Make per-sensor weights visible and labelled in the zone form

Sensor weights already existed, but only as a second step after saving
a zone with two or more sensors, with fields labelled by raw keys such
as weight__sensor.living_a, so they were easy to miss.

The zone form now says that choosing two or more sensors leads to a
sensor-weight step. That step uses numbered fields ("Sensor 1 weight",
English and Romanian) and its description lists which sensor is which
by friendly name. Editing a multi-sensor zone shows the saved weights.
Stored data is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

custom_components/heating_mpc/config_flow.py

@@ -302,14 +302,23 @@ class ZoneSubentryFlow(config_entries.ConfigSubentryFlow):
         return await self._zone_form("reconfigure", user_input, existing, existing[ZONE_KEY])
 
     async def async_step_sensor_weights(self, user_input: dict[str, Any] | None = None):
+        """One weight per sensor; fields are numbered so they have translated labels."""
         sensors = self._draft[ZONE_SENSORS]
         if user_input is not None:
-            self._draft[ZONE_SENSOR_WEIGHTS] = {s: float(user_input[f"weight__{s}"]) for s in sensors}
+            self._draft[ZONE_SENSOR_WEIGHTS] = {
+                s: float(user_input[f"sensor_weight_{i}"]) for i, s in enumerate(sensors, 1)}
             return self._finish()
         weights = self._draft.get(ZONE_SENSOR_WEIGHTS) or {}
-        return self.async_show_form(step_id="sensor_weights", data_schema=vol.Schema({
-            vol.Required(f"weight__{s}", default=weights.get(s, 1.0)): _number(*SENSOR_WEIGHT_RANGE, 0.1)
-            for s in sensors}))
+        names = []
+        for i, sensor in enumerate(sensors, 1):
+            state = self.hass.states.get(sensor)
+            names.append(f"{i}. {state.name if state else sensor} ({sensor})")
+        return self.async_show_form(
+            step_id="sensor_weights",
+            data_schema=vol.Schema({
+                vol.Required(f"sensor_weight_{i}", default=weights.get(s, 1.0)): _number(*SENSOR_WEIGHT_RANGE, 0.1)
+                for i, s in enumerate(sensors, 1)}),
+            description_placeholders={"sensors": "\n".join(names)})
 
     def _finish(self):
         data = {key: self._draft[key] for key in (