Fix deprecated keyboard controller

lib/main.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import 'package:flutter/services.dart';
 import 'dart:io';
 import 'dart:convert';
+import 'dart:developer' as developer;
 
 void main() {
   runApp(const MyApp());
@@ -81,8 +82,8 @@ class _MyHomePageState extends State<MyHomePage> {
       };
       await file.writeAsString(jsonEncode(data));
     } catch (e) {
-      // Handle error silently for simplicity
-      print('Failed to save timer data: $e');
+      // Handle error silently using proper logging
+      developer.log('Failed to save timer data: $e', name: 'simple_timer');
     }
   }
 
@@ -105,8 +106,8 @@ class _MyHomePageState extends State<MyHomePage> {
         _reconstructTimerState();
       }
     } catch (e) {
-      // Handle error silently for simplicity
-      print('Failed to load timer data: $e');
+      // Handle error silently using proper logging
+      developer.log('Failed to load timer data: $e', name: 'simple_timer');
     }
   }
 
@@ -297,8 +298,8 @@ class _MyHomePageState extends State<MyHomePage> {
     return _formatDuration(duration);
   }
 
-  void _handleKeyEvent(RawKeyEvent event) {
-    if (event is RawKeyDownEvent) {
+  void _handleKeyEvent(KeyEvent event) {
+    if (event is KeyDownEvent) {
       if (event.logicalKey == LogicalKeyboardKey.space) {
         // Space: Start if paused, Lap if running
         if (_isRunning) {
@@ -326,9 +327,9 @@ class _MyHomePageState extends State<MyHomePage> {
 
   @override
   Widget build(BuildContext context) {
-    return RawKeyboardListener(
+    return KeyboardListener(
       focusNode: _focusNode,
-      onKey: _handleKeyEvent,
+      onKeyEvent: _handleKeyEvent,
       autofocus: true,
       child: Scaffold(
         appBar: AppBar(