Add preview image to lcd display

main/display/display.cc

@@ -15,10 +15,6 @@
 #define TAG "Display"
 
 Display::Display() {
-    // Load theme from settings
-    Settings settings("display", false);
-    current_theme_name_ = settings.GetString("theme", "light");
-
     // Notification timer
     esp_timer_create_args_t notification_timer_args = {
         .callback = [](void *arg) {
@@ -235,6 +231,10 @@ void Display::SetIcon(const char* icon) {
     lv_label_set_text(emotion_label_, icon);
 }
 
+void Display::SetPreviewImage(const lv_img_dsc_t* image) {
+    // Do nothing
+}
+
 void Display::SetChatMessage(const char* role, const char* content) {
     DisplayLockGuard lock(this);
     if (chat_message_label_ == nullptr) {