refactor(display): migrate from ST7735S to ST7789 driver

- Rename component directory from lvgl_st7735s_use to lvgl_st7789_use
- Update CMakeLists.txt to register new source files
- Add comprehensive README documentation for ST7789 configuration
- Add time_alarm module with SNTP synchronization and alarm management
- Add sensors header for sensor abstraction layer

components/ui/ui.h

@@ -0,0 +1,21 @@
+#ifndef EEZ_LVGL_UI_GUI_H
+#define EEZ_LVGL_UI_GUI_H
+
+#include <lvgl.h>
+
+#include "screens.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void ui_init();
+void ui_tick();
+
+void loadScreen(enum ScreensEnum screenId);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // EEZ_LVGL_UI_GUI_H