Missing vertical spacing between global filter and table when `showGlobalFilter` is used without `renderTopToolbarCustomActions`

[nebu-ne]

mantine-react-table version

Version 2.0.0-beta.9

react & react-dom versions

19.1.1

Describe the bug and the steps to reproduce it

• When a table uses showGlobalFilter: true in initialState but does not define renderTopToolbarCustomActions, there is no vertical spacing between the search input and the table body.

• The top toolbar container conditionally applies position: relative !important only when renderTopToolbarCustomActions renders content. When undefined or empty, the container defaults to position: absolute, which causes the vertical padding to collapse.

• Observed in 2.0.0-beta.9 and note that it may affect other versions as well

Minimal, Reproducible Example - (Optional, but Recommended)

1. Create a table with showGlobalFilter: true in initialState
2. Do NOT define renderTopToolbarCustomActions
3. Observe missing vertical spacing between search input and table

Code example:

<MantineReactTable
  columns={columns}
  data={data}
  initialState={{
    showGlobalFilter: true
  }}
  // No renderTopToolbarCustomActions defined
/>


### Screenshots or Videos (Optional)

_No response_

### Do you intend to try to help solve this bug with your own PR?

None

### Terms

- [x] I understand that if my bug cannot be reliably reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.