feat: Implement Discord app UI and settings management

- Added MainUI class for displaying voice state, status icon, and buttons.
- Introduced MainUIHandler to manage UI interactions and bridge communication.
- Created SettingsUI for displaying QR code and configuration instructions.
- Implemented SettingsUIHandler to manage settings and web server interactions.
- Developed WebHandler for handling HTTP requests for settings configuration.
- Updated AppRegistry to initialize with the new Discord app descriptor.
- Enhanced InteractionHandler to support keyboard interactions across app switches.
- Updated UIHandler to manage app switching and rendering of app icons.
- Enabled QR code support in LVGL configuration.

main/main.cpp

@@ -8,10 +8,12 @@
 #include "esp_flash.h"
 #include "esp_system.h"
 #include "esp_log.h"
+#include "esp_event.h"
 
 //
 #include "common/constants.h"
 #include "common/queue_defs.h"
+#include "common/system_context.h"
 #include "io/nvs_handler.h"
 #include "io/fs_handler.h"
 #include "info/info.h"
@@ -42,6 +44,15 @@ void init_queues(
 void app_main(void) {
   display_chip_info();
 
+  // Initialize default event loop early - required for UI events
+  esp_err_t err = esp_event_loop_create_default();
+  if (err != ESP_OK && err != ESP_ERR_INVALID_STATE) {
+    ESP_LOGE(TAG, "Failed to create default event loop: %s", esp_err_to_name(err));
+    vTaskDelay(5000 / portTICK_PERIOD_MS);
+    return esp_restart();
+  }
+  ESP_LOGI(TAG, "Default event loop created.\n");
+
   QueueHandle_t touch_event_queue = NULL;
   EventGroupHandle_t system_event_group = NULL, system_lifecycle_event_group = NULL;
 
@@ -76,7 +87,7 @@ void app_main(void) {
   // LVGL Handler
   std::unique_ptr<EInkDisplayHandler> display_uptr(display_handler);
   LVGLHandler lvgl_handler(std::move(display_uptr));
-  esp_err_t err = lvgl_handler.initLVGL(system_event_group);
+  err = lvgl_handler.initLVGL(system_event_group);
   if (err != ESP_OK) {
     ESP_LOGE(TAG, "Failed to initialize LVGL handler: %s", esp_err_to_name(err));
     vTaskDelay(5000 / portTICK_PERIOD_MS);
@@ -87,6 +98,9 @@ void app_main(void) {
   kv_storage_handler->init(system_event_group);
   network_handler->init(system_event_group);
 
+  // Make network handler available to apps
+  SystemContext::instance().set_network_handler(network_handler);
+
   //
   ESP_LOGI(TAG, "Waiting for system to be ready...\n");
   xEventGroupWaitBits(
@@ -100,7 +114,13 @@ void app_main(void) {
   );
   ESP_LOGI(TAG, "System is ready. Starting main application...\n");
 
-  // DiscordAppDescriptor::instance();
+  AppRegistry& app_registry = AppRegistry::instance();
+  err = app_registry.init();
+  if (err != ESP_OK) {
+    ESP_LOGE(TAG, "Failed to initialize App Registry: %s", esp_err_to_name(err));
+    vTaskDelay(5000 / portTICK_PERIOD_MS);
+    return esp_restart();
+  }
   UIHandler ui_handler;
   err = ui_handler.init();
   if (err != ESP_OK) {