Make the management week calendar cover the full 24 hours

DEFAULT_DAY_START_HOUR/DEFAULT_DAY_END_HOUR only widened the grid's
default 08:00-22:00 window for an event outside it, on whichever end
that event fell on -- so a single early-morning event (e.g. one starting
at midnight) widened the start but left the end clipped at 22:00 rather
than covering the full day. Default the window to the full day (0-24)
instead; the same expansion logic still guards a pathological
almost-midnight-ending event, it just never needs to trigger anymore.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ECGMEwrc2k4D8VQuwjstj9

events/services/calendar.py

@@ -19,10 +19,13 @@ import datetime
 
 from django.utils import timezone
 
-#: The week grid's default visible hours -- expanded automatically (see week_grid)
-#: if an event falls outside it, so nothing is ever clipped out of view.
-DEFAULT_DAY_START_HOUR = 8
-DEFAULT_DAY_END_HOUR = 22
+#: The week grid's visible hours -- the full day, always, so nothing is ever
+#: scrolled out of view regardless of what time events happen to fall at (this
+#: used to default to a narrower 08:00-22:00 window, only widening for events
+#: outside it -- a very early or very late one still left the grid clipped at
+#: the other end, e.g. midnight..22:00 rather than the full day).
+DEFAULT_DAY_START_HOUR = 0
+DEFAULT_DAY_END_HOUR = 24
 
 #: Floor on a block's rendered height, in percent of the visible hour span -- a very
 #: short event (a 15-minute weigh-in) would otherwise render as a sliver too thin to