A refused resume now leaves the room instead of showing a banner over a
dead board, and /play offers a fresh game there. Entering /play forgets
any stored token so it no longer races StartBotGame. An eliminated
player who reconnects stays a spectator. Held lobby actions wait for the
resume's RoomState; leaving while offline is not held. Chat clears its
draft only when the line was sent and cannot send while offline.
Also: away banners no longer announce every second; game over does not
steal focus from the chat field; the clock offset uses the lowest-RTT
pong; the history export numbers a resumed chain from its real length;
chat replay keeps existing ordinals; one .primary button class replaces
five copies; the footer links the data change list; the online heading
joins the type ramp. New component, connection and storage-guard tests.
