Count CME holiday sessions as one combined trading day when the type opts in

Account types with the catalog's new combineCmeHolidays flag are read
through a combined-day view: holiday-session P&L entries fold into the
next full trading day (computed from the federal-holiday rules, so any
year works), the day count matches how the firm records it (Apex: Sun/
Mon/Tue around a Monday holiday is ONE day), and on the later sessions
of the stretch the earlier sessions' booked P&L carries into realized —
so day targets, already-traded gates, target-hit status and the panel's
day P&L all treat the stretch as a single day. Off by default; older
masters that don't send the flag behave exactly as before.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/api/accounts/[id]/daily-pnl/route.ts

@@ -1,5 +1,7 @@
 import { NextResponse } from 'next/server';
 import { getClients } from '@/lib/clients';
+import { getAccountConfig } from '@/lib/account-type-resolver';
+import { combineCmeSessions, currentTradeDateCT } from '@/lib/trading-logic';
 
 export async function GET(_req: Request, { params }: { params: Promise<{ id: string }> }) {
     const { id } = await params;
@@ -9,7 +11,10 @@ export async function GET(_req: Request, { params }: { params: Promise<{ id: str
     for (const client of clients.values()) {
         const daily = client.dailyPnL?.[accountId];
         if (daily !== undefined) {
-            return NextResponse.json(daily);
+            // Serve the same combined-day view the rest of the app computes
+            // with, so a combining firm's holiday stretch shows as one row.
+            const combine = getAccountConfig(accountId).accountType?.combineCmeHolidays === true;
+            return NextResponse.json(combineCmeSessions(combine, daily, currentTradeDateCT(), 0).dailyPnL);
         }
     }