toggle: add Shutdown as a Quick Launch shortcut option

Add a shutdown toggle app so users can assign "Shutdown" to any
Quick Launch button.  On activation the user sees a confirmation
dialog ("Do you want to shut down?"); confirming calls
battery_ui_handle_shut_down() via the launcher task, matching
the existing shutdown path used by the system settings menu.

The app is registered with ProcessVisibilityQuickLaunch so it
only appears in the Quick Launch app-picker, not the main app
launcher.

Signed-off-by: GitHub Copilot <noreply@github.com>
Co-authored-by: s00se <95649696+s00se@users.noreply.github.com>

Author: Copilot

src/fw/apps/system/toggle/shutdown.c

@@ -0,0 +1,63 @@
+/* SPDX-FileCopyrightText: 2025 The PebbleOS Contributors */
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#include "shutdown.h"
+
+#include "applib/app.h"
+#include "applib/ui/dialogs/actionable_dialog.h"
+#include "applib/ui/dialogs/dialog.h"
+#include "kernel/event_loop.h"
+#include "process_management/app_manager.h"
+#include "pbl/services/i18n/i18n.h"
+#include "resource/resource_ids.auto.h"
+#include "shell/normal/battery_ui.h"
+
+static void prv_do_shutdown(void *data) {
+  battery_ui_handle_shut_down();
+}
+
+static void prv_shutdown_confirm_cb(ClickRecognizerRef recognizer, void *context) {
+  actionable_dialog_pop((ActionableDialog *)context);
+  launcher_task_add_callback(prv_do_shutdown, NULL);
+}
+
+static void prv_shutdown_back_cb(ClickRecognizerRef recognizer, void *context) {
+  actionable_dialog_pop((ActionableDialog *)context);
+}
+
+static void prv_shutdown_click_provider(void *context) {
+  window_single_click_subscribe(BUTTON_ID_SELECT, prv_shutdown_confirm_cb);
+  window_single_click_subscribe(BUTTON_ID_BACK, prv_shutdown_back_cb);
+}
+
+static void prv_main(void) {
+  ActionableDialog *a_dialog = actionable_dialog_create("Shutdown");
+  Dialog *dialog = actionable_dialog_get_dialog(a_dialog);
+
+  actionable_dialog_set_action_bar_type(a_dialog, DialogActionBarConfirm, NULL);
+  actionable_dialog_set_click_config_provider(a_dialog, prv_shutdown_click_provider);
+
+  dialog_set_text_color(dialog, GColorWhite);
+  dialog_set_background_color(dialog, GColorCobaltBlue);
+  /// Confirmation message shown in the shutdown Quick Launch dialog.
+  dialog_set_text(dialog, i18n_get("Do you want to shut down?", a_dialog));
+  dialog_set_icon(dialog, RESOURCE_ID_GENERIC_QUESTION_LARGE);
+
+  i18n_free_all(a_dialog);
+
+  app_actionable_dialog_push(a_dialog);
+  app_event_loop();
+}
+
+const PebbleProcessMd *shutdown_toggle_get_app_info(void) {
+  static const PebbleProcessMdSystem s_app_info = {
+    .common = {
+      .main_func = &prv_main,
+      .uuid = SHUTDOWN_TOGGLE_UUID,
+      .visibility = ProcessVisibilityQuickLaunch,
+    },
+    /// Name of the Shutdown Quick Launch option shown in Quick Launch settings.
+    .name = i18n_noop("Shutdown"),
+  };
+  return &s_app_info.common;
+}

src/fw/apps/system/toggle/shutdown.h

@@ -0,0 +1,11 @@
+/* SPDX-FileCopyrightText: 2025 The PebbleOS Contributors */
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#include "process_management/app_manager.h"
+
+#define SHUTDOWN_TOGGLE_UUID {0x8b, 0x9a, 0x7c, 0x3e, 0x45, 0xd1, 0x4f, 0x89, \
+                              0xb2, 0x56, 0xee, 0xcc, 0xdd, 0xbb, 0xaa, 0x01}
+
+const PebbleProcessMd *shutdown_toggle_get_app_info(void);

src/fw/shell/normal/system_app_registry_list.json

@@ -574,6 +574,11 @@
       "enum": "AIRPLANE_MODE_TOGGLE",
       "md_fn": "airplane_mode_toggle_get_app_info"
     },
+    {
+      "id": -100,
+      "enum": "SHUTDOWN_TOGGLE",
+      "md_fn": "shutdown_toggle_get_app_info"
+    },
     {
       "id": -96,
       "enum": "TIMELINE_PAST",