feat(profile): add user self-service profile settings page and API

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

migrations/versions/034_add_user_profile_settings.py

@@ -0,0 +1,47 @@
+"""Add preferred_theme and avatar_data columns to user_profiles.
+
+Revision ID: 034_add_user_profile_settings
+Revises: 033_add_imap_ingestion_profiles
+Create Date: 2026-03-12
+"""
+
+from typing import Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "034_add_user_profile_settings"
+down_revision: Union[str, None] = "033_add_imap_ingestion_profiles"
+depends_on: Union[str, None] = None
+
+
+def upgrade() -> None:
+    """Add preferred_theme and avatar_data columns to user_profiles table."""
+    conn = op.get_bind()
+    inspector = sa.inspect(conn)
+    if "user_profiles" not in inspector.get_table_names():
+        return
+    existing_columns = {col["name"] for col in inspector.get_columns("user_profiles")}
+    if "preferred_theme" not in existing_columns:
+        op.add_column(
+            "user_profiles",
+            sa.Column("preferred_theme", sa.String(10), nullable=True, server_default=None),
+        )
+    if "avatar_data" not in existing_columns:
+        op.add_column(
+            "user_profiles",
+            sa.Column("avatar_data", sa.Text, nullable=True, server_default=None),
+        )
+
+
+def downgrade() -> None:
+    """Remove preferred_theme and avatar_data columns from user_profiles table."""
+    conn = op.get_bind()
+    inspector = sa.inspect(conn)
+    if "user_profiles" not in inspector.get_table_names():
+        return
+    existing_columns = {col["name"] for col in inspector.get_columns("user_profiles")}
+    if "avatar_data" in existing_columns:
+        op.drop_column("user_profiles", "avatar_data")
+    if "preferred_theme" in existing_columns:
+        op.drop_column("user_profiles", "preferred_theme")