OPT-27 round 2: a kept tomorrow figure is bounded on both sides

Hold.stand_in(): day0 <= now < day0 + 3 h. A tomorrow sensor is asked with
day0 = the next midnight, so the upper bound alone was true all day and a
figure stood in at any hour. test_opt27.py covers daytime tomorrow outages.

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

goodwe_controller/app/solarfc.py

@@ -315,7 +315,9 @@ class Hold:
         day, at = rec
         if (now - at).total_seconds() <= FRESH_S and not as_today:
             return day, at, False
-        after_midnight = now < day0 + timedelta(hours=KEPT_UNTIL_H)
+        # Both sides: a tomorrow sensor is asked with day0 = the next
+        # midnight, which is in the future all day (round 2).
+        after_midnight = day0 <= now < day0 + timedelta(hours=KEPT_UNTIL_H)
         evening = _local_hour(now) >= BELL_TO_H and now < day0 + timedelta(
             days=1)
         if as_today: