feat(codes): mark a code dead once the owner confirms it in game

Game8 still lists Y1INABQB6DEX, 2BJ64QRZ7RT8 and PLDXIB886Y1S as active
Genshin codes after the game refused them. CODE_CHECKS records the
owner's in-game check; build-codes stamps the matching code confirmedDead,
and the Codes tab shows it expired: "Confirmed expired in game, 2026-10-20."

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

src/client/components/redesign/CodesPage.tsx

@@ -69,13 +69,15 @@ export function CodesPage({
         </button>
         {c.reward && <p>{c.reward}</p>}
         <small>
-          {codeExpired(c, now)
-            ? "Expired"
-            : c.expiresAt
-              ? `Expires ${formatInZone(c.expiresAt, true, typeof state.prefs.timezone === "string" ? state.prefs.timezone : null)}`
-              : c.expiresOn
-                ? `Expires on ${c.expiresOn} (time not stated)`
-                : "Expiry not announced"}{" "}
+          {c.confirmedDead
+            ? `Confirmed expired in game, ${c.confirmedDead}.`
+            : codeExpired(c, now)
+              ? "Expired"
+              : c.expiresAt
+                ? `Expires ${formatInZone(c.expiresAt, true, typeof state.prefs.timezone === "string" ? state.prefs.timezone : null)}`
+                : c.expiresOn
+                  ? `Expires on ${c.expiresOn} (time not stated)`
+                  : "Expiry not announced"}{" "}
           ·{" "}
           <a href={c.sourceUrl} target="_blank" rel="noreferrer">
             Source

src/client/state/reader/codes.ts

@@ -11,9 +11,11 @@ export function newCodes(
  * Whether a code's stated expiry has passed. A date with no time ("Expires on
  * 2026-10-20") counts as passed only once that date has ended everywhere, at
  * 12:00 UTC the next day, so a code is never shown expired while it may
- * still redeem somewhere.
+ * still redeem somewhere. A code the owner confirmed dead in game is expired
+ * whatever it states.
  */
 export function codeExpired(code: RedeemCode, now: number): boolean {
+  if (code.confirmedDead) return true;
   if (code.expiresAt) return Date.parse(code.expiresAt) <= now;
   if (code.expiresOn)
     return Date.parse(`${code.expiresOn}T00:00:00Z`) + 36 * 3600_000 <= now;