Cannot login to servers that use Matrix Authentication Service with an upstream OIDC provider

[thefinn93]

Describe the bug

When I try to use Cinny with my Matrix server, I'm unable to login:

Reproduction

1. Visit https://app.cinny.in
2. Enter the domain of a Matrix server that uses MAS with an upstream OIDC provider and no password auth. devhack.net is an example of such a server.

Expected behavior

An OIDC login button is shown

Platform and versions

OS: Debian 12
Browser: Firefox 
Cinny: v4.1.0

Additional context

This server works fine with Element and FluffyChat.

[tulir]

https://github.com/cinnyapp/cinny/blob/dev/src/app/hooks/useParsedLoginFlows.ts#L10-L12 looks like cinny requires identity_providers to be present, but according to the spec, those fields are not required