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

[Copilot]

This PR migrates the Dialog features stories away from styled-components usage as part of the broader effort to remove styled-components from the codebase for performance improvements.

Changes Made

Replaced styled-components with CSS Modules

• Created Dialog.features.stories.module.css with CSS classes using proper CSS variables for theming
• Replaced all Box components with standard HTML div elements
• Replaced all Text components with sx props with standard HTML p elements
• Converted all sx prop usage to className props referencing CSS module classes

Maintained Visual Consistency

The migration preserves the exact visual appearance by mapping styled-components theme values to their corresponding CSS variables:

• accent.subtle → var(--bgColor-accent-muted)
• danger.subtle → var(--bgColor-danger-muted)
• attention.subtle → var(--bgColor-attention-muted)
• Typography styles → var(--text-body-size-small)
• Layout styles → CSS flexbox with proper gap values using var(--base-size-*)

Key Story Updates

• CustomHeader: Replaced Box bg="accent.subtle" with div className={classes.CustomHeaderBg}
• CustomBody: Wrapped Dialog.Body content in a div with danger background styling
• CustomFooter: Wrapped Dialog.Footer content in a div with attention background styling
• Layout containers: Replaced all flex layout Box components with semantic div elements
• Text content: Converted all Text components to standard p elements

All functionality remains identical while completely removing styled-components dependencies from the story file.

Fixes #6409.

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