feat: Add initial mobile dashboard screen with Xtream data and UI state providers.

lib/core/utils/platform_utils.dart

@@ -1,4 +1,6 @@
 /// Platform utilities - conditional export
 /// Uses web implementation on web, stub on other platforms
+library;
+
 export 'platform_utils_stub.dart'
     if (dart.library.html) 'platform_utils_web.dart';

lib/core/utils/platform_utils_stub.dart

@@ -1,5 +1,6 @@
 /// Platform-specific utilities for web
 /// This file is used when compiling for web
+library;
 
 /// Check if we're running on HTTPS
 bool isHttps() {

lib/core/utils/platform_utils_web.dart

@@ -1,5 +1,7 @@
 /// Platform-specific utilities for web
 /// This file is used when compiling for web
+library;
+
 import 'dart:html' as html;
 
 /// Check if we're running on HTTPS