Platform-plan organisations and teams can now customise non-embed
signing pages with six brand colour tokens, a border-radius, and
a free-text custom CSS block (up to 256 KB).
- Stored on OrganisationGlobalSettings / TeamGlobalSettings;
teams inherit from the org via brandingEnabled === null.
- CSS is sanitised on save (PostCSS) so we can inline it at SSR
with no per-render parsing.
- Rendered via a nonce'd <style> scoped under .documenso-branded,
using native CSS nesting so user selectors don't need scoping.
- Gated on the existing embedSigningWhiteLabel claim (or
self-hosted) — reuses the embed white-label decision.
## Description
Add envelopes V2 embedded support
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Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>