Fix introduced on #15035 is over quoting headers.
Eg mails instead of user@example.com shown as user%40example.com
Eg names instead of First Last shown as First%20Last
Also we are spending some time quoting ids and roles without required.
Keep quote only on user name, initially had problem based on the discussion
https://github.com/open-webui/open-webui/discussions/14391
Also add space in safe characters, in order remove %20 from names.
96758176cc