fixing android build

lib/platform/browser_stub.dart

@@ -0,0 +1,18 @@
+/// Stub implementation of browser APIs for non-web platforms.
+class BrowserStorage {
+  String? getItem(String key) => null;
+  void setItem(String key, String value) {}
+  void removeItem(String key) {}
+}
+
+/// Stub for window.location
+class BrowserLocation {
+  String get href => '';
+  set href(String value) {}
+}
+
+/// Browser utility class for non-web platforms.
+class Browser {
+  static final BrowserStorage localStorage = BrowserStorage();
+  static final BrowserLocation location = BrowserLocation();
+}