fix: improve form accessibility by associating labels with inputs

[niketchandivade]

Summary

This PR improves the accessibility of the with-apivideo-upload example by associating form labels with their corresponding form controls using the htmlFor attribute.

Changes

• Added htmlFor="link" to the "Play button color" label.
• Added htmlFor="linkHover" to the "Buttons hover color" label.
• Added an id to the "Hide controls" checkbox and associated its label using htmlFor.

Why

Associating labels with their corresponding form controls improves accessibility by:

• Allowing screen readers to correctly announce form labels.
• Enabling users to focus or toggle controls by clicking their labels.
• Following HTML and WCAG best practices for accessible forms.

Before

• Labels were visually displayed but were not programmatically associated with their respective inputs.

After

• Each label is associated with its corresponding form control via htmlFor and id, improving accessibility without changing functionality.

Testing

• Verified that clicking each label focuses or toggles the associated control.
• No visual changes.