fix(frontend): suppress cross-origin stylesheet security error (#12086)

## Summary
- Adds `ignoreErrors` to the Sentry client configuration
(`instrumentation-client.ts`) to filter out `SecurityError:
CSSStyleSheet.cssRules getter: Not allowed to access cross-origin
stylesheet` errors
- These errors are caused by Sentry Replay (rrweb) attempting to
serialize DOM snapshots that include cross-origin stylesheets (from
browser extensions or CDN-loaded CSS)
- This was reported via Sentry on production, occurring on any page when
logged in

## Changes
- **`frontend/instrumentation-client.ts`**: Added `ignoreErrors: [/Not
allowed to access cross-origin stylesheet/]` to `Sentry.init()` config

## Test plan
- [ ] Verify the error no longer appears in Sentry after deployment
- [ ] Verify Sentry Replay still works correctly for other errors
- [ ] Verify no regressions in error tracking (other errors should still
be captured)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- greptile_comment -->

<h2>Greptile Overview</h2>

<details><summary><h3>Greptile Summary</h3></summary>

Adds error filtering to Sentry client configuration to suppress
cross-origin stylesheet security errors that occur when Sentry Replay
(rrweb) attempts to serialize DOM snapshots containing stylesheets from
browser extensions or CDN-loaded CSS. This prevents noise in Sentry
error logs without affecting the capture of legitimate errors.
</details>


<details><summary><h3>Confidence Score: 5/5</h3></summary>

- This PR is safe to merge with minimal risk
- The change adds a simple error filter to suppress benign cross-origin
stylesheet errors that are caused by Sentry Replay itself. The regex
pattern is specific and only affects client-side error reporting, with
no impact on application functionality or legitimate error capture
- No files require special attention
</details>


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<!-- /greptile_comment -->

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

autogpt_platform/frontend/instrumentation-client.ts

@@ -22,6 +22,11 @@ Sentry.init({
 
   enabled: shouldEnable,
 
+  // Suppress cross-origin stylesheet errors from Sentry Replay (rrweb)
+  // serializing DOM snapshots with cross-origin stylesheets
+  // (e.g., from browser extensions or CDN-loaded CSS)
+  ignoreErrors: [/Not allowed to access cross-origin stylesheet/],
+
   // Add optional integrations for additional features
   integrations: [
     Sentry.captureConsoleIntegration(),