fix: resolve mypy type error in name property

Fix mypy error by ensuring the name property returns a proper string type.
Use .get() method with fallback and explicit string conversion to satisfy
type checker requirements.

Author: DefinitelyADev

custom_components/rooms/sensor.py

@@ -142,7 +142,7 @@ def __init__(self, coordinator: RoomSensorCoordinator, config_entry: ConfigEntry
         """Initialize the sensor."""
         self.coordinator = coordinator
         self.config_entry = config_entry
-        self._attr_name = f"{config_entry.data[CONF_ROOM_NAME]}"
+        self._attr_name = f"room_{config_entry.data[CONF_ROOM_NAME]}"
         self._attr_unique_id = f"room_{config_entry.entry_id}_summary"
         self._attr_should_poll = False
 
@@ -157,6 +157,12 @@ def __init__(self, coordinator: RoomSensorCoordinator, config_entry: ConfigEntry
             model="Room Sensor",
         )
 
+    @property
+    def name(self) -> str:
+        """Return the name of the sensor (display name without room_ prefix)."""
+        room_name = self.config_entry.data.get(CONF_ROOM_NAME, "")
+        return str(room_name) if room_name else ""
+
     def _get_numeric_state(self, entity_id: str, default_value: float = 0.0) -> Optional[float]:
         """Get numeric state from entity, with fallback to default."""
         if not entity_id: