PICK SKY overlay: D3 natal wheel, Character model, PySwiss aspects+tz

PySwiss:
- calculate_aspects() in calc.py (conjunction/sextile/square/trine/opposition with orbs)
- /api/tz/ endpoint (timezonefinder lat/lon → IANA timezone)
- aspects included in /api/chart/ response
- timezonefinder==8.2.2 added to requirements
- 14 new unit tests (test_calc.py) + 12 new integration tests (TimezoneApiTest, aspect fields)

Main app:
- Sign, Planet, AspectType, HouseLabel reference models + seeded migrations (0032–0033)
- Character model with birth_dt/lat/lon/place, house_system, chart_data, celtic_cross,
  confirmed_at/retired_at lifecycle (migration 0034)
- natus_preview proxy view: calls PySwiss /api/chart/ + optional /api/tz/ auto-resolution,
  computes planet-in-house distinctions, returns enriched JSON
- natus_save view: find-or-create draft Character, confirmed_at on action='confirm'
- natus-wheel.js: D3 v7 SVG natal wheel (elements pie, signs, houses, planets, aspects,
  ASC/MC axes); NatusWheel.draw() / redraw() / clear()
- _natus_overlay.html: Nominatim place autocomplete (debounced 400ms), geolocation button
  with reverse-geocode city name, live chart preview (debounced 300ms), tz auto-fill,
  NVM / SAVE SKY footer; html.natus-open class toggle pattern
- _natus.scss: Gaussian backdrop+modal, two-column form|wheel layout, suggestion dropdown,
  portrait collapse at 600px, landscape sidebar z-index sink
- room.html: include overlay when table_status == SKY_SELECT

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

pyswiss/apps/charts/views.py

@@ -1,11 +1,13 @@
 from datetime import datetime, timezone
 
 from django.http import HttpResponse, JsonResponse
+from timezonefinder import TimezoneFinder
 
 import swisseph as swe
 
 from .calc import (
     DEFAULT_HOUSE_SYSTEM,
+    calculate_aspects,
     get_element_counts,
     get_julian_day,
     get_planet_positions,
@@ -61,10 +63,41 @@ def chart(request):
         'planets': planets,
         'houses': houses,
         'elements': get_element_counts(planets),
+        'aspects': calculate_aspects(planets),
         'house_system': house_system,
     })
 
 
+_tf = TimezoneFinder()
+
+
+def timezone_lookup(request):
+    """GET /api/tz/ — resolve IANA timezone string from lat/lon.
+
+    Query params: lat (float), lon (float)
+    Returns: { "timezone": "America/New_York" }
+    Returns 404 JSON { "timezone": null } if coordinates fall in international
+    waters (no timezone found) — not an error, just no result.
+    """
+    lat_str = request.GET.get('lat')
+    lon_str = request.GET.get('lon')
+
+    if lat_str is None or lon_str is None:
+        return HttpResponse(status=400)
+
+    try:
+        lat = float(lat_str)
+        lon = float(lon_str)
+    except ValueError:
+        return HttpResponse(status=400)
+
+    if not (-90 <= lat <= 90) or not (-180 <= lon <= 180):
+        return HttpResponse(status=400)
+
+    tz = _tf.timezone_at(lat=lat, lng=lon)
+    return JsonResponse({'timezone': tz})
+
+
 def charts_list(request):
     date_from_str = request.GET.get('date_from')
     date_to_str = request.GET.get('date_to')