## Problem
Sentry:
[PHP-LARAVEL-1X](https://whisper-money.sentry.io/issues/PHP-LARAVEL-1X)
— 6 events, 2 users.
`IndexaCapitalClient::getPerformance()` throws `RequestException` when
Indexa Capital returns 404 (HTML page) for an account without
performance data — e.g. brand-new or inactive accounts. This aborts
`SyncBankingConnectionJob::syncIndexaCapital` and pages us via Sentry.
## Fix
Catch the 404 inside the client, log at info level, and return an empty
array. The downstream `IndexaCapitalBalanceSyncService` already
short-circuits when `portfolios` is empty, so the sync no-ops cleanly.
Other HTTP errors (auth, 5xx) keep throwing.
## Test
Added `returns empty performance when indexa capital responds 404` in
`IndexaCapitalBalanceSyncTest`.
```
php artisan test --filter=IndexaCapitalBalanceSyncTest
Tests: 12 passed
```
Fixes PHP-LARAVEL-1X
06e7eed4e2