fix(assistant): preserve ordered list numbering across split ol eleme…

…nts (supabase#42521)

### Changes

- Accept `start` prop in `OrderedList` and use it to set `counterReset`
on the `<ol>` element, fixing numbering when Streamdown splits lists
across code blocks
- Add test for the above

### To Verify

Copy/paste the following into the Assistant chat (`Cmd + I` on
dashboard)

~~~
Testing markdown lists with code blocks.

1. Thing 1
```
code
```

2. Thing 2
```
code
```

3. Thing 3
```
code
```
~~~

</p>
</details> 

| Before | After |
|--------|--------|
| <img width="1580" height="628" alt="CleanShot 2026-02-05 at 15 04
14@2x"
src="proxy.php?url=https%3A%2F%2Fwww.github.com%2F%3Ca+href%3D"https://github.com/user-attachments/assets/263be289-4a9a-4a8d-b907-cb62a26389cd">https://github.com/user-attachments/assets/263be289-4a9a-4a8d-b907-cb62a26389cd"
/> | <img width="1426" height="622" alt="CleanShot 2026-02-05 at 15 04
08@2x"
src="proxy.php?url=https%3A%2F%2Fwww.github.com%2F%3Ca+href%3D"https://github.com/user-attachments/assets/6bfb526b-30dc-4bcc-b507-0fa0418d3093">https://github.com/user-attachments/assets/6bfb526b-30dc-4bcc-b507-0fa0418d3093"
/> |

Closes AI-401

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

## Summary by CodeRabbit

* **New Features**
* Ordered lists in the AI Assistant panel now support custom starting
numbers, enabling proper continuation of numbered sequences. This
ensures correct numbering when displaying complex content like code
blocks within lists.

* **Tests**
* Added test coverage for ordered list custom starting number
functionality and style rendering.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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---------

Co-authored-by: Francesco Sansalvadore <[email protected]>

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