Honor auto_archive in the reminder email subject and the trial form

Two gaps found while checking whether auto_archive is honored
end-to-end (archive_overdue_clubs and the on-screen banner already
got it right):

- reminder_subject.txt branched only on notice.level, so a club with
  auto_archive off -- one that will NEVER be archived -- still got
  "Action required: X is about to be archived" as its subject line,
  contradicting the correctly-worded body underneath. Now gated on
  notice.level == 'error' AND notice.will_archive.
- TrialForm had no auto_renew/auto_archive fields at all, so a trial
  could only ever be started on the service defaults (both True).
  The only way to change either afterwards was "Change plan", which
  ends the trial as a side effect. Added both, matching
  SubscriptionForm's existing pair.

controlpanel/forms.py

@@ -140,6 +140,11 @@ class TrialForm(forms.Form):
     trial_plan = forms.ModelChoiceField(queryset=Plan.objects.none(), label=_("Trial plan"), help_text=_("What this club is billed on during the trial. Its length is the plan's own duration."))
     post_trial_plan = forms.ModelChoiceField(queryset=Plan.objects.none(), label=_("Then switch to"), help_text=_("The plan it lands on automatically once the trial ends."))
     start = forms.DateField(required=False, widget=forms.DateInput(attrs={"type": "date"}), label=_("Trial starts"), help_text=_("Left blank, the trial starts today."))
+    # Same two switches SubscriptionForm offers. Without them here a trial could only be
+    # started on the defaults, and the only way to change them afterwards is the "Change
+    # plan" modal -- which ends the trial as a side effect.
+    auto_renew = forms.BooleanField(required=False, initial=True, label=_("Auto renew"), help_text=_("Issue the next period automatically before this one ends."))
+    auto_archive = forms.BooleanField(required=False, initial=True, label=_("Auto archive"), help_text=_("Archive this club when a period goes unpaid past its grace period."))
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)

controlpanel/tests.py

@@ -1502,7 +1502,10 @@ class TrialPanelTests(ControlPanelTestBase):
         PlanPrice.objects.create(plan=self.plan, active_from=self.today - datetime.timedelta(days=1200), amount=Decimal("500.00"))
 
     def start_trial(self, **data):
-        data = {"trial_plan": self.trial_plan.pk, "post_trial_plan": self.plan.pk, "start": ""} | data
+        # "on" for both, matching how a freshly opened modal actually renders: unbound,
+        # TrialForm's auto_renew/auto_archive are initial=True, so a real submission that
+        # never touches either checkbox posts them checked.
+        data = {"trial_plan": self.trial_plan.pk, "post_trial_plan": self.plan.pk, "start": "", "auto_renew": "on", "auto_archive": "on"} | data
         return self.client.post(reverse("controlpanel:club_trial_start", args=[self.club.pk]), data)
 
     def test_starting_a_trial_opens_a_short_first_period(self):
@@ -1541,6 +1544,18 @@ class TrialPanelTests(ControlPanelTestBase):
         self.assertContains(response, "On trial")
         self.assertContains(response, "Standard")
 
+    def test_a_trial_can_be_started_with_auto_archive_off(self):
+        # Same switch SubscriptionForm offers -- a trial must be able to opt out of
+        # auto-archiving too, not just a paid subscription.
+        self.start_trial(auto_archive="")
+
+        self.assertFalse(self.club.subscription.auto_archive)
+
+    def test_a_trial_defaults_to_auto_archive_on(self):
+        self.start_trial()
+
+        self.assertTrue(self.club.subscription.auto_archive)
+
     def test_manually_changing_plan_mid_trial_clears_the_trial(self):
         self.start_trial()
         other = Plan.objects.create(name="Other")

controlpanel/views.py

@@ -550,6 +550,8 @@ class ClubStartTrialView(PlatformStaffRequiredMixin, RedirectOnInvalidMixin, For
                 trial_plan,
                 post_trial_plan=form.cleaned_data["post_trial_plan"],
                 start=form.cleaned_data.get("start"),
+                auto_renew=form.cleaned_data["auto_renew"],
+                auto_archive=form.cleaned_data["auto_archive"],
             )
             notify(self.request, f"s|Trial started|{club} is on a {trial_plan.duration_months}-month trial of {trial_plan}, then switches to {form.cleaned_data['post_trial_plan']}.")