Add a home-location box to the club detail page in the control panel

Setting a club's home ground here creates/updates the same events.Location
row (flagged is_home) that the club's own Teams > Locations page shows and
edits -- no separate sync step, it's the same record either way. Also
fixes the shared form_field templatetag: django-countries' CountryField
widget reports as "lazyselect", which fell through to a broken plain
text input instead of rendering as a dropdown.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R1gj3J1QPfP38XWpnpbFpy

controlpanel/forms.py

@@ -6,6 +6,7 @@ from waffle import get_waffle_flag_model
 
 from billing.models import DuePayment, Subscription, Tier, TierPrice
 from club.models import Club
+from events.models import Location
 
 from .services.admins import find_member_by_email
 
@@ -30,6 +31,21 @@ class ClubForm(forms.ModelForm):
         self.fields["slug"].required = False
 
 
+class HomeLocationForm(forms.ModelForm):
+    """Create or update the club's home ground -- this *is* an events.Location row
+    (flagged ``is_home``), the same one that shows up under the club's own
+    Teams > Locations page, so the two stay in sync by construction rather than
+    needing anything to keep them that way."""
+
+    class Meta:
+        model = Location
+        fields = ["name", "address", "city", "zip_code", "country"]
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields["country"].widget.attrs.update({"data-searchable": "true", "data-search-placeholder": _("Type a country to search...")})
+
+
 class ClubAdminForm(forms.Form):
     """Grant club-admin rights to an email address, creating the person if new."""