tuning ui and adding adaptive themeing to extension

backend/app/models/subscription.py

@@ -6,7 +6,7 @@ from sqlalchemy import String, Boolean, Integer, Text
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
-from app.models.base import Base, TimestampMixin
+from app.models.base import Base, TimestampMixin, format_datetime
 
 if TYPE_CHECKING:
     from app.models.source import Source
@@ -64,8 +64,8 @@ class Subscription(Base, TimestampMixin):
             "metadata": self.metadata_,
             "platform_count": self.platform_count,
             "enabled_source_count": self.enabled_source_count,
-            "created_at": self.created_at.isoformat() if self.created_at else None,
-            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+            "created_at": format_datetime(self.created_at),
+            "updated_at": format_datetime(self.updated_at),
         }
         if include_sources and self.sources:
             result["sources"] = [s.to_dict(include_subscription=False) for s in self.sources]