sky: store birth_tz, prefill form from User model, drop localStorage

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

src/apps/dashboard/views.py

@@ -303,9 +303,12 @@ def sky_view(request):
     return render(request, "apps/dashboard/sky.html", {
         "preview_url": request.build_absolute_uri("/dashboard/sky/preview"),
         "save_url":    request.build_absolute_uri("/dashboard/sky/save"),
-        "saved_sky":   request.user.sky_chart_data,
+        "saved_sky":         request.user.sky_chart_data,
         "saved_birth_dt":    request.user.sky_birth_dt,
         "saved_birth_place": request.user.sky_birth_place,
+        "saved_birth_lat":   request.user.sky_birth_lat,
+        "saved_birth_lon":   request.user.sky_birth_lon,
+        "saved_birth_tz":    request.user.sky_birth_tz,
         "page_class":  "page-sky",
     })
 
@@ -338,12 +341,13 @@ def sky_save(request):
     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_birth_tz     = body.get('birth_tz', '')
     user.sky_house_system = body.get('house_system', 'O')
     user.sky_chart_data   = body.get('chart_data')
 
     user.save(update_fields=[
         'sky_birth_dt', 'sky_birth_lat', 'sky_birth_lon',
-        'sky_birth_place', 'sky_house_system', 'sky_chart_data',
+        'sky_birth_place', 'sky_birth_tz', 'sky_house_system', 'sky_chart_data',
     ])
     return JsonResponse({"saved": True})
 

src/apps/lyric/migrations/0019_sky_birth_tz.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0 on 2026-04-22 01:39
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('lyric', '0018_user_sky_fields'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='user',
+            name='sky_birth_tz',
+            field=models.CharField(blank=True, max_length=64),
+        ),
+    ]

src/apps/lyric/models.py

@@ -52,6 +52,7 @@ class User(AbstractBaseUser):
     sky_birth_lat   = models.DecimalField(max_digits=9, decimal_places=4, null=True, blank=True)
     sky_birth_lon   = models.DecimalField(max_digits=9, decimal_places=4, null=True, blank=True)
     sky_birth_place = models.CharField(max_length=255, blank=True)
+    sky_birth_tz    = models.CharField(max_length=64,  blank=True)
     sky_house_system = models.CharField(max_length=1, blank=True, default="O")
     sky_chart_data  = models.JSONField(null=True, blank=True)