check updates on start

lib/pages/comic_source_page.dart

@@ -14,11 +14,11 @@ import 'package:venera/utils/translations.dart';
 class ComicSourcePage extends StatefulWidget {
   const ComicSourcePage({super.key});
 
-  static void checkComicSourceUpdate([bool showLoading = false]) async {
+  static Future<void> checkComicSourceUpdate([bool implicit = false]) async {
     if (ComicSource.all().isEmpty) {
       return;
     }
-    var controller = showLoading ? showLoadingDialog(App.rootContext) : null;
+    var controller = implicit ? null : showLoadingDialog(App.rootContext);
     var dio = AppDio();
     var res = await dio.get<String>(
         "https://raw.githubusercontent.com/venera-app/venera-configs/master/index.json");
@@ -40,7 +40,9 @@ class ComicSourcePage extends StatefulWidget {
     }
     controller?.close();
     if (shouldUpdate.isEmpty) {
-      App.rootContext.showMessage(message: "No Update Available".tl);
+      if(!implicit) {
+        App.rootContext.showMessage(message: "No Update Available".tl);
+      }
       return;
     }
     var msg = "";
@@ -48,10 +50,11 @@ class ComicSourcePage extends StatefulWidget {
       msg += "${ComicSource.find(key)?.name}: v${versions[key]}\n";
     }
     msg = msg.trim();
-    showConfirmDialog(
+    await showConfirmDialog(
       context: App.rootContext,
       title: "Updates Available".tl,
       content: msg,
+      confirmText: "Update",
       onConfirm: () {
         for (var key in shouldUpdate) {
           var source = ComicSource.find(key);
@@ -104,7 +107,7 @@ class _BodyState extends State<_Body> {
       child: ListTile(
         leading: const Icon(Icons.update_outlined),
         title: Text("Check updates".tl),
-        onTap: () => ComicSourcePage.checkComicSourceUpdate(true),
+        onTap: () => ComicSourcePage.checkComicSourceUpdate(false),
         trailing: const Icon(Icons.arrow_right),
       ),
     );

lib/pages/settings/about.dart

@@ -53,30 +53,7 @@ class _AboutSettingsState extends State<AboutSettings> {
               setState(() {
                 isCheckingUpdate = true;
               });
-              checkUpdate().then((value) {
-                if (value) {
-                  showDialog(
-                      context: App.rootContext,
-                      builder: (context) {
-                        return ContentDialog(
-                            title: "New version available".tl,
-                            content: Text(
-                                "A new version is available. Do you want to update now?"
-                                    .tl),
-                            actions: [
-                              Button.text(
-                                onPressed: () {
-                                  Navigator.pop(context);
-                                  launchUrlString(
-                                      "https://github.com/venera-app/venera/releases");
-                                },
-                                child: Text("Update".tl),
-                              ),
-                            ]);
-                      });
-                } else {
-                  context.showMessage(message: "No new version available".tl);
-                }
+              checkUpdateUi().then((value) {
                 setState(() {
                   isCheckingUpdate = false;
                 });
@@ -108,6 +85,33 @@ Future<bool> checkUpdate() async {
   return false;
 }
 
+Future<void> checkUpdateUi([bool showMessageIfNoUpdate = true]) async {
+  var value = await checkUpdate();
+  if (value) {
+    showDialog(
+        context: App.rootContext,
+        builder: (context) {
+          return ContentDialog(
+            title: "New version available".tl,
+            content: Text(
+                "A new version is available. Do you want to update now?".tl),
+            actions: [
+              Button.text(
+                onPressed: () {
+                  Navigator.pop(context);
+                  launchUrlString(
+                      "https://github.com/venera-app/venera/releases");
+                },
+                child: Text("Update".tl),
+              ),
+            ],
+          );
+        });
+  } else if (showMessageIfNoUpdate) {
+    App.rootContext.showMessage(message: "No new version available".tl);
+  }
+}
+
 /// return true if version1 > version2
 bool _compareVersion(String version1, String version2) {
   var v1 = version1.split(".");