Client/Audiobookshelf swift/Views/SettingsView.swift

@@ -10,6 +10,8 @@ struct SettingsView: View {
     @AppStorage("libraryLayout") private var layoutRaw: String = LibraryLayout.grid.rawValue
     @AppStorage("autoRefreshOnLaunch") private var autoRefreshOnLaunch: Bool = true
     @AppStorage("historyEnabled") private var historyEnabled: Bool = false
+    @AppStorage("downloadsParallel") private var downloadsParallel: Bool = true
+    @AppStorage("downloadsOverMobile") private var downloadsOverMobile: Bool = true
 
     @State private var showLogoutConfirm: Bool = false
     @State private var showHistoryDisableConfirm: Bool = false
@@ -226,10 +228,12 @@ struct SettingsView: View {
                 Text("\(app.downloads.downloadedItems.count) Einträge")
                     .foregroundStyle(.secondary)
             }
+            Toggle("Parallel herunterladen", isOn: $downloadsParallel)
+            Toggle("Download über Mobilnetz erlauben", isOn: $downloadsOverMobile)
         } header: {
             Text("Downloads")
         } footer: {
-            Text("Heruntergeladene Hörbücher und Folgen können einzeln über das Kontextmenü gelöscht werden.")
+            Text("Parallel lädt alle Tracks eines Hörbuchs gleichzeitig — schneller, aber höhere Server- und Netzlast. Bei deaktiviertem Mobilnetz starten Downloads erst wenn WLAN verfügbar ist.")
         }
     }
 
@@ -346,8 +350,13 @@ struct SettingsView: View {
 
     private var aboutPane: some View {
         Form {
-            LabeledContent("Version", value: appVersion)
-            LabeledContent("Heruntergeladen", value: "\(app.downloads.downloadedItems.count) Einträge")
+            Section("Downloads") {
+                Toggle("Parallel herunterladen", isOn: $downloadsParallel)
+                LabeledContent("Heruntergeladen", value: "\(app.downloads.downloadedItems.count) Einträge")
+            }
+            Section("Über") {
+                LabeledContent("Version", value: appVersion)
+            }
         }
         .formStyle(.grouped)
     }