Stop sending the Minecraft access token to the Saturn server. The
connect loop now:
1. fetches GET /versions and compares this client's mod version:
supported -> connect; deprecated -> warn, connect; neither -> warn,
don't connect (warnings are shown once per status change)
2. requests auth_challenge with the username to get a server id
3. calls Mojang's session `join` with the access token and server id
(the token only goes to Mojang); a refused token gives up
4. requests auth_verify, which the server confirms with `hasJoined`
Add SaturnProvider.getModVersion() and showWarning() for the version
check and its toast.
Refs saturnclientmc/saturnclient#7
Co-Authored-By: Claude Opus 5.5 <[email protected]>
selimaj-devandclaude