use a toast instead of alerting

src/main/resources/static/assets/script.js

@@ -17,7 +17,7 @@ const upload = async () => {
 
   if (!paste || paste.trim() === "") {
     pasteInput.focus();
-    alert("Your paste is empty!");
+    toast("Please enter a paste to upload.");
     return;
   }
 
@@ -35,6 +35,16 @@ const upload = async () => {
     window.location.href = "/" + data.id;
   } catch (error) {
     console.error("Error:", error);
-    alert(`${error.message || "An error occurred while uploading the paste."}`);
+    toast(`${error.message || "An error occurred while uploading the paste."}`);
   }
 };
+
+const toast = (message, duration = 3000) => {
+  Toastify({
+    text: message,
+    duration: duration,
+    close: true,
+    gravity: "bottom",
+    position: "right",
+  }).showToast();
+};