New multiplayerMatch.ts (MultiplayerMatch class) drives one round: syncs
ThemeGuessGame/OpponentView to a round:start payload, relays local
category assignments as round:progress, forwards opponent round:progress
to OpponentView, drives timerHud's countdown (submitting the local color
map as round:submit at expiry), and renders a two-column scoreboard on
round:reveal via computeMatchResult.
ThemeGuessGame gains an optional onCategoryAssigned?(id, hex) constructor
callback, invoked as the last step of applyColor.
timerHud's TimerHudOptions gains an optional onExpire?() callback on the
countdown variant, fired once when endsAt passes.
resultView.ts gains renderMultiplayerResult() for the two-column
you/opponent scoreboard + winner banner (equal overall -> explicit draw).
index.html/style.css: additive #mp-scoreboard/#mp-winner-banner/#mp-you-*/
#mp-opponent-* markup and .mp-* styles; existing single-player result
markup untouched aside from adding id="solo-score-meter-wrap" so it can
be toggled off during a multiplayer reveal.
Replace the single pick-a-theme-and-start intro modal with a three-section
menu (Solo/Private/Matchmaking). Solo keeps the existing gameplay reachable
via a direct Play button; Private (Enter Code/Create Room) and Matchmaking
(Find Match) are stubbed with console.log no-ops pending tickets #17/#15/#14.
main.ts gains a small showView(name) helper that toggles .hidden across the
menu/result overlay screens, keeping it a thin composition root.
Splits the single game.js god-class into layered modules (types, data,
engine, game, preview, ui, main) and converts every source file to
TypeScript, built and served by Vite instead of a plain static server.
No behavior change: verified against the previous JS version via a full
play-through (theme select, preview countdown, coloring, reveal) in a
real browser.
