chore:invoke onesignal push popup

lib/pages/onboard.dart

@@ -1,7 +1,7 @@
 // ignore_for_file: avoid_web_libraries_in_flutter
 
 import 'dart:convert';
-
+import 'dart:js' as js;
 import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
@@ -444,6 +444,7 @@ class _OnboardState extends State<Onboard> {
                           // js.context.callMethod("saveData",
                           //     ["timetable", jsonEncode(compressedTimetable)]);
                           if (!mounted) return;
+                          js.context.callMethod("openPopup");
                           Navigator.pushReplacementNamed(context, "/home");
                         }
                       }

web/index.html

@@ -44,9 +44,33 @@
     OneSignalDeferred.push(function (OneSignal) {
       OneSignal.init({
         appId: "d43f4e31-c574-4639-b7e6-76ae0e24b8d2",
+        notifyButton: {
+          enable: true
+        },
+        promptOptions: {
+          slidedown: {
+            prompts: [
+              {
+                type: "push", // current types are "push" & "category"
+                autoPrompt: false,
+                text: {
+                  /* limited to 90 characters */
+                  actionMessage: "We'd like to show you notifications for the latest news and updates.",
+                  /* acceptButton limited to 15 characters */
+                  acceptButton: "Allow",
+                  /* cancelButton limited to 15 characters */
+                  cancelButton: "Cancel"
+                },
+              }
+            ]
+          }
+        },
+        serviceWorkerParam: { scope: "/" },
+        serviceWorkerPath: "/OneSignalSDKWorker.js",
       });
     });
   </script>
+  <script src="open_popup.js" defer></script>
   <script src="flutter.js" defer></script>
 </head>
 

web/open_popup.js

@@ -0,0 +1,3 @@
+function openPopup() {
+    OneSignal.Slidedown.promptPush({force: true});
+}