supabase / supabase / 27553259291

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feat(timezone-picker): pin UTC as second option FE-3570 (#46934)

## Problem

UTC was buried in the middle of the timezone list. Users managing
servers (which run in UTC) had to scroll or search to find it.

## Fix

Hardcode a UTC entry immediately after "Auto detect" so the two most
common choices are always at the top. The entry uses the standard `UTC`
IANA name and shows the checkmark when selected, consistent with all
other entries.

## How to test

- Open any page in Studio and click your user avatar.
- Open the Timezone submenu.
- Confirm the order is: Auto detect, (UTC) Coordinated Universal Time,
then the rest of the list.
- Select UTC and confirm the checkmark appears and the trigger label
updates.
- Search "UTC" in the search box and confirm it still matches.

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

## Summary by CodeRabbit

* **New Features**
* Added explicit "UTC (Coordinated Universal Time)" option at the top of
the timezone selector dropdown for easier access.

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

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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