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/AppIcon.icon/icon.json

@@ -0,0 +1,102 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "fill" : {
+    "linear-gradient" : [
+      "display-p3:0.10645,0.27174,0.19292,1.00000",
+      "display-p3:0.00006,0.13678,0.07057,1.00000"
+    ],
+    "orientation" : {
+      "start" : {
+        "x" : 0.5,
+        "y" : 0
+      },
+      "stop" : {
+        "x" : 0.5,
+        "y" : 0.7
+      }
+    }
+  },
+  "groups" : [
+    {
+      "blur-material" : 0.5,
+      "hidden" : false,
+      "layers" : [
+        {
+          "fill" : {
+            "solid" : "display-p3:0.30163,0.65906,0.39475,1.00000"
+          },
+          "hidden" : false,
+          "image-name" : "audiobook.svg",
+          "name" : "audiobook",
+          "position" : {
+            "scale" : 1.45,
+            "translation-in-points" : [
+              -0.6150821872817005,
+              -21.261194425549093
+            ]
+          }
+        }
+      ],
+      "shadow" : {
+        "kind" : "neutral",
+        "opacity" : 0.77
+      },
+      "translucency" : {
+        "enabled" : true,
+        "value" : 0.5
+      }
+    },
+    {
+      "hidden" : true,
+      "layers" : [
+        {
+          "blend-mode" : "screen",
+          "fill" : {
+            "solid" : "display-p3:0.00169,0.78170,0.17447,1.00000"
+          },
+          "glass" : true,
+          "image-name" : "headset-.svg",
+          "name" : "headset-",
+          "opacity" : 0.33,
+          "position" : {
+            "scale" : 1.75,
+            "translation-in-points" : [
+              -0.614357187281712,
+              -63.2819525338457
+            ]
+          }
+        },
+        {
+          "blend-mode" : "screen",
+          "fill" : {
+            "solid" : "display-p3:0.31727,0.82379,0.38520,1.00000"
+          },
+          "glass" : true,
+          "image-name" : "open-book-3.svg",
+          "name" : "open-book-3",
+          "position" : {
+            "scale" : 0.75,
+            "translation-in-points" : [
+              -0.6139821872816356,
+              146.59439922330398
+            ]
+          }
+        }
+      ],
+      "shadow" : {
+        "kind" : "neutral",
+        "opacity" : 0.5
+      },
+      "translucency" : {
+        "enabled" : false,
+        "value" : 0.5
+      }
+    }
+  ],
+  "supported-platforms" : {
+    "squares" : "shared"
+  }
+}