feat: complete migration to config flow and bugfixes (@38decibel)

* feat: migrate to config flow with device registry and brand icons

- Migrate all platforms to async_setup_entry (config flow)
- Each device now appears as a real HA device in the device registry
- Add device_info to all entities (cover, switch, button, sensor, binary_sensor)
- Add config_flow.py with airsend.yaml + !secret resolution
- Add strings.json for UI labels
- Fix unique_id bug (was splitting each character of the name)
- Split binary_sensor.py from sensor.py
- Bump version to 4.0

* Add icon for local brand

* Revise installation steps for AirSend integration

* Correction du crash websocket

raise Exception remplacé par return False

* Update README with AirSend configuration steps

Added instructions for configuring AirSend in Home Assistant.

* Update README with clearer instructions for YAML

Clarified instructions for editing the airsend.yaml file.

* Add files via upload

* Add English translation for AirSend configuration

* Add fr translations

* Update screenshot following latest version

* Fixe unavailable and new type light

Corrections de bugs
500 avec wait: true non fatal

Nouveau type
light.py — lumière dimmable (type 4100)

custom_components/airsend/binary_sensor.py

@@ -0,0 +1,61 @@
+"""AirSend binary sensors — state monitoring for AirSend boxes (type 0)."""
+import logging
+
+from homeassistant.components.binary_sensor import BinarySensorEntity, BinarySensorDeviceClass
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from .coordinator import AirSendCoordinator
+from . import DOMAIN
+
+_LOGGER = logging.getLogger(DOMAIN)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    coordinators: dict[str, AirSendCoordinator] = (
+        hass.data[DOMAIN][entry.entry_id]["coordinators"]
+    )
+    entities = []
+    for name, coordinator in coordinators.items():
+        if coordinator.device.is_airsend:
+            entities.append(AirSendStateSensor(coordinator))
+    async_add_entities(entities)
+
+
+class AirSendStateSensor(CoordinatorEntity, BinarySensorEntity):
+    """Binary sensor representing the running state of an AirSend box."""
+
+    def __init__(self, coordinator: AirSendCoordinator) -> None:
+        super().__init__(coordinator)
+        self._unique_id = DOMAIN + "_" + str(coordinator.device.unique_channel_name) + "_state"
+
+    @property
+    def unique_id(self):
+        return self._unique_id
+
+    @property
+    def name(self):
+        return self.coordinator.device.name + "_state"
+
+    @property
+    def device_class(self) -> BinarySensorDeviceClass:
+        return BinarySensorDeviceClass.RUNNING
+
+    @property
+    def available(self) -> bool:
+        return self.coordinator.data.get("available", True)
+
+    @property
+    def is_on(self) -> bool | None:
+        return self.coordinator.data.get("available", True)
+
+    @property
+    def device_info(self) -> DeviceInfo:
+        return self.coordinator.device.device_info