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/state.ts

@@ -2,7 +2,7 @@ import { loadAirportsGeoJson } from '@/lib/airports';
 import { haversineKm } from '@/lib/geo';
 import { getGameDb } from '@/lib/db/client';
 import * as schema from '@/lib/db/schema';
-import { PLANE_TYPES } from './catalog';
+import { catalogEntries, FUEL_PRICE_PER_L, PLANE_TYPES, SELL_FRACTION, type CatalogEntry } from './catalog';
 import { fuelAt, progressAt, positionAt } from '@/lib/sim/movement';
 
 // Read-only game-state snapshot for client polling (GET /api/state).
@@ -43,6 +43,11 @@ export interface StateSnapshot {
   simState: { clockMs: number; timeScale: number; paused: boolean };
   planes: PlaneState[];
   contracts: ContractState[];
+  // Market reference data (v0.10.0) — static per build, sent with every snapshot so
+  // the client can compute buy/sell/refuel previews without a separate endpoint.
+  catalog: CatalogEntry[];
+  fuelPricePerL: number;
+  sellFraction: number;
 }
 
 export async function getStateSnapshot(): Promise<StateSnapshot> {
@@ -84,6 +89,9 @@ export async function getStateSnapshot(): Promise<StateSnapshot> {
   return {
     account: { cash: accountRow.cash, reputation: accountRow.reputation },
     simState: { clockMs: simRow.clockMs, timeScale: simRow.timeScale, paused: simRow.paused },
+    catalog: catalogEntries(),
+    fuelPricePerL: FUEL_PRICE_PER_L,
+    sellFraction: SELL_FRACTION,
     planes: planeRows.map((p) => {
       const live = livePlane(p);
       return {