Add Windows runner files for high DPI support and console output

- Created runner.exe.manifest to enable DPI awareness and dark mode support.
- Implemented utility functions in utils.cpp and utils.h for console creation and command line argument handling.
- Developed Win32Window class in win32_window.cpp and win32_window.h to manage high DPI-aware windows, including theme updates and message handling.

lib/platform/app_platform.dart

@@ -0,0 +1 @@
+export 'app_platform_stub.dart' if (dart.library.io) 'app_platform_io.dart';

lib/platform/app_platform_io.dart

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+import 'dart:io' show Platform;
+
+bool get isAndroid => Platform.isAndroid;
+
+bool get isIOS => Platform.isIOS;
+
+bool get isLinux => Platform.isLinux;
+
+bool get isMacOS => Platform.isMacOS;
+
+bool get isWindows => Platform.isWindows;
+
+bool get isDesktop => isLinux || isMacOS || isWindows;

lib/platform/app_platform_stub.dart

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+bool get isAndroid => false;
+
+bool get isIOS => false;
+
+bool get isLinux => false;
+
+bool get isMacOS => false;
+
+bool get isWindows => false;
+
+bool get isDesktop => false;

lib/platform/window_bootstrap.dart

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+export 'window_bootstrap_stub.dart' if (dart.library.io) 'window_bootstrap_io.dart';

lib/platform/window_bootstrap_io.dart

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+import 'package:flutter/material.dart';
+import 'package:notas/platform/app_platform.dart';
+import 'package:notas/platform/window_state.dart';
+import 'package:window_manager/window_manager.dart';
+
+Future<void> bootstrapWindow() async {
+  if (!isDesktop) {
+    return;
+  }
+
+  await windowManager.ensureInitialized();
+
+  final Size initialSize =
+      await WindowStateStore.instance.loadWindowSize() ?? const Size(900, 700);
+
+  final WindowOptions windowOptions = WindowOptions(
+    size: initialSize,
+    minimumSize: Size(400, 600),
+    center: true,
+    titleBarStyle: TitleBarStyle.hidden,
+  );
+
+  windowManager.waitUntilReadyToShow(windowOptions, () async {
+    await windowManager.show();
+    await windowManager.setMinimumSize(const Size(400, 600));
+    await windowManager.setSize(initialSize);
+    await windowManager.focus();
+  });
+}

lib/platform/window_bootstrap_stub.dart

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+Future<void> bootstrapWindow() async {}

lib/platform/window_state.dart

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+export 'window_state_stub.dart' if (dart.library.io) 'window_state_io.dart';

lib/platform/window_state_io.dart

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+import 'dart:ui';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+class WindowStateStore {
+  WindowStateStore._();
+
+  static final WindowStateStore instance = WindowStateStore._();
+
+  static const String _widthKey = 'window_width';
+  static const String _heightKey = 'window_height';
+
+  Future<Size?> loadWindowSize() async {
+    final SharedPreferences prefs = await SharedPreferences.getInstance();
+    final double? width = prefs.getDouble(_widthKey);
+    final double? height = prefs.getDouble(_heightKey);
+
+    if (width == null || height == null) {
+      return null;
+    }
+
+    return Size(width, height);
+  }
+
+  Future<void> saveWindowSize(Size size) async {
+    final SharedPreferences prefs = await SharedPreferences.getInstance();
+    await prefs.setDouble(_widthKey, size.width);
+    await prefs.setDouble(_heightKey, size.height);
+  }
+}

lib/platform/window_state_stub.dart

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+import 'dart:ui';
+
+class WindowStateStore {
+  WindowStateStore._();
+
+  static final WindowStateStore instance = WindowStateStore._();
+
+  Future<Size?> loadWindowSize() async {
+    return null;
+  }
+
+  Future<void> saveWindowSize(Size size) async {}
+}