Missing functionality

The old Godot daccord client's space context menu has a one-tap Copy Server Link action. In the new Flutter client the copy capability exists but is buried — you must open the full invite-management dialog to reach it (_copy() in lib/features/spaces/views/accord_invites.dart:154).

What's needed

• A "Copy server link" / "Copy invite link" tile in the space context menu (_serverActionTiles in lib/features/spaces/views/accord_home_rail.dart), permission-gated on createInvites.
• Reuse the existing invite-copy logic rather than duplicating it.

Found while auditing the old client's space menu for feature parity.

Migrated from DaccordProject/daccord-app#76