feat(tesla): automate charge deadline to next morning

- Add daily automation to set tesla_charge_deadline at 07:00 next day (13:05 trigger)
- Add automation to update deadline when car is plugged in
- Ensures smart charging always has valid future window
- Eliminates manual deadline management

include/automations/tesla_deadline.yaml

@@ -0,0 +1,35 @@
+- alias: Tesla set charge deadline at 13:00
+  id: tesla_set_charge_deadline_daily
+  trigger:
+    - platform: time
+      at: "13:05:00"
+
+  action:
+    - service: input_datetime.set_datetime
+      target:
+        entity_id: input_datetime.tesla_charge_deadline
+      data:
+        datetime: >
+          {{ (now() + timedelta(days=1))
+             .replace(hour=7, minute=0, second=0, microsecond=0) }}
+
+  mode: single
+
+
+- alias: Tesla set charge deadline when plugged in
+  id: tesla_set_charge_deadline_on_plug
+  trigger:
+    - platform: state
+      entity_id: binary_sensor.snowywhite_charger
+      to: "on"
+
+  action:
+    - service: input_datetime.set_datetime
+      target:
+        entity_id: input_datetime.tesla_charge_deadline
+      data:
+        datetime: >
+          {{ (now() + timedelta(days=1))
+             .replace(hour=7, minute=0, second=0, microsecond=0) }}
+
+  mode: single