Second-pass review notes for the shared-deck link flow (Cockatrice#7244):
- FlowWidget arrow-key navigation is opt-in via addNavigableWidget, so
combo/spin controls on the analytics flows keep their own arrow keys
- isConnectedTo and the open-deck/join-game preconditions compare the
configured server port alongside the host, so a same-host/different-port
link cannot resolve its share token or game id on the wrong instance
- the link sign-in dialog reuses an existing server entry's saved name
instead of renaming it to the raw hostname
- skipStartupAutoConnect is cleared once the launch chain connects, so a
later mid-session declined link cannot fire the startup fallback
- the plain-launch path of SingleInstanceManager no longer blocks on the
primary's ACK
- link- and server-supplied text is html-escaped in the confirm prompts and
shared-deck preview so markup cannot spoof the shown messages
