fix(fuselage): Select's hidden select causing a layout shift

[ricardogarim]

Proposed changes (including videos or screenshots)

Wrap HiddenSelect in a positioned Box inside SelectAria, so its absolute positioning no longer escapes to upstream ancestors and inflates their scroll height.

Why

react-aria's HiddenSelect is a 1×1 px position: absolute element (used for browser autofill and native form submission). In #1939 it was moved out of SelectTrigger to fix an a11y violation, leaving it with no nearby positioned ancestor. Its position now resolves against the next positioned element upstream — typically the OverlayScrollbars viewport hundreds of pixels above — anchoring the 1×1 element deep inside that viewport's coordinate space and inflating its scrollHeight.

On Rocket.Chat admin pages (Accounts, OAuth, Layout), with many Selects inside collapsed Accordion panels, this surfaces as ~2100px of blank scroll below the content.

Fix

Wrap HiddenSelect in <Box position='relative' size={0}> inside SelectAria. SelectTrigger and Popover are untouched.

Steps to reproduce

1. Log in as admin
2. Open /admin/settings/Accounts
3. Scroll to the end

Actual: ~2100px blank area below the last setting.
Expected: Scroll ends at the last item.

Issue(s)

CORE-2202. Regression from #1939.

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Latest commit: ebbe6ba

The changes in this PR will be included in the next version bump.

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Name	Type
@rocket.chat/fuselage	Patch

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