feat(codes): redeemed and expired codes move below, and new codes are marked

A game's Codes tab lists the codes still to use first; a code redeemed on
every server played, or past its stated expiry, is greyed in a "Redeemed or
expired" section below. A date-only expiry passes once that date has ended
everywhere. Settings → Your games marks a followed game with its count of
unseen, still usable codes until its Codes tab is opened.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/client/ReaderApp.tsx

@@ -993,6 +993,7 @@ function ReaderContent({
                 {page === "settings" && (
                   <SettingsLayout
                     state={state}
+                    codes={codes}
                     game={codesGame}
                     page={settingsPage}
                     onPage={(p) => {