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

Tactility/Private/Tactility/service/displayidle/DisplayIdleService.h

@@ -37,6 +37,7 @@ class DisplayIdleService final : public Service {
     bool backlightOff = false;
 
     static void stopScreensaverCb(lv_event_t* e);
+    void stopScreensaverLocked();
 
     /** @pre Caller must hold LVGL lock */
     void activateScreensaver();

Tactility/Source/app/launcher/Launcher.cpp

@@ -54,6 +54,11 @@ class LauncherApp final : public App {
         lv_obj_set_style_outline_pad(apps_button, 2, LV_STATE_FOCUSED);
         lv_obj_set_style_outline_color(apps_button, lv_theme_get_color_primary(apps_button), LV_STATE_FOCUSED);
 
+        auto* default_group = lv_group_get_default();
+        if (default_group) {
+            lv_group_add_obj(default_group, apps_button);
+        }
+
         // create the image first
         auto* button_image = lv_image_create(apps_button);
         lv_obj_set_style_text_font(button_image, lvgl_get_launcher_icon_font(), LV_STATE_DEFAULT);
@@ -218,6 +223,16 @@ public:
             lv_obj_set_style_shadow_width(power_button, 0, LV_STATE_DEFAULT);
             lv_obj_set_style_bg_opa(power_button, 0, LV_PART_MAIN);
 
+            // Add high-contrast focus outline for monochrome / RLCD screens
+            lv_obj_set_style_outline_width(power_button, 2, LV_STATE_FOCUSED);
+            lv_obj_set_style_outline_pad(power_button, 2, LV_STATE_FOCUSED);
+            lv_obj_set_style_outline_color(power_button, lv_theme_get_color_primary(power_button), LV_STATE_FOCUSED);
+
+            auto* default_group = lv_group_get_default();
+            if (default_group) {
+                lv_group_add_obj(default_group, power_button);
+            }
+
             auto* power_label = lv_label_create(power_button);
             lv_label_set_text(power_label, LV_SYMBOL_POWER);
             lv_obj_set_style_text_color(power_label, lv_theme_get_color_primary(parent), LV_STATE_DEFAULT);

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)));