### Is this a regression? - [ ] Yes, this behavior used to work in the previous version ### The previous version in which this bug was not present was _No response_ ### Description Hello! As you can see from the dev console **color** and **background-color** has no default value. The circle is in this case invisible.  Thanks Team! ### Reproduction Steps to reproduce: 1. Open dev console and inspect **.mat-step-icon-state-done** 2. See that color and bg is undefined. ### Expected Behavior background-color and color should have a default value ### Actual Behavior no default value ### Environment - Angular: 19.2.11 - CDK/Material: 19.2.11 - Browser(s): Chrome, latest. - Operating System (e.g. Windows, macOS, Ubuntu): Windows