fix(testing): sync shared tool-tester mock headers with new defaults

createMockHeaders in the shared @sim/testing tool-tester builder still
hardcoded the old Chrome UA / Referer / Sec-Ch-Ua fallback values. It was
unreachable in current tests but would silently diverge from production
getDefaultHeaders() for any future test hitting its fallback path.

Author: waleedlatif1

apps/sim/tools/http/utils.ts

@@ -4,10 +4,11 @@ import type { TableRow } from '@/tools/types'
 /**
  * Creates a set of default headers used in HTTP requests.
  *
- * Identifies as Sim rather than impersonating a browser — browser-fingerprint
+ * Identifies as Sim rather than impersonating a browser. Browser-fingerprint
  * headers (Referer, Sec-Ch-Ua*) trip anti-CSRF/bot-defense heuristics on
- * providers like Atlassian, which explicitly reject REST calls carrying a
- * browser User-Agent. See https://support.atlassian.com/jira/kb/rest-api-calls-with-a-browser-user-agent-header-may-fail-csrf-checks/
+ * providers like Atlassian, which reject REST calls carrying a browser
+ * User-Agent regardless of X-Atlassian-Token. See
+ * https://support.atlassian.com/jira/kb/rest-api-calls-with-a-browser-user-agent-header-may-fail-csrf-checks/
  * @param customHeaders Additional user-provided headers to include
  * @param url Target URL for the request (used for setting Host header)
  * @returns Record of HTTP headers

packages/testing/src/builders/tool-tester.builder.ts

@@ -43,16 +43,11 @@ export interface ToolResponse {
  */
 const createMockHeaders = (customHeaders: Record<string, string> = {}) => {
   return {
-    'User-Agent':
-      'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36',
+    'User-Agent': 'Sim/1.0 (+https://sim.ai)',
     Accept: '*/*',
     'Accept-Encoding': 'gzip, deflate, br',
     'Cache-Control': 'no-cache',
     Connection: 'keep-alive',
-    Referer: 'https://www.sim.ai',
-    'Sec-Ch-Ua': 'Chromium;v=91, Not-A.Brand;v=99',
-    'Sec-Ch-Ua-Mobile': '?0',
-    'Sec-Ch-Ua-Platform': '"macOS"',
     ...customHeaders,
   }
 }