tuning ui and adding adaptive themeing to extension

backend/app/models/download.py

@@ -6,7 +6,7 @@ from sqlalchemy import String, Integer, Text, ForeignKey, BigInteger
 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
 
 
 class DownloadStatus:
@@ -79,10 +79,10 @@ class Download(Base, TimestampMixin):
             "error_message": self.error_message,
             "file_count": self.file_count,
             "total_size": self.total_size,
-            "started_at": self.started_at.isoformat() if self.started_at else None,
-            "completed_at": self.completed_at.isoformat() if self.completed_at else None,
+            "started_at": format_datetime(self.started_at),
+            "completed_at": format_datetime(self.completed_at),
             "metadata": self.metadata_,
-            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "created_at": format_datetime(self.created_at),
         }