Color Gradients: Adjust max-width for color gradient swatch to accommodate reset button size

[yogeshbhutkar]

What, Why & How?

This PR addresses an issue in the Navigation block's Submenu & Overlay Background color setting, where the text label becomes excessively large (in width). As a result, the Reset button overlaps with the text, disrupting the layout and negatively impacting usability. This overlap makes it difficult for users to interact with the controls effectively.

Testing Instructions

1. Navigate to the Navigation block.
2. Provide a Submenu & Overlay Background color.
3. Notice the Submenu & Overlay Background setting's text under Color settings does not overlap with the reset button.

Screenshots

Before	After

Closes: #68625

[yogeshbhutkar]

Alternatively, we can adopt this approach as well:

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: yogeshbhutkar <yogeshbhutkar@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[yogeshbhutkar]

Hi @t-hamano,

Following our discussion here, I've created this PR to address the issue. When you have a moment, I’d appreciate it if you could review it and share your feedback. Thank you!

[Mamaduka]

Thanks, @yogeshbhutkar!

The fix looks good, but I wonder if we should add some space between the label and the "Reset" button. Otherwise, it looks a bit crammed.

[yogeshbhutkar]

Thank you for the review, @Mamaduka! 🙌

The space between the label and the reset button has been increased by 4px. Further expanding the spacing would compress the label, affecting its readability.

[Mamaduka]

Thanks, @yogeshbhutkar!