<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#48542
## Description
The `QueryClient` was created with `new QueryClient()` and no default
options, so every query inherited React Query's default
`refetchOnWindowFocus: true`. On pages like `/policies` and `/users`,
queries are refetched every time the browser window regains focus. Those
focus refetches re-rendered the table with fresh data, tripping
react-table's `autoResetSelectedRows` and `autoResetPage` (both default
`true`), so the table appeared to "reload," clearing the user's row
selection and jumping back to the first page when they clicked away and
back.
## Screen recording demonstrating the fix
https://github.com/user-attachments/assets/eabf30a5-65d3-420d-a8d3-5a529fa06089
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
## Testing
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Prevented users and policies tables from unexpectedly reloading when
switching back to the browser window.
* Preserved table state such as selected rows and current pagination
instead of resetting to the first page.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Rahul Raghunathan
9f8caea025