Added a connection status in case the connection to database fails.

Scripts/ConnectionStatus.js

@@ -0,0 +1,61 @@
+const GardenApiHost = "api.srhtnin.garden";
+let GardenConnectionMessageShown = false;
+
+function ShowGardenConnectionMessage() {
+    if (GardenConnectionMessageShown) {
+        return;
+    }
+
+    const MainContainer =
+        document.querySelector(".MainContainer");
+
+    if (MainContainer === null) {
+        return;
+    }
+
+    GardenConnectionMessageShown = true;
+
+    const Message = document.createElement("p");
+    Message.className = "PageMessage";
+    Message.textContent =
+        "Garden's server is currently unavailable. " +
+        "Some features may not work until the connection is restored.";
+
+    MainContainer.prepend(Message);
+}
+
+const OriginalFetch = window.fetch.bind(window);
+
+window.fetch = async function(...Arguments) {
+    const RequestUrl =
+        typeof Arguments[0] === "string"
+            ? Arguments[0]
+            : Arguments[0]?.url;
+
+    const IsGardenApiRequest =
+        typeof RequestUrl === "string" &&
+        new URL(
+            RequestUrl,
+            window.location.href
+        ).hostname === GardenApiHost;
+
+    try {
+        const Response =
+            await OriginalFetch(...Arguments);
+
+        if (
+            IsGardenApiRequest &&
+            Response.status >= 500
+        ) {
+            ShowGardenConnectionMessage();
+        }
+
+        return Response;
+    } catch (Error) {
+        if (IsGardenApiRequest) {
+            ShowGardenConnectionMessage();
+        }
+
+        throw Error;
+    }
+};