Preflight checklist

• I have searched the issue tracker for a bug report that matches the one I want to file, without success.
• I have searched the features list for this feature, and I couldn't find it.
• I have checked that I'm using the latest stable version of the app.

Problem Description

I'm using miru quite often to watch anime with friends and this start pissing me off because i sometimes forget about such "limitations".

So there's 2 problems with sync i noticed.

1. When someone joining w2g lobby and you already watching/having open some torrent it sync only on selecting different torrent and selecting old back.
2. When opening batch torrent and it's locally automatically select N episode because you a logged in anilist it's not synced to anonymous peers so we have inconsistent episode number among participants. When watching with someone logged in and you on same episode it works okay because of local autoselect.

Proposed Solution

1. Send current media state on "init".
2. Send "index" on autoselect.