[ota] Skip safe_shutdown after partition-table OTA

For OTA_TYPE_UPDATE_PARTITION_TABLE the success path runs
nvs_flash_deinit() before the final write, which leaves every
preference handle held by other components invalid. App.safe_reboot()
calls on_safe_shutdown() which tries to flush preferences, and each
flush fails with ESP_ERR_NVS_INVALID_HANDLE -- noisy log spam during
the reboot window.

App.reboot() skips the safe-shutdown callbacks and goes straight to
esp_restart(). For partition-table OTAs there is nothing useful to
flush (NVS handles are already dead, the device is moments from a
reboot anyway), so reboot directly.

App-OTA path is unchanged: safe_reboot() still runs on_safe_shutdown
so preferences are saved on the way out.

esphome/components/esphome/ota/ota_esphome.cpp

@@ -498,6 +498,13 @@ void ESPHomeOTAComponent::handle_data_() {
   this->notify_state_(ota::OTA_COMPLETED, 100.0f, 0);
 #endif
   delay(100);  // NOLINT
+#ifdef USE_OTA_PARTITIONS
+  if (ota_type == ota::OTA_TYPE_UPDATE_PARTITION_TABLE) {
+    // Skip on_safe_shutdown: nvs_flash_deinit() has already invalidated open NVS handles, so
+    // preferences flush would emit ESP_ERR_NVS_INVALID_HANDLE for every entry. Reboot directly.
+    App.reboot();
+  }
+#endif
   App.safe_reboot();
 
 error: