Set default clock alarm time and gate alarm time field by visibility

server/app/items/types/clock/definition.py

@@ -67,7 +67,7 @@ DEFAULT_PARAMS: dict = {
     "use24Hour": False,
     "topOfHourAnnounce": True,
     "alarmEnabled": False,
-    "alarmTime": "",
+    "alarmTime": "12:00 AM",
 }
 PARAM_KEYS: tuple[str, ...] = ("timeZone", "use24Hour", "topOfHourAnnounce", "alarmEnabled", "alarmTime")
 
@@ -81,5 +81,6 @@ PROPERTY_METADATA: dict[str, dict[str, object]] = {
         "valueType": "text",
         "tooltip": "Alarm time. Uses 24-hour HH:MM when 24 hour format is on, otherwise H:MM AM/PM.",
         "maxLength": 8,
+        "visibleWhen": {"alarmEnabled": True},
     },
 }

server/tests/test_item_use_cooldown.py

@@ -286,8 +286,9 @@ async def test_clock_timezone_update_validates(monkeypatch: pytest.MonkeyPatch)
         client,
         json.dumps({"type": "item_update", "itemId": item.id, "params": {"alarmEnabled": True}}),
     )
-    assert send_payloads[-1].ok is False
-    assert "alarmtime must be a valid time" in send_payloads[-1].message.lower()
+    assert send_payloads[-1].ok is True
+    assert item.params.get("alarmEnabled") is True
+    assert item.params.get("alarmTime") == "12:00 AM"
 
     await server._handle_message(
         client,