Fix dashboard text overflow and close v1 docs gaps

tests/api/test_actuators.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from time import perf_counter
 from datetime import datetime, timedelta
 from pathlib import Path
 
@@ -299,6 +300,26 @@ def test_dashboard_overview_uses_cache_without_ha_roundtrip(tmp_path: Path) -> N
     assert payload["discovery_groups"]
 
 
+def test_dashboard_start_path_stays_within_five_second_budget(tmp_path: Path) -> None:
+    with TestClient(app) as client:
+        _install_service(tmp_path)
+        client.get("/v1/actuators/discovery")
+        client.post("/v1/actuators", json={"actuator_entity_id": "light.abstellkammer"})
+
+        root_started_at = perf_counter()
+        root_response = client.get("/")
+        root_elapsed = perf_counter() - root_started_at
+
+        dashboard_started_at = perf_counter()
+        dashboard_response = client.get("/v1/actuators/dashboard")
+        dashboard_elapsed = perf_counter() - dashboard_started_at
+
+    assert root_response.status_code == 200
+    assert dashboard_response.status_code == 200
+    assert root_elapsed < 5.0
+    assert dashboard_elapsed < 5.0
+
+
 def test_discovery_reads_entities_once_and_reuses_them(tmp_path: Path) -> None:
     with TestClient(app) as client:
         _install_service(tmp_path)