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/models/note.dart

@@ -0,0 +1,51 @@
+// Model: Note
+// - Representa una nota guardada en la app.
+// - `id` viene de SQLite y sirve como identificador estable.
+// - `index` representa el orden visual dentro de la lista.
+class Note {
+  const Note({
+    this.id,
+    required this.title,
+    required this.body,
+    required this.createdAt,
+    required this.updatedAt,
+    required this.index,
+  });
+
+  final int? id;
+  final String title;
+  final String body;
+  final DateTime createdAt;
+  final DateTime updatedAt;
+  final int index;
+
+  Note copyWith({
+    int? id,
+    String? title,
+    String? body,
+    DateTime? createdAt,
+    DateTime? updatedAt,
+    int? index,
+  }) {
+    return Note(
+      id: id ?? this.id,
+      title: title ?? this.title,
+      body: body ?? this.body,
+      createdAt: createdAt ?? this.createdAt,
+      updatedAt: updatedAt ?? this.updatedAt,
+      index: index ?? this.index,
+    );
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) {
+      return true;
+    }
+
+    return other is Note && id != null && other.id == id;
+  }
+
+  @override
+  int get hashCode => id?.hashCode ?? Object.hash(title, body, createdAt, updatedAt, index);
+}