Broker sessions rest while nothing needs them

A firm's client used to stay logged in around the clock, renewing on a fixed
timer overnight and at weekends. Now, once a firm has nothing open, nothing
pending and nothing left to trade before its next session for a random
15–45 minutes, its client disconnects and the dashboard shows it Resting.
It logs back in a random 20–50 minutes before the next session opens, at a
check-in every 3–7 Central daytime hours, or at once when trading starts, a
manual leg, copy trade, manual order or AutoBuyer run needs it. Token
renewals fall at random points (Tradovate 15–45 min before expiry, TopstepX
every 45–150 min). Settings → Trading → Rest idle broker sessions
(session_rest) turns it off.

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

types.ts

@@ -174,5 +174,9 @@ export interface FirmState {
     firmId: string;
     firm: string;
     connected: boolean;
+    /** The broker session is logged out while nothing needs it (session rest,
+     *  lib/clients.ts): accounts show as last synced. wakeAt is when it logs
+     *  back in by itself, null when only trading starting will. */
+    resting?: { since: number; wakeAt: number | null };
     accounts: AccountState[];
 }