feat: [container] add render prop

[rohanchkrabrty]

Summary

• Container uses useRender and mergeProps, like Flex, so it accepts a render prop, for example render={<main />}. The repo uses render for polymorphism, so this replaces the as prop from [Container] Support ref as prop and add polymorphic as prop #610.
• ref already worked through the props spread. useRender needs it passed explicitly, and a test covers that.
• With render, Container adds no automatic role="region". The rendered element keeps its implicit role, so render={<main />} stays a main landmark. An explicit role still applies.
• Tests cover the render element, the kept implicit role, and the data-slot on the rendered element.
• Docs add a "Custom render" section, the render prop, and rename ariaLabel/ariaLabelledby in props.ts to aria-label/aria-labelledby to match the component.

Closes #610

• I have followed the pull request section of the contributing guide.

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Project	Deployment	Actions	Updated
apsara	Ready	Preview	Sep 29, 2026 9:52am UTC

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📥 Commits

Reviewing files that changed from the base of the PR and between 8bf6f0d and a854470.

📒 Files selected for processing (5)

• apps/www/src/content/docs/components/container/index.mdx
• apps/www/src/content/docs/components/container/props.ts
• packages/raystack/components/container/__tests__/container.test.tsx
• packages/raystack/components/container/__tests__/data-slots.test.tsx
• packages/raystack/components/container/container.tsx

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