Update SelectPanel.playground.stories.tsx to no longer use styled-components

[Copilot]

This PR migrates the SelectPanel.playground.stories.tsx story from using Box with the sx prop to CSS modules, removing the dependency on styled-components for this story.

Changes Made

• Removed Box import and usage with sx prop for color indicators
• Created SelectPanel.playground.stories.module.css with CSS layer and static styles
• Replaced Box component with a div using the CSS module class ColorIndicator
• Updated imports to use named import for clsx and added CSS module import
• Preserved dynamic backgroundColor as inline style for label-specific colors

Technical Details

The color indicator that was previously implemented as:

<Box
  sx={{width: 14, height: 14, borderRadius: '100%'}}
  style={{backgroundColor: `#${label.color}`}}
/>

Is now implemented as:

<div
  className={clsx(classes.ColorIndicator)}
  style={{backgroundColor: `#${label.color}`}}
/>

With corresponding CSS module:

@layer primer.components.select-panel-playground {
  .ColorIndicator {
    width: 14px;
    height: 14px;
    border-radius: 100%;
  }
}

Visual Verification

The story maintains identical visual appearance and functionality. All color indicators render correctly as circular elements with the appropriate label colors.

Fixes #6523.

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