fix(sports): scroll and Vegas cards name the printed date's own weekday (#747)

With scroll_card.date_format "weekday", a Friday 8 PM ET game read
"Sat Oct 2" on the scroll and Vegas cards.

Cause: the extractor prints the "M/D" in the plugin's resolved zone (its
own setting, then the global one, then the system zone), but the card is
handed only the plugin's config. Its timezone ships as "", so
card_tzinfo fell back to UTC and the weekday belonged to the UTC date:
the next day for evening games in the Americas, the previous day for
morning games east of UTC (Auckland, Kiritimati).

Fix: every zone is within a day of UTC, so the printed date is the
start's UTC date or a neighbour of it. _format_date_as now takes the game
and names the weekday of whichever of those days has the printed month
and day, falling back to the zone-based weekday only when the start
cannot place the date (no offset, unparseable, or more than a day away).
The switch-mode scorebug shares the formatter and passes the game too, so
the twins stay identical; it already used the resolved zone and draws
what it drew before. Public signatures are unchanged.

Tests cover US DST end, New Year's Eve, both sides of the date line, NZ
DST start and UTC+14. The twins test's weekday pin is updated: the drawn
date now agrees, and only the bare weekday helpers still differ.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/common/sports_shared.py

@@ -360,14 +360,16 @@ class SportsCoreSharedMixin:
         The formatting is sports_card's. What differs from the card's
         ``format_game_date`` is passed in: the setting (``switch_date_format``,
         see :meth:`_switch_date_format`) and the weekday, which comes from
-        :meth:`_weekday_for` and so from this plugin's resolved timezone.
+        :meth:`_weekday_for` and so from this plugin's resolved timezone
+        when the game's start cannot place the printed date. The game goes
+        in too, so both formatters name the printed date's own weekday.
         """
         raw = str(date_text or "").strip()
         if not raw:
             return raw
         return _card._format_date_as(self._switch_date_format(), raw,
                                      lambda: self._weekday_for(game),
-                                     self._MONTH_ABBR)
+                                     self._MONTH_ABBR, game=game)
 
     def _weekday_for(self, game: Optional[Dict]) -> str:
         """Weekday abbreviation from the game's start time, or ''."""