Raise ApiClient default timeout to 30s

The upstream /schedule endpoint regularly returns 7MB+ payloads and
takes 6-10s to complete. The 5s default was aborting those fetches
mid-body, cascading into a retry loop that showed ERR_ABORTED in
DevTools and 'Failed to load data' on the UI — even though the backend
eventually answered with HTTP 200. Matches Angular's default.

src/shared/api/client.ts

@@ -36,7 +36,11 @@ export class ApiClient {
     this.locale = options.locale;
     this.traceId = options.traceId;
     this.fetchFn = options.fetchImpl ?? globalThis.fetch.bind(globalThis);
-    this.timeoutMs = options.defaultTimeoutMs ?? 5000;
+    // Upstream schedule endpoint regularly returns 7MB+ payloads over
+    // a slow WAF-protected connection and can take 8–10 seconds in
+    // dev. 5s was far too aggressive — the fetch would abort mid-body
+    // and cascade into retry loops. 30s matches Angular's default.
+    this.timeoutMs = options.defaultTimeoutMs ?? 30_000;
     this.maxRetries = options.retry?.maxRetries ?? 3;
     this.timeoutFactor = options.retry?.timeoutFactor ?? 2;
     this.retryStatusCodes = new Set(