home-assistant: fix Jinja2 battery template syntax

The template used | min(100) | max(0) which is invalid Jinja2 syntax.
These filters expect iterables (lists), not scalar arguments. This
caused TypeError warnings on every MQTT message and left battery
sensors unavailable.

Fixed by using proper list-based min/max:
  [[[value, 100] | min, 0] | max

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/home-assistant/default.nix

@@ -78,15 +78,15 @@
         # Override battery calculation using voltage (mV): (voltage - 2100) / 9
         "0x54ef441000a547bd" = {
           friendly_name = "0x54ef441000a547bd";
-          homeassistant.battery.value_template = "{{ (((value_json.voltage | float) - 2100) / 9) | round(0) | int | min(100) | max(0) }}";
+          homeassistant.battery.value_template = "{{ [[(((value_json.voltage | float) - 2100) / 9) | round(0) | int, 100] | min, 0] | max }}";
         };
         "0x54ef441000a54d3c" = {
           friendly_name = "0x54ef441000a54d3c";
-          homeassistant.battery.value_template = "{{ (((value_json.voltage | float) - 2100) / 9) | round(0) | int | min(100) | max(0) }}";
+          homeassistant.battery.value_template = "{{ [[(((value_json.voltage | float) - 2100) / 9) | round(0) | int, 100] | min, 0] | max }}";
         };
         "0x54ef441000a564b6" = {
           friendly_name = "temp_server";
-          homeassistant.battery.value_template = "{{ (((value_json.voltage | float) - 2100) / 9) | round(0) | int | min(100) | max(0) }}";
+          homeassistant.battery.value_template = "{{ [[(((value_json.voltage | float) - 2100) / 9) | round(0) | int, 100] | min, 0] | max }}";
         };
 
         # Other sensors

services/monitoring/rules.yml

@@ -229,13 +229,13 @@ groups:
           summary: "Mosquitto not running on {{ $labels.instance }}"
           description: "Mosquitto has been down on {{ $labels.instance }} more than 5 minutes."
       - alert: zigbee_sensor_stale
-        expr: (time() - hass_last_updated_time_seconds{entity=~"sensor\\.(0x[0-9a-f]+|temp_server)_temperature"}) > 7200
+        expr: (time() - hass_last_updated_time_seconds{entity=~"sensor\\.(0x[0-9a-f]+|temp_server)_temperature"}) > 14400
         for: 5m
         labels:
           severity: warning
         annotations:
           summary: "Zigbee sensor {{ $labels.friendly_name }} is stale"
-          description: "Zigbee temperature sensor {{ $labels.entity }} has not reported data for over 2 hours. The sensor may have a dead battery or connectivity issues."
+          description: "Zigbee temperature sensor {{ $labels.entity }} has not reported data for over 4 hours. The sensor may have a dead battery or connectivity issues."
   - name: smartctl_rules
     rules:
       - alert: smart_critical_warning