Progress on basic UI for testing

lib/pages/app.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:obtainium/services/apps_provider.dart';
+import 'package:obtainium/services/source_service.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+import 'package:provider/provider.dart';
+
+class AppPage extends StatefulWidget {
+  const AppPage({super.key, required this.appId});
+
+  final String appId;
+
+  @override
+  State<AppPage> createState() => _AppPageState();
+}
+
+class _AppPageState extends State<AppPage> {
+  @override
+  Widget build(BuildContext context) {
+    var appsProvider = context.watch<AppsProvider>();
+    App? app = appsProvider.apps[widget.appId];
+    if (app == null) {
+      Navigator.pop(context);
+    }
+    return Scaffold(
+        appBar: AppBar(
+          title: Text('App - ${app?.name} - ${app?.author}'),
+        ),
+        body: WebView(
+          initialUrl: app?.url,
+        ));
+  }
+}