Fix for crash

.claude/rules/lvgl.md

@@ -6,6 +6,7 @@ Two kernel modules cover LVGL:
 
 - **`lvgl-module`** (`Modules/lvgl-module/`, `<lvgl/*.h>`) owns LVGL's lifecycle: init/deinit, the LVGL task loop, and `lvgl_lock()`/`lvgl_try_lock()`/`lvgl_unlock()` mutex-based locking that any task must hold before touching LVGL objects. It bridges Tactility's device model to LVGL indevs (`lvgl/devices/*.h`: `display`, `pointer`, `keyboard`, `trackball`), and provides shared fonts (`lvgl/fonts.h`: Montserrat text sizes, Material Symbols icon sets for statusbar/launcher/shared use) and a few shared widgets (`lvgl/widgets/*.h`: `toolbar`, `spinner`, `sliderbox`).
 - **`lvgl-window-manager-module`** (`Modules/lvgl-window-manager-module/`, `<lvgl_window_manager/*.h>`) manages a single stacked window per app instance on top of `lvgl-module`. `window_manager_start()`/`window_manager_stop()` create/tear down the root widget (plus optional chrome from a configured `WindowManagerScreenInitFn`); `window_manager_create()`/`window_manager_remove()` push/pop an app's window and (re)populate it via a `WindowCreateWidgetsFn`. Only the topmost window ever has live widgets - burying and resurfacing a window deletes and rebuilds its widget tree rather than hiding/showing it. That rebuild-on-remove path can run `create_widgets` on a *different* app's thread (whichever app's `window_manager_remove()` call caused this window to resurface), so `create_widgets` must only rebuild already-committed state, never decide what happens next - state transitions belong in the app's own `main()` event loop, driven by real `APP_EVENT_RESULT`s.
+  Widget pointers an app keeps become dangling once its window is buried (e.g. by a dialog it started). Use `window_manager_create_ext()` with a `destroy_widgets` callback that clears them, and skip widget updates from the app's own thread while they're cleared.
 
 ## Keyboard navigation
 

Tactility/Source/app/apphubdetails/AppHubDetailsApp.cpp

@@ -136,6 +136,10 @@ void onOperationEvent(Context* ctx, const AppHubEvent& event) {
 }
 
 void updateViews(Context* ctx) {
+    // Covered by another window (e.g. a dialog): createWidgets() updates the views when it's shown again
+    if (ctx->toolbar == nullptr) {
+        return;
+    }
     lvgl_toolbar_clear_actions(ctx->toolbar);
     ctx->spinner = lvgl_toolbar_add_spinner_action(ctx->toolbar);
     lv_obj_set_hidden(ctx->updateLabel, true);
@@ -200,6 +204,14 @@ void createWidgets(lv_obj_t* parent, void* userData) {
     updateViews(ctx);
 }
 
+void destroyWidgets(void* userData) {
+    auto* ctx = static_cast<Context*>(userData);
+    ctx->toolbar = nullptr;
+    ctx->spinner = nullptr;
+    ctx->updateButton = nullptr;
+    ctx->updateLabel = nullptr;
+}
+
 int32_t appMain(int argc, char* argv[]) {
     uint32_t appInstanceId = app_scheduler_current_app_id();
     // argv layout: [0]=appId
@@ -218,7 +230,7 @@ int32_t appMain(int argc, char* argv[]) {
     check(app_event_subscribe(&sub, &event_group) == ERROR_NONE);
     check(app_hub_event_subscribe(&ctx.appHubSub, &event_group) == ERROR_NONE);
 
-    WindowId window = window_manager_create(appInstanceId, createWidgets, &ctx);
+    WindowId window = window_manager_create_ext(appInstanceId, createWidgets, destroyWidgets, &ctx);
 
     bool shouldClose = false;
     while (!shouldClose) {