fix(template): correct and simplify tesla_charge_now logic

- Convert tesla_charge_now to binary_sensor
- Replace strptime with as_timestamp for robust time parsing
- Fix hour alignment (remove 15-min slot mismatch)
- Implement proper deadline filtering using timestamps
- Simplify template to minimal, readable logic

Result:
- Accurate identification of cheapest charging hours
- Eliminates false negatives in charge scheduling

include/templates/tesla_smart_charge.yaml

@@ -1,17 +1,29 @@
-sensor:
+binary_sensor:
   - name: tesla_charge_now
     state: >
-      {% set deadline = states('input_datetime.tesla_charge_deadline') | default('2026-12-31T23:59:59') %}
+      {% set deadline_raw = states('input_datetime.tesla_charge_deadline') %}
-      {% set hours_needed = states('sensor.tesla_charge_hours_needed')|float(0)|round(0,'ceil') %}
+      {% set deadline_ts = as_timestamp(deadline_raw) if deadline_raw not in ['unknown','unavailable',''] else none %}
-      {% set prices = (state_attr('sensor.energidataservice','today') or []) + (state_attr('sensor.energidataservice','tomorrow') or []) %}
+
+      {% set hours_needed = states('sensor.tesla_charge_hours_needed') | float(0) | round(0, 'ceil') %}
+
+      {% set prices = (state_attr('sensor.energidataservice','today') or [])
+                      + (state_attr('sensor.energidataservice','tomorrow') or []) %}
+
+      {# Filter valid price entries and apply deadline #}
       {% set valid = [] %}
-      {% for p in prices if as_timestamp(strptime(p.hour,'%Y-%m-%dT%H:%M:%S')) <= as_timestamp(deadline) %}
+      {% for p in prices %}
-        {% set valid = valid + [p] %}
+        {% if p.hour is defined and p.hour %}
+          {% set ts = as_timestamp(p.hour) %}
+          {% if not deadline_ts or ts <= deadline_ts %}
+            {% set valid = valid + [p] %}
+          {% endif %}
+        {% endif %}
       {% endfor %}
-      {# Sorter efter pris #}
+
-      {% set sorted = valid | sort(attribute='price') %}
+      {# Pick cheapest hours #}
-      {# Vælg de billigste slots der dækker ladetiden #}
+      {% set cheapest = (valid | sort(attribute='price'))[:hours_needed] %}
-      {% set cheapest = sorted[:hours_needed] %}
+
-      {# Tjek om nuværende slot er i listen #}
+      {# Current hour #}
-      {% set now_slot = now().replace(minute=(now().minute//15)*15, second=0, microsecond=0).isoformat() %}
+      {% set now_slot = now().replace(minute=0, second=0, microsecond=0).isoformat() %}
+
       {{ cheapest | selectattr('hour','equalto',now_slot) | list | count > 0 }}