adding save and battery voltage reading

main/gui.c

@@ -1395,28 +1395,32 @@ static lv_obj_t* create_volume_page(void) {
 
 static void show_volume_control(void) {
     ESP_LOGI(TAG, "Showing volume control");
-    
+
+    // Load saved volume from system
+    _current_volume = system_getVolume();
+    ESP_LOGI(TAG, "Loaded volume from system: %d", _current_volume);
+
     lv_obj_t* menu = create_menu_container();
     if (!menu) {
         ESP_LOGE(TAG, "Failed to create menu container for volume control");
         return;
     }
-    
+
     lv_obj_t* volume_page = create_volume_page();
     if (!volume_page) {
         ESP_LOGE(TAG, "Failed to create volume page");
         return;
     }
-    
+
     lv_menu_set_page(menu, volume_page);
     _currentPage = volume_page;
     _mode = GUI_MENU; // Keep in menu mode
 
     menu_hide_headers(menu);
-    
+
     lv_obj_remove_flag(menu, LV_OBJ_FLAG_HIDDEN);
     lv_obj_add_flag(_bubble, LV_OBJ_FLAG_HIDDEN);
-    
+
     ESP_LOGI(TAG, "Volume control displayed");
 }
 
@@ -1452,6 +1456,17 @@ static bool menu_stack_is_empty(void) {
 static void menu_go_back(void) {
     ESP_LOGI(TAG, "Menu go back requested");
 
+    // Save volume if exiting from volume page
+    if (_currentPage == _volume_page) {
+        system_setVolume(_current_volume);
+        esp_err_t ret = system_saveVolume();
+        if (ret == ESP_OK) {
+            ESP_LOGI(TAG, "Volume %d saved when exiting volume menu", _current_volume);
+        } else {
+            ESP_LOGE(TAG, "Failed to save volume: %s", esp_err_to_name(ret));
+        }
+    }
+
     if (menu_stack_is_empty()) {
         ESP_LOGI(TAG, "Menu stack empty, returning to bubble mode");
         _mode = GUI_BUBBLE;
@@ -1497,6 +1512,7 @@ static void update_volume_display(int volume) {
         UNLOCK();
 
         _current_volume = volume;
+        system_setVolume(volume);  // Update system state in real-time
         ESP_LOGI(TAG, "Volume display updated to %d%%", volume);
     }
 }