No-shows on the desktop member page, coach event screens, "+" popup polish

- management member_detail.html's Attendance card now shows the same
  No-shows count as the mobile player sheet, and the card's content (sparkline
  + tiles) fills the card's height/width instead of sitting in the top-left
  corner -- same flex-1/justify-center + stretched-tiles fix used there.
- Coach mode's Attendance and Line-up screens (opening an event) now
  highlight the Schedule tab instead of Today -- that's the calendar-icon
  tab, and where a coach reaches either from CoachScheduleView's own rows.
- The tab bar's "+" button: rotates 45° into an "×" while its popup is open
  (icon reused via CSS transform, no icon swap needed), the popup sits a
  little higher above the button (mb-3 -> mb-5), and a dark backdrop now
  covers the content behind it so the popup stands out.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

mobile/coach_views.py

@@ -187,7 +187,7 @@ class CoachAttendanceView(CoachScopeMixin, LoginRequiredMixin, TemplateView):
 
     template_name = "mobile/coach/attendance.html"
     screen_title = _("Attendance")
-    active_tab = "coach_today"
+    active_tab = "coach_schedule"
 
     #: ?filter= values this screen understands -- anything else (including no
     #: param) means "Responded" (IN_STATUSES: present/selected/maybe), the
@@ -606,7 +606,7 @@ class CoachLineupView(CoachScopeMixin, LoginRequiredMixin, TemplateView):
 
     template_name = "mobile/coach/lineup.html"
     screen_title = _("Line-up")
-    active_tab = "coach_today"
+    active_tab = "coach_schedule"
 
     def get_event(self):
         if self.active_team is None: