fix(subscription): show expiry clock time (MSK) when under a day

- subscription_time_left: replace floor-div '23 ч.'/'мин.' branches with the
  concrete expiry timestamp when less than a full day remains
- add MSK_TIMEZONE (UTC+3) as display default; label time as '(МСК)'
- add shared subscription_status_text helper, use it in status menu,
  post-payment reply and dev confirmation instead of floor-rounded days
- tests: cover under-a-day clock format; fix stale to_thread mock

user_store.py

@@ -145,6 +145,8 @@ def init_db(db_path: str | None = None) -> None:
 TRIAL_DAYS = 3
 SUBSCRIPTION_MONTH_DAYS = 30  # Совместимость со старым dev-сценарием.
 SUBSCRIPTION_PRICE_STARS = 450
+# Время окончания подписки показываем по Москве (MSK = фиксированный UTC+3).
+MSK_TIMEZONE = datetime.timezone(datetime.timedelta(hours=3))
 SUBSCRIPTION_PLANS = {
     0: 1,
     1: 15,
@@ -183,7 +185,11 @@ def _days_until(sub: sqlite3.Row, now: datetime.datetime | None = None) -> int:
     return delta.days if delta.total_seconds() > 0 else -1
 
 
-def subscription_time_left(sub: sqlite3.Row, now: datetime.datetime | None = None) -> tuple[bool, int, str]:
+def subscription_time_left(
+    sub: sqlite3.Row,
+    now: datetime.datetime | None = None,
+    display_tz: datetime.timezone | None = None,
+) -> tuple[bool, int | str, str]:
     expires = _subscription_expires_at(sub)
     if expires is None:
         return False, 0, ""
@@ -194,9 +200,26 @@ def subscription_time_left(sub: sqlite3.Row, now: datetime.datetime | None = Non
         return False, 0, ""
     if seconds >= 86400:
         return True, seconds // 86400, "дн."
-    if seconds >= 3600:
-        return True, seconds // 3600, "ч."
-    return True, max(1, seconds // 60), "мин."
+    # Меньше суток — показываем конкретное время окончания вместо "N ч.".
+    display_tz = display_tz or MSK_TIMEZONE
+    stamp = (expires + datetime.timedelta(microseconds=1)).replace(tzinfo=datetime.timezone.utc)
+    return True, stamp.astimezone(display_tz).strftime("%d.%m.%Y %H:%M") + " (МСК)", ""
+
+
+def subscription_status_text(
+    sub: sqlite3.Row | None,
+    now: datetime.datetime | None = None,
+    display_tz: datetime.timezone | None = None,
+) -> str:
+    """Единый текст статуса подписки: дни (>= суток) или конкретное время (< суток)."""
+    if not sub:
+        return "Подписка закончилась"
+    active, value, unit = subscription_time_left(sub, now=now, display_tz=display_tz)
+    if not active:
+        return "Подписка закончилась"
+    if unit == "":
+        return f"Подписка активна\nЗакончится в {value}"
+    return f"Подписка активна\nЗакончится через {value} {unit}"
 
 def subscription_row(user_id: int, db_path: str | None = None) -> sqlite3.Row | None:
     with closing(connect(db_path)) as connection: