updated ui added new features

lib/utils/contact_search.dart

@@ -0,0 +1,26 @@
+import '../models/contact.dart';
+
+bool matchesContactQuery(Contact contact, String query) {
+  final normalizedQuery = query.trim().toLowerCase();
+  if (normalizedQuery.isEmpty) return true;
+
+  if (contact.name.toLowerCase().contains(normalizedQuery)) {
+    return true;
+  }
+
+  final hexPrefix = _extractHexPrefix(normalizedQuery);
+  if (hexPrefix == null) return false;
+
+  return contact.publicKeyHex.toLowerCase().startsWith(hexPrefix);
+}
+
+String? _extractHexPrefix(String query) {
+  var cleaned = query;
+  if (cleaned.startsWith('0x')) {
+    cleaned = cleaned.substring(2);
+  }
+  cleaned = cleaned.replaceAll(' ', '');
+  if (cleaned.length < 2) return null;
+  if (!RegExp(r'^[0-9a-f]+$').hasMatch(cleaned)) return null;
+  return cleaned;
+}

lib/utils/route_transitions.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/material.dart';
+
+Route<T> buildQuickSwitchRoute<T>(Widget page) {
+  return PageRouteBuilder<T>(
+    pageBuilder: (context, animation, secondaryAnimation) => page,
+    transitionDuration: const Duration(milliseconds: 220),
+    reverseTransitionDuration: const Duration(milliseconds: 200),
+    transitionsBuilder: (context, animation, secondaryAnimation, child) {
+      final curved = CurvedAnimation(
+        parent: animation,
+        curve: Curves.easeOutCubic,
+        reverseCurve: Curves.easeInCubic,
+      );
+      return FadeTransition(
+        opacity: curved,
+        child: SlideTransition(
+          position: Tween<Offset>(
+            begin: const Offset(0.02, 0),
+            end: Offset.zero,
+          ).animate(curved),
+          child: child,
+        ),
+      );
+    },
+  );
+}