sky_natus_data: return stored sky_chart_data (preserves correct asc)

sky_save was re-fetching from PySwiss using sky_birth_dt, which was
stored as local time treated as UTC — giving a different (wrong) asc
than the chart computed by sky_preview. sky_natus_data then served this
wrong chart, rotating the applet wheel by the timezone offset.

Fix: sky_save stores body.get('chart_data') directly (client _lastChartData
is already enriched from sky_preview with correct UTC). sky_natus_data
returns the stored chart with fresh distinctions — no PySwiss call needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/dashboard/views.py

@@ -327,40 +327,19 @@ def sky_save(request):
 
     user = request.user
     birth_dt_str = body.get('birth_dt', '')
-    birth_dt_utc = None
     if birth_dt_str:
         try:
             naive = datetime.fromisoformat(birth_dt_str.replace('Z', '+00:00'))
             user.sky_birth_dt = naive if naive.tzinfo else naive.replace(
                 tzinfo=zoneinfo.ZoneInfo('UTC')
             )
-            birth_dt_utc = user.sky_birth_dt.astimezone(zoneinfo.ZoneInfo('UTC'))
         except ValueError:
             user.sky_birth_dt = None
     user.sky_birth_lat    = body.get('birth_lat')
     user.sky_birth_lon    = body.get('birth_lon')
     user.sky_birth_place  = body.get('birth_place', '')
     user.sky_house_system = body.get('house_system', 'O')
-
-    lat_str = body.get('birth_lat')
-    lon_str = body.get('birth_lon')
-    if birth_dt_utc and lat_str is not None and lon_str is not None:
-        try:
-            dt_iso = birth_dt_utc.strftime('%Y-%m-%dT%H:%M:%SZ')
-            resp = http_requests.get(
-                settings.PYSWISS_URL + '/api/chart/',
-                params={'dt': dt_iso, 'lat': str(lat_str), 'lon': str(lon_str)},
-                timeout=5,
-            )
-            resp.raise_for_status()
-            enriched = resp.json()
-            if 'elements' in enriched and 'Earth' in enriched['elements']:
-                enriched['elements']['Stone'] = enriched['elements'].pop('Earth')
-            user.sky_chart_data = enriched
-        except Exception:
-            user.sky_chart_data = body.get('chart_data')
-    else:
-        user.sky_chart_data = body.get('chart_data')
+    user.sky_chart_data   = body.get('chart_data')
 
     user.save(update_fields=[
         'sky_birth_dt', 'sky_birth_lat', 'sky_birth_lon',
@@ -372,27 +351,11 @@ def sky_save(request):
 @login_required(login_url="/")
 def sky_natus_data(request):
     user = request.user
-    if not user.sky_birth_lat or not user.sky_birth_lon or not user.sky_birth_dt:
+    if not user.sky_chart_data:
         return HttpResponse(status=404)
 
-    try:
-        utc_dt = user.sky_birth_dt.astimezone(zoneinfo.ZoneInfo('UTC'))
-        dt_iso = utc_dt.strftime('%Y-%m-%dT%H:%M:%SZ')
-        resp = http_requests.get(
-            settings.PYSWISS_URL + '/api/chart/',
-            params={
-                'dt': dt_iso,
-                'lat': str(user.sky_birth_lat),
-                'lon': str(user.sky_birth_lon),
-            },
-            timeout=5,
-        )
-        resp.raise_for_status()
-    except Exception:
-        return HttpResponse(status=502)
-
-    data = resp.json()
-    if 'elements' in data and 'Earth' in data['elements']:
-        data['elements']['Stone'] = data['elements'].pop('Earth')
-    data['distinctions'] = _compute_distinctions(data['planets'], data['houses'])
+    data = dict(user.sky_chart_data)
+    data['distinctions'] = _compute_distinctions(
+        data.get('planets', {}), data.get('houses', {})
+    )
     return JsonResponse(data)