Fix ProfileCard demo props leaking into usage examples

[Copilot]

The ProfileCard demo's internal state props (showIcon, showBehindGlow, customInnerGradient) were being injected into the generated usage code when users modified demo controls, causing compilation errors.

Changes

• Added demoOnlyProps to ComponentPropsProvider to exclude demo-specific state from usage examples
• Added computedProps to map demo state to actual component props:
  • showIcon → iconUrl (conditional URL)
  • showBehindGlow → behindGlowEnabled
  • customInnerGradient → innerGradient

The CodeExample component already supports filtering demo-only props via the demoOnlyProps array—ProfileCardDemo was simply not configured to use it.

<ComponentPropsProvider
  props={props}
  defaultProps={DEFAULT_PROPS}
  resetProps={resetProps}
  hasChanges={hasChanges}
  demoOnlyProps={['showIcon', 'showBehindGlow', 'customInnerGradient']}
  computedProps={computedProps}
>

Users can now interact with demo controls without invalid props appearing in the generated usage code.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[BUG]: components/profile-card</issue_title>
<issue_description>### Describe the issue

Your generated code is producing the props which don't exist:
showIcon
showBehindGlow
customInnerGradient

I presume others, like me, may run into compilation issues when their component definition has undefined props

Reproduction Link

No response

Steps to reproduce

nav to: https://reactbits.dev/components/profile-card
click on "code" button.
Usage has aforementioned options which are not in your props section of your preview tab.

Validations

• I have checked other issues to see if my issue was already reported or addressed</issue_description>

<agent_instructions>make sure to check the demo file and all 4 variants of the profile-card to ensure this is cleaned up.

/content, /tailwind, /ts-default, /ts-tailwind</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [BUG]: components/profile-card #867

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