fix: explicitly add launcher buttons and power button to default group, declare stopScreensaverLocked, and disable idle screensaver timer on monochrome/RLCD screens

Tactility/Source/service/displayidle/DisplayIdle.cpp

@@ -32,17 +32,10 @@ static std::shared_ptr<hal::display::DisplayDevice> getDisplay() {
 
 void DisplayIdleService::stopScreensaverCb(lv_event_t* e) {
     auto* self = static_cast<DisplayIdleService*>(lv_event_get_user_data(e));
-    lv_event_stop_bubbling(e);
-    self->stopScreensaverRequested.store(true, std::memory_order_release);
-    lv_display_trigger_activity(nullptr);
+    self->stopScreensaverLocked();
 }
 
-void DisplayIdleService::stopScreensaver() {
-    if (!lvgl::lock(100)) {
-        // Lock failed - keep flag set to retry on next tick
-        return;
-    }
-
+void DisplayIdleService::stopScreensaverLocked() {
     const auto restoreDuty = cachedDisplaySettings.backlightDuty;
     const bool wasDimmed = displayDimmed;
 
@@ -54,7 +47,6 @@ void DisplayIdleService::stopScreensaver() {
         lv_obj_delete(screensaverOverlay);
         screensaverOverlay = nullptr;
     }
-    lvgl::unlock();
     stopScreensaverRequested.store(false, std::memory_order_relaxed);
 
     // Reset auto-off state
@@ -69,6 +61,15 @@ void DisplayIdleService::stopScreensaver() {
     displayDimmed = wasDimmed ? false : displayDimmed;
 }
 
+void DisplayIdleService::stopScreensaver() {
+    if (!lvgl::lock(100)) {
+        // Lock failed - keep flag set to retry on next tick
+        return;
+    }
+    stopScreensaverLocked();
+    lvgl::unlock();
+}
+
 void DisplayIdleService::activateScreensaver() {
     lv_obj_t* top = lv_layer_top();
 
@@ -203,6 +204,12 @@ void DisplayIdleService::tick() {
 }
 
 bool DisplayIdleService::onStart(ServiceContext& service) {
+    auto display = getDisplay();
+    if (display != nullptr && !display->supportsBacklightDuty()) {
+        LOGGER.info("Monochrome/RLCD display detected (no backlight control): disabling screensaver tick timer");
+        return true;
+    }
+
     // Seed random number generator for varied screensaver patterns
     srand(static_cast<unsigned int>(time(nullptr)));