[Admin Reskin] Comment bubbles' background color still uses the old colors in hover state

[r1k0]

When you inspect the comment bubbles' background color while in the hover/focus state, you can observe that they are still using the old colors.

Steps to Reproduce

1. Head over to the Comments page.
2. Hover the comment bubble and observe the background color (or inspect the bubble in hover state)

Screenshot

I used #3858e9 to set the colors instead of var(--wp-admin-theme-color). This acts as <a> in that they don't change color, no matter the chosen admin color scheme.
If it needs to use the variable instead, let me know, and I will update accordingly.

Trac ticket: https://core.trac.wordpress.org/ticket/64829#ticket

## Use of AI Tools
None

Use #3858e9 instead of #2271b1 for comment count bubble hover and focus

states so they match the Admin Reskin. Aligns with link color behavior.

Ticket track - https://core.trac.wordpress.org/ticket/64829

Duplicate of #11207

[mukesh27]

Hi there!

Thanks for the ticket and PR!

What is reason behind choosing this color? Have you go though any design mock?

[r1k0]

I chose the color because it aligns with the existing WordPress admin default (Modern) color palette and it maintains consistency with other UI elements (see screenshot below).

This change was broadly based on ​WordPress design system and reflects the current WordPress admin design patterns as a whole.

[SergeyBiryukov]

In 61869:

Admin Reskin: Correct background color for comment count bubbles.

Props r1k0, mukesh27, manishxdp.
Fixes #64829.