Complete S7 priced-line nudge: freshness on a long-open page + reversible gate

REPORT-FIRST correction. This order's premise — "S7 is a shell that doesn't
update per selection" — is not what the code does. pricedForSelection is a
useMemo on [pricedIndex, selectedPlayer, stat] and setSelectedPlayer/setStat
fire on every user pick, so the chips already update per selection, and the
prior session's verification of that stands. The genuine gap was FRESHNESS: the
snapshot fetch depended on [sport] only, so pricedIndex was fetched once per
sport-change and never refreshed. The pricing cron re-prices at five UTC hours,
so a scanner left open across a cron boundary surfaced hour-stale priced lines.
That is the real defect, and the only one fixed.

FRESHNESS. The fetch is now a refreshPriced callback re-run when the held
snapshot is older than PRICED_STALE_MS (30s, matching the /api/snapshot cache)
at the moment of use — on selection change and on window focus — so a long-open
page never shows a stale line. Sport change still clears the index first, so the
old sport's lines never flash.

STALE-TAP was already safe and is unchanged: the scan submit re-fetches the live
snapshot server-side, so a chip that's gone stale between render and tap either
lands on a real triplet (still priced) or degrades to the honest empty state
(rotated away) — proven in the prior session and re-confirmed here (an
off-snapshot line returns no market and shows the empty state).

REVERSIBLE GATE. The whole nudge sits behind one PRICED_NUDGE_ENABLED flag: false
empties the surfaced set, so the scanner falls back to S6's link-only empty
state with the chips gone. Shipping enabled only after the cases are proven this
session; the flag is the instant revert lever.

DISPLAY-LAYER ONLY. Only scan/page.tsx changed. GradeResultCard, PriceTriplet,
gradeAdapter, valueState, both scan routes and the pure pricedLines helper are
byte-identical — Scan A and the scan-submit resolution are untouched, and the
change is independently revertible.

Tests 3765 passed / 303 suites, web build exit 0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCNgGSt5qvcLxaeQqa7Zpj

web/src/app/scan/page.tsx

@@ -119,6 +119,13 @@ const SPORT_ACCENT: Record<Sport, string> = {
 // Sportsbook deep-links — A1 S3: built by lib/bookLinks (organic until the
 // affiliate config flips a book on). rel is BOOK_LINK_REL on every anchor.
 
+// Session 80 — PRICED-LINE NUDGE gate + freshness. The flag is the reversibility
+// lever: false → the nudge disappears and the scanner falls back to S6's
+// link-only empty state (Scan A / the working triplet are untouched either way).
+// STALE_MS matches /api/snapshot's 30s cache — no point re-fetching more often.
+const PRICED_NUDGE_ENABLED = true;
+const PRICED_STALE_MS = 30_000;
+
 export default function ScanPage() {
   const router = useRouter();
   const { user, session, tier, scansRemaining, canScan, loading: authLoading, bumpScanCount } = useAuth();
@@ -141,6 +148,9 @@ export default function ScanPage() {
   // Session 79 — the CURRENT snapshot's priced lines, indexed by player+stat, so
   // a marketless scan can surface REAL priced lines (never suggested/nearest).
   const [pricedIndex, setPricedIndex] = useState<Map<string, PricedLine[]> | null>(null);
+  // Session 80 — freshness clock: when the held snapshot was last fetched, so a
+  // long-open scanner re-fetches instead of surfacing hour-stale priced lines.
+  const [pricedFetchedAt, setPricedFetchedAt] = useState(0);
   // One-tap re-scan of a surfaced priced line: bump this to re-run runScan AFTER
   // line/direction state has committed.
   const [rescanKey, setRescanKey] = useState(0);
@@ -159,7 +169,8 @@ export default function ScanPage() {
   // Session 79 — the REAL priced lines for the EXACT selected player+stat. Empty
   // for a player/stat the board didn't price — never suggested or interpolated.
   const pricedForSelection = useMemo(
-    () => (pricedIndex && selectedPlayer && stat ? pricedLinesFor(pricedIndex, selectedPlayer, stat) : []),
+    () => (PRICED_NUDGE_ENABLED && pricedIndex && selectedPlayer && stat
+      ? pricedLinesFor(pricedIndex, selectedPlayer, stat) : []),
     [pricedIndex, selectedPlayer, stat],
   );
 
@@ -192,22 +203,47 @@ export default function ScanPage() {
     };
   }, [sport]);
 
-  // Session 79 — index the current snapshot's priced lines for the surfacer.
-  // /api/snapshot is public + cached 30s and is re-validated server-side at
-  // scan time, so a surfaced line that goes stale degrades to the honest empty
-  // state on tap rather than a vanishing triplet.
-  useEffect(() => {
-    let cancelled = false;
-    setPricedIndex(null);
+  // Session 79/80 — index the current snapshot's priced lines for the surfacer,
+  // kept FRESH. /api/snapshot is public + 30s-cached and re-validated
+  // server-side at scan time (so a stale chip that's tapped degrades to the
+  // honest empty state, never a vanishing triplet). The display is kept current
+  // by re-fetching when it's older than PRICED_STALE_MS at the moment of use —
+  // on selection change and on window focus — so a long-open page never shows
+  // an hour-stale priced line.
+  const refreshPriced = useCallback(() => {
+    if (!PRICED_NUDGE_ENABLED) return;
     fetch(`/api/snapshot/${sport.toLowerCase()}`)
       .then((r) => (r.ok ? r.json() : null))
       .then((data: { grades?: unknown[] } | null) => {
-        if (!cancelled) setPricedIndex(indexPricedLines((data && data.grades) || []));
+        setPricedIndex(indexPricedLines((data && data.grades) || []));
+        setPricedFetchedAt(Date.now());
       })
-      .catch(() => !cancelled && setPricedIndex(new Map()));
-    return () => { cancelled = true; };
+      .catch(() => { setPricedIndex(new Map()); setPricedFetchedAt(Date.now()); });
   }, [sport]);
 
+  // Sport change: clear (never show the old sport's lines) then fetch fresh.
+  useEffect(() => {
+    setPricedIndex(null);
+    setPricedFetchedAt(0);
+    refreshPriced();
+  }, [refreshPriced]);
+
+  // Selection change: re-fetch only if the held snapshot has gone stale, so the
+  // chips shown for the new selection come from current data, not a mount copy.
+  useEffect(() => {
+    if (!selectedPlayer) return;
+    if (Date.now() - pricedFetchedAt > PRICED_STALE_MS) refreshPriced();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [selectedPlayer, stat]);
+
+  // Long-open page returning to focus: refresh if stale.
+  useEffect(() => {
+    const onFocus = () => { if (Date.now() - pricedFetchedAt > PRICED_STALE_MS) refreshPriced(); };
+    window.addEventListener('focus', onFocus);
+    return () => window.removeEventListener('focus', onFocus);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [pricedFetchedAt]);
+
   // Session 19 — fetch tonight's players from the odds proxy. The
   // odds endpoint returns the canonical list of players who have
   // props posted, which is exactly what the scan UI should surface