PICK SEA Sprint A: async sky→sea transition via WS room:sky_confirmed — TDD

- natus_save: group_send room:sky_confirmed after confirm (carries seat_role)
- consumer: sky_confirmed handler rebroadcasts to room group
- _notify_sky_confirmed() helper mirrors _notify_pick_sky_available
- sea_partial view: renders _sea_overlay.html partial for in-page injection (403 if not sky_confirmed)
- epic:sea_partial URL registered
- _natus_overlay.html: data-user-seat-role attr; _onSkyConfirmed() fetches sea partial,
  removes natus overlay + backdrop, injects sea HTML, toggles sea-open on html root;
  room:sky_confirmed WS listener calls _onSkyConfirmed only for matching seat role
- user_seat_role added to SKY_SELECT context
- FT: PickSeaAsyncTransitionTest (3 tests, ChannelsFunctionalTest) — sea overlay,
  natus gone, sea-open class — all green

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/epic/consumers.py

@@ -90,5 +90,8 @@ class RoomConsumer(AsyncJsonWebsocketConsumer):
     async def pick_sky_available(self, event):
         await self.send_json(event)
 
+    async def sky_confirmed(self, event):
+        await self.send_json(event)
+
     async def cursor_move(self, event):
         await self.send_json(event)

src/apps/epic/urls.py

@@ -27,4 +27,5 @@ urlpatterns = [
     path('room/<uuid:room_id>/tarot/deal', views.tarot_deal, name='tarot_deal'),
     path('room/<uuid:room_id>/natus/preview', views.natus_preview, name='natus_preview'),
     path('room/<uuid:room_id>/natus/save', views.natus_save, name='natus_save'),
+    path('room/<uuid:room_id>/sea/partial', views.sea_partial, name='sea_partial'),
 ]

src/apps/epic/views.py

@@ -126,6 +126,13 @@ def _notify_pick_sky_available(room_id):
     )
 
 
+def _notify_sky_confirmed(room_id, seat_role):
+    async_to_sync(get_channel_layer().group_send)(
+        f'room_{room_id}',
+        {'type': 'sky_confirmed', 'seat_role': seat_role},
+    )
+
+
 SLOT_ROLE_LABELS = {1: "PC", 2: "NC", 3: "EC", 4: "SC", 5: "AC", 6: "BC"}
 
 _SIG_SEAT_ORDERING = Case(
@@ -362,6 +369,7 @@ def _role_select_context(room, user):
         )
         sky_confirmed = confirmed_char is not None
         ctx["sky_confirmed"] = sky_confirmed
+        ctx["user_seat_role"] = _canonical_seat.role if _canonical_seat else ''
         if sky_confirmed:
             ctx["my_tray_sig"] = confirmed_char.significator
 
@@ -1093,5 +1101,19 @@ def natus_save(request, room_id):
         char.confirmed_at = timezone.now()
 
     char.save()
+
+    if char.is_confirmed:
+        _notify_sky_confirmed(room_id, seat.role)
+
     return JsonResponse({'id': char.id, 'confirmed': char.is_confirmed})
 
+
+@login_required
+def sea_partial(request, room_id):
+    """Return the rendered sea overlay partial for in-page injection after sky confirm."""
+    room = Room.objects.get(id=room_id)
+    ctx = _role_select_context(room, request.user)
+    if not ctx.get('sky_confirmed'):
+        return HttpResponse(status=403)
+    return render(request, 'apps/gameboard/_partials/_sea_overlay.html', ctx)
+