fix: ok tuslari HardwareKeyboard, topbar 16px, border kaldirildi

lib/screens/viewer_screen.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:window_manager/window_manager.dart';
 import 'package:desktop_drop/desktop_drop.dart';
 import '../services/image_manager.dart';
@@ -24,11 +25,26 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
   Timer? _pollTimer;
   Rect _lastBounds = Rect.zero;
 
+  bool _handleKeyEvent(KeyEvent event) {
+    if (event is KeyDownEvent) {
+      switch (event.logicalKey) {
+        case LogicalKeyboardKey.arrowLeft:
+          ImageManager.instance.previousImage();
+          return true;
+        case LogicalKeyboardKey.arrowRight:
+          ImageManager.instance.nextImage();
+          return true;
+      }
+    }
+    return false;
+  }
+
   @override
   void initState() {
     super.initState();
     windowManager.addListener(this);
     ImageManager.instance.addListener(_onImageManagerChanged);
+    HardwareKeyboard.instance.addHandler(_handleKeyEvent);
 
     if (widget.initialFiles.isNotEmpty) {
       WidgetsBinding.instance.addPostFrameCallback((_) {
@@ -62,6 +78,7 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
 
   @override
   void dispose() {
+    HardwareKeyboard.instance.removeHandler(_handleKeyEvent);
     windowManager.removeListener(this);
     ImageManager.instance.removeListener(_onImageManagerChanged);
     _saveDebounce?.cancel();
@@ -119,7 +136,7 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
             child: Stack(
               children: [
                 Positioned(
-                  top: 28,
+                  top: 16,
                   left: 0,
                   right: 0,
                   bottom: 0,