Fix offline app exception handling, optimize patch

lib/models/globalModel.dart

@@ -34,7 +34,7 @@ class GlobalModel extends ChangeNotifier {
       } else {
         return "";
       }
-    } on SocketException catch (exce) {
+    } on (ClientException, SocketException, HttpException) catch (exce) {
       print("Unable to download hash");
       print(exce);
       return "";

scripts/pwaOffline.patch

@@ -1,15 +1,13 @@
---- menu/build/web/flutter_service_worker.js	2024-01-26 14:59:42.195084752 +0530
-+++ in/flutter_service_worker.pat.js	2024-01-26 15:07:37.253097455 +0530
-@@ -2,6 +2,7 @@
+--- flutter_service_worker.js.orig	2024-01-27 06:21:03.225353652 +0530
++++ flutter_service_worker.js	2024-01-27 06:56:23.531689565 +0530
+@@ -1,4 +1,5 @@
+ 'use strict';
++const BaseHREF = 'HREFREPLACE';
  const MANIFEST = 'flutter-app-manifest';
  const TEMP = 'flutter-temp-cache';
  const CACHE_NAME = 'flutter-app-cache';
-+const BaseHREF = 'HREFREPLACE';
- 
- const RESOURCES = {
-   "version.json": "d7fbd41faace5a7a02bb5da13e6049ec",
-@@ -37,10 +38,7 @@
- };
+@@ -36,10 +37,7 @@
+ "version.json": "d7fbd41faace5a7a02bb5da13e6049ec"};
  // The application shell files that are downloaded before a service worker can
  // start.
 -const CORE = ["main.dart.js",
@@ -19,28 +17,12 @@
 +const CORE = Object.keys(RESOURCES);
  
  // During install, the TEMP cache is populated with the application shell files.
- self.addEventListener("install", (event) =>
-@@ -139,13 +137,30 @@
-   {
+ self.addEventListener("install", (event) => {
+@@ -123,12 +121,13 @@
+   if (key.indexOf('?v=') != -1) {
      key = key.split('?v=')[0];
    }
 -  if (event.request.url == origin || event.request.url.startsWith(origin + '/#') || key == '') {
-+  if (key.endsWith("chromium/canvaskit.js"))
-+  {
-+    key = "canvaskit/chromium/canvaskit.js"
-+  }
-+  if (key.endsWith("chromium/canvaskit.wasm"))
-+  {
-+    key = "canvaskit/chromium/canvaskit.wasm"
-+  }
-+  if (key.endsWith("canvaskit.js"))
-+  {
-+    key = "canvaskit/canvaskit.js"
-+  }
-+  if (key.endsWith("canvaskit.wasm"))
-+  {
-+    key = "canvaskit/canvaskit.wasm"
-+  }
 +  if (event.request.url == origin || event.request.url.startsWith(origin + '/#') || key == '' || key == BaseHREF) {
      key = '/';
    }
@@ -51,3 +33,4 @@
 +  if (!RESOURCES[resKey]) {
      return;
    }
+   // If the URL is the index.html, perform an online-first request.