feat: v0.10.0 — right Jobs & Market pane (contracts accept/dispatch, market buy/sell/refuel with live previews); catalog + economy constants exposed in /api/state; shared applySnapshot for instant action feedback

lib/game/catalog.ts

@@ -36,3 +36,28 @@ export const FUEL_PRICE_PER_L = 0.8;
 
 // Fraction of the catalog price paid out when selling a plane (v0.8.0).
 export const SELL_FRACTION = 0.5;
+
+// Snapshot shape of one catalog entry in GET /api/state (v0.10.0): `model` is the
+// id used by buy/dispatch, `label` the display name — clients compute all market
+// previews (buy price, sell payout, refuel cost) from these + the economy constants.
+export interface CatalogEntry {
+  model: string;
+  label: string;
+  price: number;
+  maxFuel: number;
+  burnPerKm: number;
+  speedKmh: number;
+}
+
+// The catalog as a flat array, one entry per plane type — the single source of
+// truth for both the sim (PLANE_TYPES) and the client snapshot.
+export function catalogEntries(): CatalogEntry[] {
+  return Object.values(PLANE_TYPES).map((t) => ({
+    model: t.id,
+    label: t.name,
+    price: t.price,
+    maxFuel: t.maxFuel,
+    burnPerKm: t.burnPerKm,
+    speedKmh: t.speedKmh,
+  }));
+}