feat: add old browser checks

frontend/spa/src/App.vue

@@ -8,7 +8,9 @@
 
         <section class="telecart-main-section">
           <FullscreenViewport v-if="platform === 'ios' || platform === 'android'"/>
-
+          <div class="fixed inset-0 z-50 bg-white flex items-center justify-center text-center p-4">
+            <BrowserNotSupported/>
+          </div>
           <AppDebugMessage v-if="settings.app_debug"/>
 
           <RouterView v-slot="{ Component, route }">
@@ -72,6 +74,7 @@ import Dock from "@/components/Dock.vue";
 import AppDebugMessage from "@/components/AppDebugMessage.vue";
 import PrivacyPolicy from "@/components/PrivacyPolicy.vue";
 import {useSwipeBack} from "@/composables/useSwipeBack.js";
+import BrowserNotSupported from "@/BrowserNotSupported.vue";
 
 const tg = useMiniApp();
 const platform = ref();