Feature request: local learn/capture mode for HA (like jeedom_airsend's reception mode)

[PetitMichael]

Context

hass_airsend currently only sends radio commands — devices must be paired
via the AirSend Cloud app/portal, then exported as airsend.yaml and
manually placed in the HA config. There's no way to capture/learn a new
remote directly from Home Assistant.

Your own Jeedom plugin (jeedom_airsend) is described as working in both
"émission et réception" (send AND receive), which enables live learning
from within Jeedom itself. hass_airsend doesn't offer the equivalent.

Request

Would it be possible to add a learn/capture service to hass_airsend,
mirroring what jeedom_airsend already does? For example:

action: airsend.learn_command
target:
  entity_id: remote.airsend_box
data:
  device_name: "Volet chambre"

This would open a capture window on the physical AirSend Duo (same as
"Capturez et copier une télécommande" in the mobile app), and register
the resulting device/command locally — without needing to go through
airsend.cloud for every new remote.

Possible alternative: native radio_frequency platform

Home Assistant introduced a native radio_frequency entity platform in
2026.5, built specifically to decouple RF transmitters from consumer
integrations (developer docs:
https://developers.home-assistant.io/blog/2026/04/24/radio-frequency-entity-platform/).
Since 2026.6, this platform supports bidirectional reception for learning
new remotes (currently implemented by ESPHome and Broadlink RM4 Pro
transmitters).

Implementing RadioFrequencyTransmitterEntity for the AirSend Duo would
let hass_airsend plug into this native learning workflow going forward,
rather than maintaining a separate custom implementation.

Environment

• Home Assistant Core 2026.7.0 (HAOS 18.1)
• hass_airsend v4.1.0 (via HACS)
• hass_airsend-addon v1.3
• AirSend Duo (433/868 MHz)

Thanks for the great work on this integration — just missing this one
piece to fully replace our old Jeedom setup!