Feature: add online indicator

src/Logic/Web/IsOnline.ts

@@ -0,0 +1,19 @@
+import { Store, UIEventSource } from "../UIEventSource"
+
+export class IsOnline {
+    private static readonly _isOnline: UIEventSource<boolean> = new UIEventSource(navigator.onLine)
+    static {
+
+        window.addEventListener("online", () => {
+            IsOnline._isOnline.set(true)
+        })
+
+        window.addEventListener("offline", () => {
+            IsOnline._isOnline.set(false)
+
+        })
+    }
+
+    public static readonly isOnline: Store<boolean> = IsOnline._isOnline
+
+}

src/service-worker/SWGenerated.ts

@@ -0,0 +1,4 @@
+export class SWGenerated {
+// generated by scripts/prepareServiceWorker.ts
+static vNumber = "0.54.4"
+}