fix(styled): defer default document access for server rendering

[YashAnand69]

Proposed changes (including videos or screenshots)

Allow @rocket.chat/styled to be imported in Node so its existing server-rendering path can emit styles and markup.

The default OwnerDocument context currently evaluates window.document at import time. Resolve that default through a getter instead; browser access and explicitly provided documents retain the same Document type.

Issue(s)

Closes #2257

Further comments

• Before the fix, the Node regression suite fails at import with window is not defined.
• After the fix: full styled suite passes (2 suites, 5 tests), covering server markup/CSS, filtered props/class names, browser defaults, and a separate document provider.
• Package lint, formatting, TypeScript and diff checks pass. Patch changeset included.
• This fixes the styled package entry point; it does not claim that every Fuselage component supports SSR. Reading the default browser document itself still requires a browser. No styling rule or visual change.

AI assistance: implemented and tested with OpenAI Codex.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5696868

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

This PR includes changesets to release 1 package

Name	Type
@rocket.chat/styled	Patch

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