Trades: record every firm's trades, not just Vest's, and list them on each

TopstepX and Tradovate report fills, so a trade is built from them, flat
to flat (lib/fill-trades.ts), off the window each sync already reads:
TopstepX's two days of Trade/search, Tradovate's sync snapshot. Neither
says who placed an order, so every order the bot places is noted in
own_orders, and a trade is the bot's when its opening fill's order is
one; its stop or take-profit closing it reads as such. A contract is
written only when the position before its window comes out the same
two passes running, so a fill landing between the position and history
reads can't build the wrong trades.

DXtrade reports positions: its record groups the last two days' filled
orders by position code, with each close's SETTLEMENT and COMMISSION.
The bot's own orders carry af- codes, so nothing is kept locally. Only
accounts with something going on are read, at most every 5 minutes.

The Trades button shows on every firm with a login, and the account
page lists any account's trades.

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

lib/topstep-fees.ts

@@ -61,3 +61,14 @@ export function topstepCommission(root: string | null, size: number): number {
     const perSide = (root !== null ? TOPSTEP_COMMISSION_PER_SIDE[root] : undefined) ?? TOPSTEP_COMMISSION_FALLBACK;
     return Math.round(perSide * Math.abs(size || 0) * 100) / 100;
 }
+
+/** How a contract reads on the dashboard: "CON.F.US.ENQ.Z26" → "NQZ6" (the
+ *  root where it's known, else the product code); anything else as it is. */
+export function topstepxSymbol(contractId: unknown, learned?: ReadonlyMap<string, string>): string {
+    const parts = String(contractId ?? '').split('.');
+    const code = topstepxProductCode(contractId);
+    if (!code) return String(contractId ?? '');
+    const expiry = /^([FGHJKMNQUVXZ])(\d{1,2})$/.exec(parts[4] ?? '');
+    const root = topstepxRoot(contractId, learned) ?? code;
+    return expiry ? `${root}${expiry[1]}${expiry[2].slice(-1)}` : root;
+}