Fix TopstepX login loop on bundled builds: signalr's dynamic require

@microsoft/signalr does an unconditional require('ws')/require('eventsource')
when constructing a connection; bundled (turbopack) builds throw 'dynamic
usage of require is not supported', which the login chain mislabelled as a
login failure and retried every 60s. Externalize the package and never let
hub setup fail the login — REST polling covers everything the hub does.

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

lib/topstepx-class.ts

@@ -172,7 +172,14 @@ export class TopstepXClient implements PlatformClient {
                 if (this.syncInterval) { clearInterval(this.syncInterval); this.syncInterval = null; }
                 this.syncComplete = false;
 
-                await this.startHub();
+                // Hub failure must never read as a login failure: REST polling
+                // carries every feature (slower), and subscribeAll retries the
+                // hub on each sync tick.
+                try {
+                    await this.startHub();
+                } catch (err) {
+                    console.error('[topstepx] hub setup failed — running on REST polling only', err instanceof Error ? err.message : err);
+                }
 
                 await this.requestSync();
                 this.syncInterval = setInterval(() => void this.requestSync(), 60_000);
@@ -240,6 +247,12 @@ export class TopstepXClient implements PlatformClient {
         }
         this.subscribedAccountIds.clear();
 
+        // signalr's Node path does an unconditional dynamic require('ws') /
+        // require('eventsource') when constructing the connection — bundled
+        // builds throw "dynamic usage of require is not supported" on it, so
+        // the package is listed in next.config serverExternalPackages and any
+        // residual failure here is caught by the caller (REST polling covers
+        // everything the hub does, just slower).
         const hub = new signalR.HubConnectionBuilder()
             .withUrl(USER_HUB, {
                 skipNegotiation: true,