fix(screen): streamline runtime display states

components/control_plane/src/control_plane_lifecycle.c

@@ -151,6 +151,7 @@ static void lifecycle_power_key_task_main(void *arg) {
         }
 
         ESP_LOGW(TAG, "POWER_KEY long press detected: stopping services and powering off");
+        (void)screen_preview_show_event(SCREEN_PREVIEW_EVENT_SHUTDOWN, NULL);
 
         esp_err_t stop_rc = ESP_ERR_INVALID_STATE;
         for (uint16_t attempt = 0; attempt < POWER_KEY_STOP_RETRY_COUNT; ++attempt) {
@@ -282,6 +283,7 @@ esp_err_t control_plane_lifecycle_start(void) {
         goto start_failed;
     }
     printer_started = true;
+    (void)screen_preview_start_runtime_feedback();
 
     failed_stage = "voice_interaction";
     rc = lifecycle_run_step_with_retry("voice_interaction", lifecycle_start_voice);
@@ -310,6 +312,7 @@ esp_err_t control_plane_lifecycle_start(void) {
         xSemaphoreGive(s_lock);
     }
 
+    (void)screen_preview_show_event(SCREEN_PREVIEW_EVENT_RUNTIME_READY, NULL);
     ESP_LOGI(TAG, "control-plane lifecycle started");
     return ESP_OK;
 
@@ -321,6 +324,7 @@ start_failed:
         (void)lifecycle_stop_voice();
     }
     if (printer_started) {
+        screen_preview_stop_runtime_feedback();
         (void)lifecycle_stop_printer_protocol();
     }
     if (system_started) {
@@ -337,6 +341,10 @@ start_failed:
              "control-plane lifecycle start failed at stage=%s, rc=0x%x",
              failed_stage,
              (unsigned)rc);
+    screen_preview_context_t ctx = {
+        .detail = failed_stage,
+    };
+    (void)screen_preview_show_event(SCREEN_PREVIEW_EVENT_RUNTIME_ERROR, &ctx);
     return rc;
 }
 
@@ -360,6 +368,7 @@ esp_err_t control_plane_lifecycle_stop(void) {
     xSemaphoreGive(s_lock);
 
     lifecycle_power_key_worker_unbind();
+    (void)screen_preview_show_event(SCREEN_PREVIEW_EVENT_SHUTDOWN, NULL);
 
     esp_err_t first_err = ESP_OK;
 
@@ -373,6 +382,7 @@ esp_err_t control_plane_lifecycle_stop(void) {
         first_err = rc;
     }
 
+    screen_preview_stop_runtime_feedback();
     rc = lifecycle_stop_printer_protocol();
     if (rc != ESP_OK && first_err == ESP_OK) {
         first_err = rc;