refactored welcome string to splash screen

lib/features/auth/screens/splash_screen.dart

@@ -0,0 +1,62 @@
+import '../../../l10n/app_localizations.dart';
+
+import 'package:flutter/material.dart';
+
+class SplashScreen extends StatefulWidget {
+  const SplashScreen({super.key});
+
+  @override
+  State<SplashScreen> createState() => _SplashScreenState();
+}
+
+class _SplashScreenState extends State<SplashScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Stack(
+        children: [
+          Positioned.fill(
+            child: Image.asset(
+              'assets/images/kconnect2.webp',
+              fit: BoxFit.cover,
+            ),
+          ),
+          Center(
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Text(
+                  AppLocalizations.of(context).kconnect,
+                  style: const TextStyle(
+                    fontSize: 36,
+                    fontWeight: FontWeight.bold,
+                    color: Color(0xFFFFFFFF),
+                  ),
+                ),
+                const SizedBox(height: 12),
+                Text(
+                  AppLocalizations.of(context).kccBankFull,
+                  textAlign: TextAlign.center,
+                  style: const TextStyle(
+                    fontSize: 18,
+                    color: Color(0xFFFFFFFF),
+                    letterSpacing: 1.2,
+                  ),
+                ),
+              ],
+            ),
+          ),
+          Positioned(
+            bottom: 40,
+            left: 0,
+            right: 0,
+            child: Center(
+              child: CircularProgressIndicator(
+                  color: Theme.of(context).scaffoldBackgroundColor),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}