Refactor RootLayout and UIHandler for improved structure and functionality

- Updated RootLayout to manage layout initialization and deinitialization more effectively.
- Removed unnecessary dependencies and streamlined event handling for keyboard events.
- Enhanced UIHandler to utilize shared pointers for app descriptors, improving memory management.
- Added methods for showing and hiding navigation elements in RootLayout.
- Introduced textarea widget with instant response by disabling animations.
- Improved error handling and logging throughout the UI components.

main/ui/events.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "esp_event.h"
+#include "lvgl.h"
+
+ESP_EVENT_DECLARE_BASE(UI_EVENT_BASE);
+
+struct KeyboardEventData {
+  lv_obj_t* textarea; ///< The textarea that triggered the keyboard event, nullptr if not applicable or for hide event
+};
+
+enum EventId {
+  UI_EVENT_KEYBOARD_SHOWN = 1,   ///< Event ID for keyboard shown event
+  UI_EVENT_KEYBOARD_HIDDEN = 2   ///< Event ID for keyboard hidden event
+};