Update Hidden.features.stories.tsx to no longer use styled-components

[Copilot]

This PR removes the usage of styled-components from the Hidden component's feature stories as part of the ongoing migration away from styled-components.

Changes Made

• Removed Box import from the story file
• Replaced <Box> wrapper elements with plain <div> elements in both stories:
  • HideContent story
  • RenderContentResponsively story

Why This Change

The Box component is deprecated and uses styled-components internally. Since these stories were only using Box as simple container elements without any specific styling, they can be safely replaced with plain HTML div elements.

Testing

• ✅ Stories render correctly in Storybook
• ✅ All linting and formatting checks pass
• ✅ Build completes successfully
• ✅ No visual or functional changes to the stories

The stories continue to function exactly as before, demonstrating the Hidden component's responsive behavior, but now without any dependency on styled-components.

Fixes #6573.

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Latest commit: 6391615

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