Various improvements (#614)

- Auto-select widgets in Launcher and apps with toolbars on devices without touch.
- Improved USB HID input reliability, cleanup
- Updated PSRAM settings to improve boot stability on supported devices.
- Prevented duplicate Wi-Fi event subscriptions during screen rebuilds.
- Updated docs
- Fixes in WifiManage and WifiConnect
- Reduced main task stack size
- Moved USB HID stack size to PSRAM when available
- app_manager_find_manifest() now returns a copy instead of a pointer

Tactility/Source/app/wifimanage/View.cpp

@@ -323,10 +323,23 @@ void View::init(uint32_t newAppInstanceId, lv_obj_t* parent) {
 }
 
 void View::update() {
+    if (root == nullptr) {
+        // Buried (or not yet built) - see reset().
+        return;
+    }
     updateWifiToggle();
     updateScanning();
     updateNetworkList();
     updateConnectToHidden();
 }
 
+void View::reset() {
+    root = nullptr;
+    enable_switch = nullptr;
+    enable_on_boot_switch = nullptr;
+    scanning_spinner = nullptr;
+    networks_list = nullptr;
+    connect_to_hidden = nullptr;
+}
+
 } // namespace

Tactility/Source/app/wifimanage/WifiManage.cpp

@@ -65,6 +65,8 @@ static void onConnectToHidden() {
 void requestViewUpdate(Context* ctx) {
     ctx->lock();
     lvgl_lock();
+    // Safe even while buried (e.g. WifiApSettings/WifiConnect opened on top): destroyWidgets()
+    // nulls the view's widget pointers before they're deleted, and update() no-ops on that.
     ctx->view.update();
     lvgl_unlock();
     ctx->unlock();
@@ -103,6 +105,13 @@ void createWidgets(lv_obj_t* parent, void* userData) {
     ctx->unlock();
 }
 
+// Runs with the LVGL lock already held, possibly on another app's thread - see
+// WindowDestroyWidgetsFn's warnings. Must stay lock-free: View::reset() only nulls pointers.
+void destroyWidgets(void* userData) {
+    auto* ctx = static_cast<Context*>(userData);
+    ctx->view.reset();
+}
+
 int32_t appMain(uint32_t appInstanceId, int argc, char* argv[]) {
     Context ctx;
     ctx.appInstanceId = appInstanceId;
@@ -127,7 +136,7 @@ int32_t appMain(uint32_t appInstanceId, int argc, char* argv[]) {
     sub.app_instance_id = appInstanceId;
     app_event_subscribe(&sub);
 
-    WindowId window = window_manager_create(appInstanceId, createWidgets, &ctx);
+    WindowId window = window_manager_create_ext(appInstanceId, createWidgets, destroyWidgets, &ctx);
 
     service::wifi::RadioState radio_state = service::wifi::getRadioState();
     bool can_scan = radio_state == service::wifi::RadioState::On ||