Add AlertBanner and turnActions to replace duplicated markup and
wrappers, and share component-test setup.
Fixes: oversized dismiss, help, rules and skip-link text after the type
ramp collapse; report button hover styled as submit; chat draft lost
when the panel folds; resign/claim/kick styles leaking app-wide.
WordInput: the turn seed fires once per turn and is gated on the connection
(regression test for C6), a reconnect blip mid-turn does not reseed over
what the player typed, a rejection's suggestion fills the field on click,
and the player's own in-turn composition is left alone.
GameBoard: the chat pill renders only when onchatopen is passed, which is
the actual contract between the bot and online routes — a bot game simply
never passes it.
tiennm99