Several unthemed elements on automation creation pages

[mrand]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Some of the elements don't seem to be themable, including a pulldown (see below).

Describe the behavior you expected

Elements able to be themed.

Steps to reproduce the issue

• The "X" to close the "add action" pop-up (this problem also appears elsewhere), as well as the "Blocks" text in the items-title:

• The action pulldown for device isn't themed, including when hovering over it. Edited to add: same thing for the "new blueprint to use" pulldown.

What version of Home Assistant Core has the issue?

2025.12.4

What was the last working version of Home Assistant Core?

2025.12.4

In which browser are you experiencing the issue?

Chrome 109.0.5414.120

Which operating system are you using to run this browser?

Windows 7

State of relevant entities

Problem-relevant frontend configuration

JavaScript errors shown in your browser console/inspector

Additional information

I took a stab at the "Blocks" text with PR #28791, but apparently that's not the correct way to do it.