supabase / supabase / 26490221342

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Reduce z index on row selection header (#46360)

## Context

`RowSelectionHeader` was unnecessarily using a 99 z-index value which
was conflicting with the tooltips, so reducing it down to 2 which should
be all that we need

### Before
<img width="558" height="280" alt="image"
src="https://github.com/user-attachments/assets/362be2df-aca7-4cb9-9bfb-84e77dac06ab"
/>


### After
<img width="374" height="161" alt="image"
src="https://github.com/user-attachments/assets/118c8411-f25c-4513-9cce-2d24dcc71759"
/>


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## Summary by CodeRabbit

* **Style**
* Updated the z-index layering of the selected-rows overlay header
component.

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