[Admin reskin] Inconsistent hover vs focus styles on submenu items

[juanfra]

Submenu items in the admin sidebar now show a 2px border radius on keyboard focus, while hover still shows the sharp left line.

Previously both hover and focus matched with sharp borders. The focus state is picking up the generic 2px border-radius from a ​styles in common.css. It should match the sharp hover styling like it did before the reskin.

Steps to reproduce:

To reproduce:

1. Go to admin.
2. Start tabbing to a submenu, confirm the focus styles have a rounded border.
3. Hover the same submenu, confirm the styles are right (sharp left line).

[juanfra]

Submenu focus styles with border radius.

[juanfra]

FWIW, it's not only happening to submenus but also first level menus.

Core trac: https://core.trac.wordpress.org/ticket/64860

### Test
Before :

After :

[khushi1501]

Tested this locally on WordPress 7.0 Beta 5.

I was able to reproduce the issue where the hover and focus styles on admin submenu items appear inconsistent. After applying the patch, the hover and focus states look consistent.

Before applying the patch:-
​https://www.awesomescreenshot.com/image/59293441?key=863f5089e4d25771635c01a6a38c7e53

After applying the patch:-
​https://www.awesomescreenshot.com/image/59293465?key=1ecf479533e4fca0768fb69e56b2810d

[noruzzaman]

Test Report

Patch tested: ​https://github.com/WordPress/wordpress-develop/pull/11262

Environment

• WordPress: 7.0-beta5-20260316.045922
• PHP: 7.4.33
• Server: PHP.wasm
• Database: WP_SQLite_Driver (Server: 8.0.38 / Client: 3.51.0)
• Browser: Chrome 146.0.0.0
• OS: Windows 10/11
• Theme: Twenty Twenty-Five 1.4
• MU Plugins: None activated
• Plugins:
  • Test Reports 1.2.1

Actual Results

1. ✅ Issue resolved with patch.

Before	After

First Level Menu:

Before	After

Sub Menu:

Before	After

[joedolson]

In 62108:

Admin: Remove border radius on focus state in admin sidebar.

Match the :hover and :focus states in the admin sidebar, restoring the sharp-edged border used prior to the admin reskin. Remove the 2px border radius from focused admin sidebar links.

Props juanfra, audrasjb, niravsherasiya7707, khushi1501, shailu25, joedolson.
Fixes #64860.

[juanfra]

Thank you all!