fix: Windows uyumlulugu - APPDATA config, taskkill

lib/shortcuts/app_shortcuts.dart

@@ -21,7 +21,11 @@ class AppShortcuts extends StatelessWidget {
 
           // Ctrl+Shift+Q: tüm pencereleri kapat
           if (ctrl && shift && event.logicalKey == LogicalKeyboardKey.keyQ) {
-            Process.runSync('pkill', ['imajviewer']);
+            if (Platform.isWindows) {
+              Process.runSync('taskkill', ['/F', '/IM', 'imajviewer.exe']);
+            } else {
+              Process.runSync('pkill', ['imajviewer']);
+            }
             return KeyEventResult.handled;
           }