Fiddle: small fixes

[krishan711]

Description

Screenshots:

Checklist:

• I have updated the CHANGELOG with a summary of my changes
• I have updated the documentation accordingly

[Copilot]

Pull request overview

This PR makes a few small behavioral and packaging tweaks, including a wrapper style adjustment, exposing an additional SCSS entrypoint, and removing a beta deployment workflow.

Changes:

• Remove overflow: auto styling from ContainingView.
• Export a new ./mixins.scss entry from package.json.
• Delete the GitHub Actions workflow that deployed on beta-* branches.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/wrappers/containingView/component.tsx	Removes overflow: auto from ContainingView wrapper styling.
package.json	Adds an export for ./mixins.scss to allow consuming Sass mixins directly.
.github/workflows/deploy-beta.yml	Removes the beta branch deployment/publish workflow.

Comments suppressed due to low confidence (1)

.github/workflows/deploy-beta.yml:1

• This PR deletes the entire deploy-beta.yml workflow, which previously published "next" packages on pushes to beta-* branches. If beta branch publishing is still part of the release process, consider migrating that trigger/job into an existing workflow (e.g. deploy.yml) or documenting the intentional removal in the PR description so it’s clear this operational behavior is being removed.