fix(db): cast status to varchar in sync queue update for proper enum comparison

internal/database/queries.sql.go

@@ -7492,7 +7492,7 @@ SET
     status = $2,
     attempts = attempts + 1,
     error_message = $3,
-    processed_at = CASE WHEN $2 = 'completed' THEN NOW() ELSE NULL END
+    processed_at = CASE WHEN $2::varchar = 'completed' THEN NOW() ELSE NULL END
 WHERE id = $1
 RETURNING id, device_id, media_item_id, sync_type, sync_data, priority, attempts, max_attempts, status, error_message, created_at, processed_at
 `

internal/database/queries/queries.sql

@@ -812,7 +812,7 @@ SET
     status = $2,
     attempts = attempts + 1,
     error_message = $3,
-    processed_at = CASE WHEN $2 = 'completed' THEN NOW() ELSE NULL END
+    processed_at = CASE WHEN $2::varchar = 'completed' THEN NOW() ELSE NULL END
 WHERE id = $1
 RETURNING *;