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/calc.py

@@ -19,6 +19,14 @@ SIGN_ELEMENT = {
     'Cancer': 'Water', 'Scorpio': 'Water', 'Pisces': 'Water',
 }
 
+ASPECTS = [
+    ('Conjunction',  0,   8.0),
+    ('Sextile',     60,   6.0),
+    ('Square',      90,   8.0),
+    ('Trine',      120,   8.0),
+    ('Opposition', 180,  10.0),
+]
+
 PLANET_CODES = {
     'Sun':     swe.SUN,
     'Moon':    swe.MOON,
@@ -90,3 +98,33 @@ def get_element_counts(planets):
     counts['Space'] = max_seq - 1
 
     return counts
+
+
+def calculate_aspects(planets):
+    """Return a list of aspects between all planet pairs.
+
+    Each entry: {planet1, planet2, type, angle (actual, rounded), orb (rounded)}.
+    Only the first matching aspect type is reported per pair (aspects are
+    well-separated enough that at most one can apply with standard orbs).
+    """
+    names = list(planets.keys())
+    aspects = []
+    for i, name1 in enumerate(names):
+        for name2 in names[i + 1:]:
+            deg1 = planets[name1]['degree']
+            deg2 = planets[name2]['degree']
+            angle = abs(deg1 - deg2)
+            if angle > 180:
+                angle = 360 - angle
+            for aspect_name, target, max_orb in ASPECTS:
+                orb = abs(angle - target)
+                if orb <= max_orb:
+                    aspects.append({
+                        'planet1': name1,
+                        'planet2': name2,
+                        'type': aspect_name,
+                        'angle': round(angle, 2),
+                        'orb': round(orb, 2),
+                    })
+                    break
+    return aspects