- frontend: use e.message instead of String(e) in toErrorResult to avoid
"Error: " prefix for HTTP-mode errors, matching connectionErrorMessage
- frontend: apply same fix to MongoDocBrowser error display
- backend(postgres): use pg_error_to_string across all query execution
paths (execute, execute_batch, copy_out, copy_in) to extract DbError
details instead of generic transport-layer errors
Other databases (MySQL, SQL Server, SQLite, DuckDB) already include
server-level error details in their native Error::to_string().
t8y2
dafed47b07