TF-2008 Add NetworkConnectionBanner widget

(cherry picked from commit df6514ebb54a5032da0a832aa16a99e8737f03ed)

core/lib/presentation/extensions/color_extension.dart

@@ -181,6 +181,8 @@ extension AppColor on Color {
   static const colorErrorState = Color(0xFFE64646);
   static const colorBackgroundErrorState = Color(0xFFFAEBEB);
   static const colorBackgroundDeliveringState = Color(0xFFF2F3F5);
+  static const colorNetworkConnectionBannerBackground = Color(0x99EBEDF0);
+  static const colorNetworkConnectionLabel = Color(0xFF818C99);
 
   static const mapGradientColor = [
     [Color(0xFF21D4FD), Color(0xFFB721FF)],

lib/features/network_connection/presentation/network_connection_banner_widget.dart

@@ -0,0 +1,34 @@
+
+import 'package:core/presentation/extensions/color_extension.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
+
+class NetworkConnectionBannerWidget extends StatelessWidget {
+
+  const NetworkConnectionBannerWidget({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      color: AppColor.colorNetworkConnectionBannerBackground,
+      width: double.infinity,
+      padding: const EdgeInsetsDirectional.symmetric(vertical: 6, horizontal: 16),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          const CupertinoActivityIndicator(),
+          const SizedBox(width: 8),
+          Text(
+            AppLocalizations.of(context).no_internet_connection,
+            textAlign: TextAlign.center,
+            style: const TextStyle(
+              color: AppColor.colorNetworkConnectionLabel,
+              fontSize: 14,
+              fontWeight: FontWeight.w500,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}