Optimize dashboard categories and context loading

app/ha/discovery.py

@@ -95,6 +95,7 @@ _ACTUATOR_DOMAINS = frozenset({
     "media_player",
     "number",
     "remote",
+    "scene",
     "siren",
     "switch",
     "valve",
@@ -229,6 +230,8 @@ def _actuator_category(entity: HaEntitySummary) -> str:
         return "fan"
     if entity.domain in {"media_player", "remote"}:
         return "media_tv"
+    if entity.domain == "scene":
+        return "scene"
     if entity.domain in {"input_boolean", "number"}:
         return "helper"
     return entity.domain