refactor: improve watchdog handling and screen loading in UI and display handlers

main/ui/ui_handler.cpp

@@ -2,6 +2,7 @@
 #include "ui/root_layout.h"
 #include "ui/app_registry.h"
 #include "esp_log.h"
+#include "lvgl.h"
 
 #define TAG "UIHandler"
 
@@ -45,8 +46,14 @@ esp_err_t UIHandler::init(void) {
     ESP_LOGW(TAG, "Failed to render app icons");
   }
 
-  // Load the main screen
-  lv_screen_load(_main_screen);
+  // Defer screen loading to prevent blocking during initialization
+  // Use LVGL timer to load screen after allowing watchdog reset
+  lv_timer_create([](lv_timer_t* timer) {
+    lv_obj_t* screen = static_cast<lv_obj_t*>(lv_timer_get_user_data(timer));
+    ESP_LOGI("UIHandler", "Loading main screen via timer");
+    lv_screen_load(screen);
+    lv_timer_del(timer);
+    }, 100, _main_screen);  // 100ms delay to allow watchdog reset
 
   ESP_LOGI(TAG, "UIHandler initialized successfully");
   return ESP_OK;