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

[Copilot]

This PR removes the usage of the deprecated Box component and sx prop from the KeybindingHint features stories, replacing them with CSS Modules as part of our migration away from styled-components.

Changes made:

• Replaced Box usage: Removed the Box import and replaced Box elements with simple div elements
• Created CSS Module: Added KeybindingHint.features.stories.module.css with wrapper classes for the OnEmphasis and OnPrimary stories
• Maintained visual consistency: Used CSS variables (var(--bgColor-black), var(--button-primary-bgColor-rest), var(--base-size-16)) to preserve the exact same styling

Before:

<Box sx={{backgroundColor: 'var(--bgColor-black)', p: 3}}>
  <KeybindingHint {...args} />
</Box>

After:

<div className={styles.OnEmphasisWrapper}>
  <KeybindingHint {...args} />
</div>

The CSS Module approach provides better performance and aligns with our architectural direction while maintaining identical visual appearance and behavior.

Fixes #6571.

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