update app icon (#9219)

app.config.js

···
       runtimeVersion: {
         policy: 'appVersion',
       },
-      icon: './assets/app-icons/ios_icon_default_light.png',
+      icon: './assets/app-icons/ios_icon_default_next.png',
       userInterfaceStyle: 'automatic',
       primaryColor: '#1083fe',
       newArchEnabled: false,
···
         barStyle: 'light-content',
       },
       android: {
-        icon: './assets/app-icons/android_icon_default_light.png',
+        icon: './assets/app-icons/android_icon_default_next.png',
         adaptiveIcon: {
           foregroundImage: './assets/icon-android-foreground.png',
           monochromeImage: './assets/icon-android-foreground.png',
···
               prerendered: true,
             },
             next: {
-              ios: './assets/app-icons/icon_default_next.png',
-              android: './assets/app-icons/icon_default_next.png',
+              ios: './assets/app-icons/ios_icon_default_next.png',
+              android: './assets/app-icons/android_icon_default_next.png',
               prerendered: true,
             },
 

src/screens/Settings/AppIconSettings/useAppIconSets.ts

···
         id: 'next',
         name: _(msg({context: 'Name of app icon variant', message: 'Next'})),
         iosImage: () => {
-          return require(`../../../../assets/app-icons/icon_default_next.png`)
+          return require(
+            `../../../../assets/app-icons/ios_icon_default_next.png`,
+          )
         },
         androidImage: () => {
-          return require(`../../../../assets/app-icons/icon_default_next.png`)
+          return require(
+            `../../../../assets/app-icons/android_icon_default_next.png`,
+          )
         },
       },
     ] satisfies AppIconSet[]