supabase / supabase / 29489211058

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Fix some colors (#47996)

## Context

In the table editor when hovering over a row that has fixed columns, the
wordings could appear like they're overlapping
<img width="339" height="95" alt="image"
src="https://github.com/user-attachments/assets/9de8252c-08fc-4dec-a2f2-21461e47691e"
/>

This is due to the `bg-surface-200` class that gets applied to rows on
hover which use alpha values, hence why it's happening. Opting to use
`bg-200` instead which doesn't have alpha values.

Also small fix for the copy button in `CodeBlock` as well which is
running into the same issue - opting to use a set of colors that doesn't
have alpha values instead.
<img width="127" height="115" alt="image"
src="https://github.com/user-attachments/assets/4d773474-49e0-4c3b-bea1-042ff3102f9c"
/>


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Style**
* Updated table header, row hover, and selected-row background colors
for a more consistent appearance.
* Enhanced the code block copy button’s dark-mode and hover background
styling.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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