* [Client] Send game invites from the user context menu via a private message
The user context menu gains an "Invite to Game" submenu listing the
inviteable games in the room (the inviter's own games, honoring the
buddy-only setting). Picking one opens a private message to the target
user with a cockatrice://joingame link naming the game, so the target
gets a clickable invite instead of a raw URL. Multi-game rooms offer a
picker; a single inviteable game sends directly. Sending a message to
an offline user no longer swallows the draft — it reports that the
user is offline and keeps the typed text.
Took 1 minute
* [Client] Add invite-to-game dialog to the game window
Took 15 seconds
* [Client] Open the invite dialog taller by default without enforcing a minimum size
* Move button to bottom
Took 3 minutes
* Address comments.
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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
