feat: add application icon support and include icon asset in pubspec.yaml

linux/runner/my_application.cc

@@ -25,6 +25,19 @@ static void my_application_activate(GApplication* application) {
   GtkWindow* window =
       GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
 
+      // --- BLOQUE PARA EL ICONO ---
+      GError* error = nullptr;
+      gchar* exe_path = g_file_read_link("/proc/self/exe", &error);
+      if (exe_path != nullptr) {
+        gchar* exe_dir = g_path_get_dirname(exe_path);
+        gchar* icon_path = g_build_filename(exe_dir, "data", "flutter_assets", "assets", "icon.png", nullptr);
+        gtk_window_set_icon_from_file(window, icon_path, nullptr);
+        g_free(icon_path);
+        g_free(exe_dir);
+        g_free(exe_path);
+      }
+      // ----------------------------------------
+
   // Use a header bar when running in GNOME as this is the common style used
   // by applications and is the setup most users will be using (e.g. Ubuntu
   // desktop).