Remove battery device_class from Fox SOH sensor to prevent HA low-battery false alerts (#4490)

* Initial plan

* Fix Fox SOH sensor to avoid low-battery device class

Co-authored-by: springfall2008 <48591903+springfall2008@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: springfall2008 <48591903+springfall2008@users.noreply.github.com>

Author: Copilot

apps/predbat/fox.py

@@ -1792,7 +1792,7 @@ async def publish_data(self):
             self.dashboard_item(
                 entity_name_sensor + "_" + sn.lower() + "_battery_soh",
                 state=soh_fraction,
-                attributes={"friendly_name": f"Fox {sn} Battery State of Health", "unit_of_measurement": "*", "device_class": "battery", "state_class": "measurement", "icon": "mdi:battery-heart"},
+                attributes={"friendly_name": f"Fox {sn} Battery State of Health", "unit_of_measurement": "*", "state_class": "measurement", "icon": "mdi:battery-heart"},
                 app="fox",
             )
 

apps/predbat/tests/test_fox_api.py

@@ -5538,7 +5538,7 @@ def test_publish_data_battery_soh(my_predbat):
     assert soh_entity in fox.dashboard_items, f"battery_soh entity not found in {list(fox.dashboard_items.keys())}"
     assert fox.dashboard_items[soh_entity]["state"] == 0.95, f"Expected 0.95, got {fox.dashboard_items[soh_entity]['state']}"
     assert fox.dashboard_items[soh_entity]["attributes"]["unit_of_measurement"] == "*"
-    assert fox.dashboard_items[soh_entity]["attributes"]["device_class"] == "battery"
+    assert "device_class" not in fox.dashboard_items[soh_entity]["attributes"]
     assert fox.dashboard_items[soh_entity]["attributes"]["state_class"] == "measurement"
     assert fox.dashboard_items[soh_entity]["attributes"]["icon"] == "mdi:battery-heart"