improve(automation): increase reliability of tesla charging control

- Change mode to restart to prevent skipped runs
- Replace failsafe template trigger with time_pattern
- Add plugged-in condition to avoid unnecessary switching
- Add explicit deadline validation condition

Result:
- More reliable execution of charging logic
- Prevents missed failsafe activation
- Reduces unnecessary charger toggling

include/automations/tesla_charge_failsafe.yaml

@@ -1,12 +1,15 @@
 - alias: Tesla failsafe charge
   trigger:
-    - platform: template
+    - platform: time_pattern
+      minutes: "/5"
+
+  condition:
+    - condition: template
       value_template: >
         {% set deadline_ts = as_timestamp(states('input_datetime.tesla_charge_deadline')) %}
         {% set now_ts = as_timestamp(now()) %}
-        {{ (deadline_ts - now_ts) <= 3600 }}  # 1 time = 3600 sekunder
+        {{ (deadline_ts - now_ts) <= 3600 }}
 
-  condition:
     - condition: numeric_state
       entity_id: sensor.tesla_kwh_needed
       above: 0